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589 lines
21 KiB
589 lines
21 KiB
// |
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// XRCarouselView.m |
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// |
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// Created by 肖睿 on 16/3/17. |
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// Copyright © 2016年 肖睿. All rights reserved. |
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// |
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#import "XRCarouselView.h" |
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#import <ImageIO/ImageIO.h> |
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#define DEFAULTTIME 5 |
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#define HORMARGIN 10 |
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#define VERMARGIN 5 |
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#define DES_LABEL_H 20 |
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@interface NSTimer (XRTimer) |
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+ (NSTimer *)xr_timerWithTimeInterval:(NSTimeInterval)interval repeats:(BOOL)repeats block:(void (^)(NSTimer *))block; |
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@end |
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@implementation NSTimer (XRTimer) |
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+ (NSTimer *)xr_timerWithTimeInterval:(NSTimeInterval)interval repeats:(BOOL)repeats block:(void (^)(NSTimer *))block { |
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if ([self respondsToSelector:@selector(timerWithTimeInterval:repeats:block:)]) { |
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return [self timerWithTimeInterval:interval repeats:repeats block:block]; |
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} |
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return [self timerWithTimeInterval:interval target:self selector:@selector(timerAction:) userInfo:block repeats:repeats]; |
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} |
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+ (void)timerAction:(NSTimer *)timer { |
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void (^block)(NSTimer *timer) = timer.userInfo; |
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if (block) block(timer); |
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} |
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@end |
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@interface XRCarouselView()<UIScrollViewDelegate> |
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//轮播的图片数组 |
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@property (nonatomic, strong) NSMutableArray *images; |
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//图片描述控件，默认在底部 |
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@property (nonatomic, strong) UILabel *describeLabel; |
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//滚动视图 |
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@property (nonatomic, strong) UIScrollView *scrollView; |
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//分页控件 |
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@property (nonatomic, strong) UIPageControl *pageControl; |
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//当前显示的imageView |
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@property (nonatomic, strong) UIImageView *currImageView; |
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//滚动显示的imageView |
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@property (nonatomic, strong) UIImageView *otherImageView; |
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//当前显示图片的索引 |
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@property (nonatomic, assign) NSInteger currIndex; |
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//将要显示图片的索引 |
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@property (nonatomic, assign) NSInteger nextIndex; |
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//pageControl图片大小 |
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@property (nonatomic, assign) CGSize pageImageSize; |
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//定时器 |
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@property (nonatomic, strong) NSTimer *timer; |
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//任务队列 |
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@property (nonatomic, strong) NSOperationQueue *queue; |
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@end |
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static NSString *cache; |
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@implementation XRCarouselView |
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#pragma mark- 初始化方法 |
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//创建用来缓存图片的文件夹 |
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+ (void)initialize { |
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cache = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"XRCarousel"]; |
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BOOL isDir = NO; |
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BOOL isExists = [[NSFileManager defaultManager] fileExistsAtPath:cache isDirectory:&isDir]; |
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if (!isExists || !isDir) { |
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[[NSFileManager defaultManager] createDirectoryAtPath:cache withIntermediateDirectories:YES attributes:nil error:nil]; |
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} |
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} |
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#pragma mark 代码创建 |
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- (instancetype)initWithFrame:(CGRect)frame { |
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if (self = [super initWithFrame:frame]) { |
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[self initSubView]; |
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} |
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return self; |
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} |
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#pragma mark nib创建 |
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- (void)awakeFromNib { |
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[super awakeFromNib]; |
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[self initSubView]; |
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} |
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#pragma mark 初始化控件 |
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- (void)initSubView { |
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self.autoCache = YES; |
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[self addSubview:self.scrollView]; |
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[self addSubview:self.describeLabel]; |
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[self addSubview:self.pageControl]; |
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} |
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#pragma mark- frame相关 |
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- (CGFloat)height { |
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return self.scrollView.frame.size.height; |
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} |
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- (CGFloat)width { |
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return self.scrollView.frame.size.width; |
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} |
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#pragma mark- 懒加载 |
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- (NSOperationQueue *)queue { |
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if (!_queue) { |
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_queue = [[NSOperationQueue alloc] init]; |
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} |
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return _queue; |
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} |
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- (UIScrollView *)scrollView { |
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if (!_scrollView) { |
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_scrollView = [[UIScrollView alloc] init]; |
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_scrollView.scrollsToTop = NO; |
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_scrollView.pagingEnabled = YES; |
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_scrollView.bounces = NO; |
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_scrollView.showsHorizontalScrollIndicator = NO; |
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_scrollView.showsVerticalScrollIndicator = NO; |
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_scrollView.delegate = self; |
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//添加手势监听图片的点击 |
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[_scrollView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageClick)]]; |
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_currImageView = [[UIImageView alloc] init]; |
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_currImageView.clipsToBounds = YES; |
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[_scrollView addSubview:_currImageView]; |
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_otherImageView = [[UIImageView alloc] init]; |
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_otherImageView.clipsToBounds = YES; |
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[_scrollView addSubview:_otherImageView]; |
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} |
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return _scrollView; |
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} |
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- (UILabel *)describeLabel { |
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if (!_describeLabel) { |
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_describeLabel = [[UILabel alloc] init]; |
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_describeLabel.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5]; |
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_describeLabel.textColor = [UIColor whiteColor]; |
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_describeLabel.textAlignment = NSTextAlignmentCenter; |
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_describeLabel.font = [UIFont systemFontOfSize:13]; |
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_describeLabel.hidden = YES; |
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} |
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return _describeLabel; |
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} |
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- (UIPageControl *)pageControl { |
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if (!_pageControl) { |
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_pageControl = [[UIPageControl alloc] init]; |
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_pageControl.userInteractionEnabled = NO; |
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} |
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return _pageControl; |
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} |
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#pragma mark- --------设置相关方法-------- |
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#pragma mark 设置图片的内容模式 |
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- (void)setContentMode:(UIViewContentMode)contentMode { |
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_contentMode = contentMode; |
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_currImageView.contentMode = contentMode; |
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_otherImageView.contentMode = contentMode; |
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} |
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#pragma mark 设置图片数组 |
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- (void)setImageArray:(NSArray *)imageArray{ |
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if (!imageArray.count) return; |
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_imageArray = imageArray; |
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_images = [NSMutableArray array]; |
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for (int i = 0; i < imageArray.count; i++) { |
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if ([imageArray[i] isKindOfClass:[UIImage class]]) { |
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[_images addObject:imageArray[i]]; |
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} else if ([imageArray[i] isKindOfClass:[NSString class]]){ |
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//如果是网络图片，则先添加占位图片，下载完成后替换 |
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if (_placeholderImage) [_images addObject:_placeholderImage]; |
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else [_images addObject:[UIImage imageNamed:@"XRPlaceholder"]]; |
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[self downloadImages:i]; |
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} |
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} |
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//防止在滚动过程中重新给imageArray赋值时报错 |
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if (_currIndex >= _images.count) _currIndex = _images.count - 1; |
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self.currImageView.image = _images[_currIndex]; |
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self.describeLabel.text = _describeArray[_currIndex]; |
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self.pageControl.numberOfPages = _images.count; |
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[self layoutSubviews]; |
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} |
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#pragma mark 设置描述数组 |
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- (void)setDescribeArray:(NSArray *)describeArray{ |
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_describeArray = describeArray; |
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if (!describeArray.count) { |
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_describeArray = nil; |
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self.describeLabel.hidden = YES; |
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} else { |
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//如果描述的个数与图片个数不一致，则补空字符串 |
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if (describeArray.count < _images.count) { |
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NSMutableArray *describes = [NSMutableArray arrayWithArray:describeArray]; |
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for (NSInteger i = describeArray.count; i < _images.count; i++) { |
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[describes addObject:@""]; |
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} |
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_describeArray = describes; |
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} |
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self.describeLabel.hidden = NO; |
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_describeLabel.text = _describeArray[_currIndex]; |
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} |
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//重新计算pageControl的位置 |
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self.pagePosition = _pagePosition; |
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} |
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#pragma mark 设置scrollView的contentSize |
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- (void)setScrollViewContentSize { |
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if (_images.count > 1) { |
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self.scrollView.contentSize = CGSizeMake(self.width * 5, 0); |
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self.scrollView.contentOffset = CGPointMake(self.width * 2, 0); |
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self.currImageView.frame = CGRectMake(self.width * 2, 0, self.width, self.height); |
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if (_changeMode == ChangeModeFade) { |
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//淡入淡出模式，两个imageView都在同一位置，改变透明度就可以了 |
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_currImageView.frame = CGRectMake(0, 0, self.width, self.height); |
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_otherImageView.frame = self.currImageView.frame; |
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_otherImageView.alpha = 0; |
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[self insertSubview:self.currImageView atIndex:0]; |
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[self insertSubview:self.otherImageView atIndex:1]; |
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} |
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[self startTimer]; |
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} else { |
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//只要一张图片时，scrollview不可滚动，且关闭定时器 |
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self.scrollView.contentSize = CGSizeZero; |
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self.scrollView.contentOffset = CGPointZero; |
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self.currImageView.frame = CGRectMake(0, 0, self.width, self.height); |
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[self stopTimer]; |
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} |
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} |
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#pragma mark 设置图片描述控件 |
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- (void)setDescribeTextColor:(UIColor *)color font:(UIFont *)font bgColor:(UIColor *)bgColor { |
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if (color) self.describeLabel.textColor = color; |
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if (font) self.describeLabel.font = font; |
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if (bgColor) self.describeLabel.backgroundColor = bgColor; |
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} |
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#pragma mark 设置pageControl的指示器图片 |
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- (void)setPageImage:(UIImage *)image andCurrentPageImage:(UIImage *)currentImage { |
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if (!image || !currentImage) return; |
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self.pageImageSize = image.size; |
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[self.pageControl setValue:currentImage forKey:@"_currentPageImage"]; |
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[self.pageControl setValue:image forKey:@"_pageImage"]; |
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} |
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#pragma mark 设置pageControl的指示器颜色 |
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- (void)setPageColor:(UIColor *)color andCurrentPageColor:(UIColor *)currentColor { |
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_pageControl.pageIndicatorTintColor = color; |
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_pageControl.currentPageIndicatorTintColor = currentColor; |
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} |
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#pragma mark 设置pageControl的位置 |
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- (void)setPagePosition:(PageControlPosition)pagePosition { |
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_pagePosition = pagePosition; |
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_pageControl.hidden = (_pagePosition == PositionHide) || (_imageArray.count == 1); |
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if (_pageControl.hidden) return; |
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CGSize size; |
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if (!_pageImageSize.width) {//没有设置图片，系统原有样式 |
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size = [_pageControl sizeForNumberOfPages:_pageControl.numberOfPages]; |
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size.height = 8; |
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} else {//设置图片了 |
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size = CGSizeMake(_pageImageSize.width * (_pageControl.numberOfPages * 2 - 1), _pageImageSize.height); |
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} |
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_pageControl.frame = CGRectMake(0, 0, size.width, size.height); |
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CGFloat centerY = self.height - size.height * 0.5 - VERMARGIN - (_describeLabel.hidden?0: DES_LABEL_H); |
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CGFloat pointY = self.height - size.height - VERMARGIN - (_describeLabel.hidden?0: DES_LABEL_H); |
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if (_pagePosition == PositionDefault || _pagePosition == PositionBottomCenter) |
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_pageControl.center = CGPointMake(self.width * 0.5, centerY); |
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else if (_pagePosition == PositionTopCenter) |
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_pageControl.center = CGPointMake(self.width * 0.5, size.height * 0.5 + VERMARGIN); |
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else if (_pagePosition == PositionBottomLeft) |
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_pageControl.frame = CGRectMake(HORMARGIN, pointY, size.width, size.height); |
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else |
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_pageControl.frame = CGRectMake(self.width - HORMARGIN - size.width, pointY, size.width, size.height); |
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if (!CGPointEqualToPoint(_pageOffset, CGPointZero)) { |
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self.pageOffset = _pageOffset; |
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} |
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} |
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- (void)setPageOffset:(CGPoint)pageOffset { |
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_pageOffset = pageOffset; |
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CGRect frame = _pageControl.frame; |
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frame.origin.x += pageOffset.x; |
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frame.origin.y += pageOffset.y; |
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_pageControl.frame = frame; |
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} |
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#pragma mark 设置定时器时间 |
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- (void)setTime:(NSTimeInterval)time { |
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_time = time; |
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[self startTimer]; |
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} |
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- (void)setChangeMode:(ChangeMode)changeMode { |
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_changeMode = changeMode; |
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if (changeMode == ChangeModeFade) { |
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_gifPlayMode = GifPlayModeAlways; |
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} |
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} |
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#pragma mark 设置gif播放方式 |
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- (void)setGifPlayMode:(GifPlayMode)gifPlayMode { |
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if (_changeMode == ChangeModeFade) return; |
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_gifPlayMode = gifPlayMode; |
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if (gifPlayMode == GifPlayModeAlways) { |
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[self gifAnimating:YES]; |
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} else if (gifPlayMode == GifPlayModeNever) { |
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[self gifAnimating:NO]; |
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} |
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} |
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#pragma mark- --------定时器相关方法-------- |
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- (void)startTimer { |
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//如果只有一张图片，则直接返回，不开启定时器 |
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if (_images.count <= 1) return; |
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//如果定时器已开启，先停止再重新开启 |
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if (self.timer) [self stopTimer]; |
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__weak typeof(self) weakSelf = self; |
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self.timer = [NSTimer xr_timerWithTimeInterval:_time < 1? DEFAULTTIME: _time repeats:YES block:^(NSTimer * _Nonnull timer) { |
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[weakSelf nextPage]; |
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}]; |
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[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes]; |
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} |
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- (void)stopTimer { |
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[self.timer invalidate]; |
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self.timer = nil; |
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} |
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- (void)nextPage { |
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if (_changeMode == ChangeModeFade) { |
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//淡入淡出模式，不需要修改scrollview偏移量，改变两张图片的透明度即可 |
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self.nextIndex = (self.currIndex + 1) % _images.count; |
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self.otherImageView.image = _images[_nextIndex]; |
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[UIView animateWithDuration:1.2 animations:^{ |
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self.currImageView.alpha = 0; |
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self.otherImageView.alpha = 1; |
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self.pageControl.currentPage = _nextIndex; |
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} completion:^(BOOL finished) { |
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[self changeToNext]; |
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}]; |
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} else [self.scrollView setContentOffset:CGPointMake(self.width * 3, 0) animated:YES]; |
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} |
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#pragma mark- -----------其它----------- |
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#pragma mark 布局子控件 |
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- (void)layoutSubviews { |
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[super layoutSubviews]; |
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//有导航控制器时，会默认在scrollview上方添加64的内边距，这里强制设置为0 |
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_scrollView.contentInset = UIEdgeInsetsZero; |
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_scrollView.frame = self.bounds; |
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_describeLabel.frame = CGRectMake(0, self.height - DES_LABEL_H, self.width, DES_LABEL_H); |
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//重新计算pageControl的位置 |
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self.pagePosition = _pagePosition; |
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[self setScrollViewContentSize]; |
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} |
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#pragma mark 图片点击事件 |
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- (void)imageClick { |
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if (self.imageClickBlock) { |
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self.imageClickBlock(self.currIndex); |
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} else if ([_delegate respondsToSelector:@selector(carouselView:clickImageAtIndex:)]){ |
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[_delegate carouselView:self clickImageAtIndex:self.currIndex]; |
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} |
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} |
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#pragma mark 下载网络图片 |
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- (void)downloadImages:(int)index { |
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NSString *urlString = _imageArray[index]; |
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NSString *imageName = [urlString stringByReplacingOccurrencesOfString:@"/" withString:@""]; |
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NSString *path = [cache stringByAppendingPathComponent:imageName]; |
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if (_autoCache) { //如果开启了缓存功能，先从沙盒中取图片 |
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NSData *data = [NSData dataWithContentsOfFile:path]; |
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if (data) { |
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_images[index] = getImageWithData(data); |
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return; |
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} |
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} |
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//下载图片 |
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NSBlockOperation *download = [NSBlockOperation blockOperationWithBlock:^{ |
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NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]]; |
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if (!data) return; |
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UIImage *image = getImageWithData(data); |
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//取到的data有可能不是图片 |
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if (image && index<self.images.count) { // MARK add by lsz 2021-12-15 数组可能越界 （&& index<self.images.count） |
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self.images[index] = image; |
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//如果下载的图片为当前要显示的图片，直接到主线程给imageView赋值，否则要等到下一轮才会显示 |
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if (_currIndex == index) [_currImageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO]; |
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if (_autoCache) [data writeToFile:path atomically:YES]; |
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} |
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}]; |
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[self.queue addOperation:download]; |
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} |
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#pragma mark 下载图片，如果是gif则计算动画时长 |
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UIImage *getImageWithData(NSData *data) { |
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CGImageSourceRef imageSource = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL); |
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size_t count = CGImageSourceGetCount(imageSource); |
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if (count <= 1) { //非gif |
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CFRelease(imageSource); |
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return [[UIImage alloc] initWithData:data]; |
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} else { //gif图片 |
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NSMutableArray *images = [NSMutableArray array]; |
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NSTimeInterval duration = 0; |
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for (size_t i = 0; i < count; i++) { |
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CGImageRef image = CGImageSourceCreateImageAtIndex(imageSource, i, NULL); |
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if (!image) continue; |
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duration += durationWithSourceAtIndex(imageSource, i); |
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[images addObject:[UIImage imageWithCGImage:image]]; |
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CGImageRelease(image); |
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} |
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if (!duration) duration = 0.1 * count; |
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CFRelease(imageSource); |
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return [UIImage animatedImageWithImages:images duration:duration]; |
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} |
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} |
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#pragma mark 获取每一帧图片的时长 |
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float durationWithSourceAtIndex(CGImageSourceRef source, NSUInteger index) { |
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float duration = 0.1f; |
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CFDictionaryRef propertiesRef = CGImageSourceCopyPropertiesAtIndex(source, index, nil); |
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NSDictionary *properties = (__bridge NSDictionary *)propertiesRef; |
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NSDictionary *gifProperties = properties[(NSString *)kCGImagePropertyGIFDictionary]; |
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NSNumber *delayTime = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime]; |
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if (delayTime) duration = delayTime.floatValue; |
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else { |
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delayTime = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime]; |
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if (delayTime) duration = delayTime.floatValue; |
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} |
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CFRelease(propertiesRef); |
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return duration; |
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} |
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#pragma mark 清除沙盒中的图片缓存 |
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+ (void)clearDiskCache { |
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NSArray *contents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:cache error:NULL]; |
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for (NSString *fileName in contents) { |
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[[NSFileManager defaultManager] removeItemAtPath:[cache stringByAppendingPathComponent:fileName] error:nil]; |
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} |
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} |
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#pragma mark 当图片滚动过半时就修改当前页码 |
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- (void)changeCurrentPageWithOffset:(CGFloat)offsetX { |
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if (offsetX < self.width * 1.5) { |
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NSInteger index = self.currIndex - 1; |
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if (index < 0) index = self.images.count - 1; |
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_pageControl.currentPage = index; |
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} else if (offsetX > self.width * 2.5){ |
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_pageControl.currentPage = (self.currIndex + 1) % self.images.count; |
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} else { |
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_pageControl.currentPage = self.currIndex; |
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} |
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} |
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#pragma mark- --------UIScrollViewDelegate-------- |
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView { |
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if (CGSizeEqualToSize(CGSizeZero, scrollView.contentSize)) return; |
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CGFloat offsetX = scrollView.contentOffset.x; |
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if (_gifPlayMode == GifPlayModePauseWhenScroll) { |
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[self gifAnimating:(offsetX == self.width * 2)]; |
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} |
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//滚动过程中改变pageControl的当前页码 |
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[self changeCurrentPageWithOffset:offsetX]; |
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//向右滚动 |
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if (offsetX < self.width * 2) { |
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if (_changeMode == ChangeModeFade) { |
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self.currImageView.alpha = offsetX / self.width - 1; |
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self.otherImageView.alpha = 2 - offsetX / self.width; |
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} else self.otherImageView.frame = CGRectMake(self.width, 0, self.width, self.height); |
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self.nextIndex = self.currIndex - 1; |
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if (self.nextIndex < 0) self.nextIndex = _images.count - 1; |
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self.otherImageView.image = self.images[self.nextIndex]; |
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if (offsetX <= self.width) [self changeToNext]; |
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//向左滚动 |
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} else if (offsetX > self.width * 2){ |
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if (_changeMode == ChangeModeFade) { |
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self.otherImageView.alpha = offsetX / self.width - 2; |
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self.currImageView.alpha = 3 - offsetX / self.width; |
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} else self.otherImageView.frame = CGRectMake(CGRectGetMaxX(_currImageView.frame), 0, self.width, self.height); |
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|
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self.nextIndex = (self.currIndex + 1) % _images.count; |
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self.otherImageView.image = self.images[self.nextIndex]; |
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if (offsetX >= self.width * 3) [self changeToNext]; |
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} |
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} |
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- (void)changeToNext { |
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if (_changeMode == ChangeModeFade) { |
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self.currImageView.alpha = 1; |
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self.otherImageView.alpha = 0; |
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} |
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//切换到下一张图片 |
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self.currImageView.image = self.otherImageView.image; |
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self.scrollView.contentOffset = CGPointMake(self.width * 2, 0); |
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[self.scrollView layoutSubviews]; |
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self.currIndex = self.nextIndex; |
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self.pageControl.currentPage = self.currIndex; |
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self.describeLabel.text = self.describeArray[self.currIndex]; |
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} |
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|
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- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { |
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[self stopTimer]; |
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} |
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- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{ |
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[self startTimer]; |
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} |
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|
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//该方法用来修复滚动过快导致分页异常的bug |
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- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { |
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if (_changeMode == ChangeModeFade) return; |
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CGPoint currPointInSelf = [_scrollView convertPoint:_currImageView.frame.origin toView:self]; |
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if (currPointInSelf.x >= -self.width / 2 && currPointInSelf.x <= self.width / 2) |
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[self.scrollView setContentOffset:CGPointMake(self.width * 2, 0) animated:YES]; |
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else [self changeToNext]; |
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} |
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|
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- (void)gifAnimating:(BOOL)b { |
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[self gifAnimating:b view:self.currImageView]; |
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[self gifAnimating:b view:self.otherImageView]; |
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} |
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|
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- (void)gifAnimating:(BOOL)isPlay view:(UIImageView *)imageV { |
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if (isPlay) { |
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CFTimeInterval pausedTime = [imageV.layer timeOffset]; |
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imageV.layer.speed = 1.0; |
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imageV.layer.timeOffset = 0.0; |
|
imageV.layer.beginTime = 0.0; |
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CFTimeInterval timeSincePause = [imageV.layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime; |
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imageV.layer.beginTime = timeSincePause; |
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} else { |
|
CFTimeInterval pausedTime = [imageV.layer convertTime:CACurrentMediaTime() fromLayer:nil]; |
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imageV.layer.speed = 0.0; |
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imageV.layer.timeOffset = pausedTime; |
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} |
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} |
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@end |
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UIImage *gifImageNamed(NSString *imageName) { |
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|
|
if (![imageName hasSuffix:@".gif"]) { |
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imageName = [imageName stringByAppendingString:@".gif"]; |
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} |
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|
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NSString *imagePath = [[NSBundle mainBundle] pathForResource:imageName ofType:nil]; |
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NSData *data = [NSData dataWithContentsOfFile:imagePath]; |
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if (data) return getImageWithData(data); |
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|
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return [UIImage imageNamed:imageName]; |
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} |
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