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653 lines
23 KiB
653 lines
23 KiB
1 year ago
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// WSLWaterFlowLayout.m
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// zzjk
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//
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// Created by 沙狐 on 2020/6/11.
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// Copyright © 2020 沙狐. All rights reserved.
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//
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#import "WSLWaterFlowLayout.h"
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/** 默认的列数*/
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static const NSInteger WSLDefaultColumeCount = 2;
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/** 默认的行数*/
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static const NSInteger WSLDefaultRowCount = 5;
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/** 每一列之间的间距*/
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static const NSInteger WSLDefaultColumeMargin = 10;
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/** 每一行之间的间距*/
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static const CGFloat WSLDefaultRowMargin = 10;
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/** 边缘之间的间距*/
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static const UIEdgeInsets WSLDefaultEdgeInset = {10, 10, 10, 10};
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///** 每一行之间的间距*/
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//static const CGSize WSLDefaultHeaderSize = CGSizeMake(0, 66);
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///** 每一行之间的间距*/
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//static const CGSize WSLDefaultFooterSize = CGSizeMake(0, 66);
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@interface WSLWaterFlowLayout ()
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/** 存放所有cell的布局属性*/
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@property (strong, nonatomic) NSMutableArray *attrsArray;
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/** 存放每一列的最大y值*/
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@property (nonatomic, strong) NSMutableArray *columnHeights;
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/** 存放每一行的最大x值*/
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@property (nonatomic, strong) NSMutableArray *rowWidths;
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/** 内容的高度*/
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@property (nonatomic, assign) CGFloat maxColumnHeight;
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/** 内容的宽度*/
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@property (nonatomic, assign) CGFloat maxRowWidth;
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/** 列数*/
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-(NSInteger)columnCount;
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/** 行数*/
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-(NSInteger)rowCount;
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/** 每一行之间的间距*/
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-(CGFloat)rowMargin;
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/** 每一列之间的间距*/
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-(CGFloat)columnMargin;
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/** 边缘之间的间距*/
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-(UIEdgeInsets)edgeInsets;
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@end
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@implementation WSLWaterFlowLayout
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#pragma mark item属性配置
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-(CGFloat)columnMargin {
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if ([self.delegate respondsToSelector:@selector(columnMarginInWaterFlowLayout:)]) {
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return [self.delegate columnMarginInWaterFlowLayout:self];
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} else {
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return WSLDefaultColumeMargin;
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}
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}
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-(CGFloat)rowMargin {
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if ([self.delegate respondsToSelector:@selector(rowMarginInWaterFlowLayout:)]) {
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return [self.delegate rowMarginInWaterFlowLayout:self];
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} else {
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return WSLDefaultRowMargin;
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}
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}
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-(NSInteger)columnCount {
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if ([self.delegate respondsToSelector:@selector(columnCountInWaterFlowLayout:)]) {
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return [self.delegate columnCountInWaterFlowLayout:self];
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} else {
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return WSLDefaultColumeCount;
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}
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}
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-(NSInteger)rowCount{
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if ([self.delegate respondsToSelector:@selector(rowCountInWaterFlowLayout:)]) {
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return [self.delegate rowCountInWaterFlowLayout:self];
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} else {
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return WSLDefaultRowCount;
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}
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}
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-(UIEdgeInsets)edgeInsets {
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if ([self.delegate respondsToSelector:@selector(edgeInsetInWaterFlowLayout:)]) {
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return [self.delegate edgeInsetInWaterFlowLayout:self];
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} else {
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return WSLDefaultEdgeInset;
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}
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}
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#pragma mark - 懒加载
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- (NSMutableArray *)columnHeights {
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if (!_columnHeights) {
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_columnHeights = [NSMutableArray array];
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}
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return _columnHeights;
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}
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- (NSMutableArray *)rowWidths {
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if (!_rowWidths) {
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_rowWidths = [NSMutableArray array];
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}
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return _rowWidths;
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}
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-(NSMutableArray *)attrsArray {
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if (_attrsArray == nil) {
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_attrsArray = [NSMutableArray array];
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}
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return _attrsArray;
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}
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#pragma mark - 重写系统方法
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/** 初始化 生成每个视图的布局信息*/
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-(void)prepareLayout {
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[super prepareLayout];
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if (self.flowLayoutStyle == WSLWaterFlowVerticalEqualWidth) {
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//清除以前计算的所有高度
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self.maxColumnHeight = 0;
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[self.columnHeights removeAllObjects];
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for (NSInteger i = 0; i < self.columnCount; i++) {
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[self.columnHeights addObject:@(self.edgeInsets.top)];
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}
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}else if (self.flowLayoutStyle == WSLWaterFlowHorizontalEqualHeight){
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//清除以前计算的所有宽度
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self.maxRowWidth = 0;
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[self.rowWidths removeAllObjects];
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for (NSInteger i = 0; i < self.rowCount; i++) {
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[self.rowWidths addObject:@(self.edgeInsets.left)];
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}
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}else if (self.flowLayoutStyle == WSLWaterFlowVerticalEqualHeight || self.flowLayoutStyle == WSLLineWaterFlow){
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//记录最后一个的内容的横坐标和纵坐标
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self.maxColumnHeight = 0;
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[self.columnHeights removeAllObjects];
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[self.columnHeights addObject:@(self.edgeInsets.top)];
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self.maxRowWidth = 0;
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[self.rowWidths removeAllObjects];
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[self.rowWidths addObject:@(self.edgeInsets.left)];
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}else if(self.flowLayoutStyle == WSLWaterFlowHorizontalGrid){
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//记录最后一个的内容的横坐标和纵坐标
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self.maxColumnHeight = 0;
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self.maxRowWidth = 0;
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[self.rowWidths removeAllObjects];
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for (NSInteger i = 0; i < 2; i++) {
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[self.rowWidths addObject:@(self.edgeInsets.left)];
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}
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}
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//清除之前数组
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[self.attrsArray removeAllObjects];
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//开始创建每一组cell的布局属性
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NSInteger sectionCount = [self.collectionView numberOfSections];
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for(NSInteger section = 0; section < sectionCount; section++){
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//获取每一组头视图header的UICollectionViewLayoutAttributes
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if([self.delegate respondsToSelector:@selector(waterFlowLayout:sizeForHeaderViewInSection:)]){
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UICollectionViewLayoutAttributes *headerAttrs = [self layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionHeader atIndexPath:[NSIndexPath indexPathForItem:0 inSection:section]];
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[self.attrsArray addObject:headerAttrs];
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}
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//开始创建组内的每一个cell的布局属性
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NSInteger rowCount = [self.collectionView numberOfItemsInSection:section];
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for (NSInteger row = 0; row < rowCount; row++) {
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//创建位置
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NSIndexPath *indexPath = [NSIndexPath indexPathForItem:row inSection:section];
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//获取indexPath位置cell对应的布局属性
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UICollectionViewLayoutAttributes *attrs = [self layoutAttributesForItemAtIndexPath:indexPath];
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[self.attrsArray addObject:attrs];
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}
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//获取每一组脚视图footer的UICollectionViewLayoutAttributes
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if([self.delegate respondsToSelector:@selector(waterFlowLayout:sizeForFooterViewInSection:)]){
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UICollectionViewLayoutAttributes *footerAttrs = [self layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionFooter atIndexPath:[NSIndexPath indexPathForItem:0 inSection:section]];
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[self.attrsArray addObject:footerAttrs];
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}
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}
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}
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/** 决定一段区域所有cell和头尾视图的布局属性*/
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-(NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect {
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return self.attrsArray;
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}
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/** 返回indexPath位置cell对应的布局属性*/
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-(UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath {
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//设置布局属性
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UICollectionViewLayoutAttributes *attrs = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];
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if (self.flowLayoutStyle == WSLWaterFlowVerticalEqualWidth) {
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attrs.frame = [self itemFrameOfVerticalWaterFlow:indexPath];
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}else if (self.flowLayoutStyle == WSLWaterFlowHorizontalEqualHeight){
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attrs.frame = [self itemFrameOfHorizontalWaterFlow:indexPath];
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}else if(self.flowLayoutStyle == WSLWaterFlowVerticalEqualHeight){
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attrs.frame = [self itemFrameOfVHWaterFlow:indexPath];
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}else if(self.flowLayoutStyle == WSLLineWaterFlow){
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attrs.frame = [self itemFrameOfLineWaterFlow:indexPath];
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// 计算中心点距离
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CGFloat delta = fabs((attrs.center.x - self.collectionView.contentOffset.x) - self.collectionView.frame.size.width * 0.5);
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//计算比例
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CGFloat scale = 1 - delta / (self.collectionView.frame.size.width * 0.5) * 0.25;
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attrs.transform = CGAffineTransformMakeScale(scale, scale);
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}else if (self.flowLayoutStyle == WSLWaterFlowHorizontalGrid){
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attrs.frame = [self itemFrameOfHorizontalGridWaterFlow:indexPath];
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}
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return attrs;
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}
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/** 返回indexPath位置头和脚视图对应的布局属性*/
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- (UICollectionViewLayoutAttributes *)layoutAttributesForSupplementaryViewOfKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath{
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UICollectionViewLayoutAttributes *attri;
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if ([UICollectionElementKindSectionHeader isEqualToString:elementKind]) {
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//头视图
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attri = [UICollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionHeader withIndexPath:indexPath];
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attri.frame = [self headerViewFrameOfVerticalWaterFlow:indexPath];
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}else {
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//脚视图
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attri = [UICollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionFooter withIndexPath:indexPath];
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attri.frame = [self footerViewFrameOfVerticalWaterFlow:indexPath];
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}
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return attri;
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}
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/** 返回值决定了collectionView停止滚动时的偏移量 手指松开后执行
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* proposedContentOffset：原本情况下，collectionView停止滚动时最终的偏移量
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* velocity 滚动速率，通过这个参数可以了解滚动的方向
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*/
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/*
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- (CGPoint)targetContentOffsetForProposedContentOffset:(CGPoint)proposedContentOffset withScrollingVelocity:(CGPoint)velocity
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{
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if (self.flowLayoutStyle == WSLLineWaterFlow) {
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// 拖动比较快 最终偏移量 不等于 手指离开时偏移量
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CGFloat collectionW = self.collectionView.frame.size.width;
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// 最终偏移量
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CGPoint targetP = [super targetContentOffsetForProposedContentOffset:proposedContentOffset withScrollingVelocity:velocity];
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// 0.获取最终显示的区域
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CGRect targetRect = CGRectMake(targetP.x, 0, collectionW, MAXFLOAT);
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// 1.获取最终显示的cell
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NSArray *attrs = [super layoutAttributesForElementsInRect:targetRect];
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// 获取最小间距
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CGFloat minDelta = MAXFLOAT;
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for (UICollectionViewLayoutAttributes *attr in attrs) {
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// 获取距离中心点距离:注意:应该用最终的x
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CGFloat delta = (attr.center.x - targetP.x) - self.collectionView.bounds.size.width * 0.5;
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if (fabs(delta) < fabs(minDelta)) {
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minDelta = delta;
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}
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}
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// 移动间距
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targetP.x += minDelta;
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if (targetP.x < 0) {
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targetP.x = 0;
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}
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return targetP;
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}
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return proposedContentOffset;
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}
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// Invalidate:刷新
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// 在滚动的时候是否允许刷新布局
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- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds{
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if (self.flowLayoutStyle == WSLLineWaterFlow) {
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return YES;
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}
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return NO;
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}
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*/
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//返回内容高度
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-(CGSize)collectionViewContentSize {
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if (self.flowLayoutStyle == WSLWaterFlowVerticalEqualWidth) {
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return CGSizeMake(0, self.maxColumnHeight + self.edgeInsets.bottom);
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}else if (self.flowLayoutStyle == WSLWaterFlowHorizontalEqualHeight){
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return CGSizeMake(self.maxRowWidth + self.edgeInsets.right, 0);
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}else if(self.flowLayoutStyle == WSLWaterFlowVerticalEqualHeight){
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return CGSizeMake(0 , self.maxColumnHeight + self.edgeInsets.bottom);
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}else if(self.flowLayoutStyle == WSLLineWaterFlow){
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return CGSizeMake(self.maxRowWidth + self.edgeInsets.right , 0);
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}else if(self.flowLayoutStyle == WSLWaterFlowHorizontalGrid){
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return CGSizeMake(self.maxRowWidth + self.edgeInsets.right,self.collectionView.frame.size.height);
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}
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return CGSizeMake(0, 0);
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}
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#pragma mark - Help Methods
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//竖向瀑布流 item等宽不等高
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- (CGRect)itemFrameOfVerticalWaterFlow:(NSIndexPath *)indexPath{
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//collectionView的宽度
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CGFloat collectionW = self.collectionView.frame.size.width;
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//设置布局属性item的frame
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|
|
CGFloat w = (collectionW - self.edgeInsets.left - self.edgeInsets.right - (self.columnCount - 1) * self.columnMargin) / self.columnCount;
|
||
|
|
CGFloat h = [self.delegate waterFlowLayout:self sizeForItemAtIndexPath:indexPath].height;
|
||
|
|
|
||
|
|
//找出高度最短的那一列
|
||
|
|
NSInteger destColumn = 0;
|
||
|
|
CGFloat minColumnHeight = [self.columnHeights[0] doubleValue];
|
||
|
|
for (NSInteger i = 1; i < self.columnCount; i++) {
|
||
|
|
//取出第i列
|
||
|
|
CGFloat columnHeight = [self.columnHeights[i] doubleValue];
|
||
|
|
if (minColumnHeight > columnHeight) {
|
||
|
|
minColumnHeight = columnHeight;
|
||
|
|
destColumn = i;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
CGFloat x = self.edgeInsets.left + destColumn * (w + self.columnMargin);
|
||
|
|
CGFloat y = minColumnHeight;
|
||
|
|
if (y != self.edgeInsets.top) {
|
||
|
|
y += self.rowMargin;
|
||
|
|
}
|
||
|
|
|
||
|
|
//更新最短那列的高度
|
||
|
|
self.columnHeights[destColumn] = @(CGRectGetMaxY(CGRectMake(x, y, w, h)));
|
||
|
|
//记录内容的高度
|
||
|
|
CGFloat columnHeight = [self.columnHeights[destColumn] doubleValue];
|
||
|
|
if (self.maxColumnHeight < columnHeight) {
|
||
|
|
self.maxColumnHeight = columnHeight;
|
||
|
|
}
|
||
|
|
|
||
|
|
return CGRectMake(x, y, w, h);
|
||
|
|
}
|
||
|
|
|
||
|
|
//竖向瀑布流 item等高不等宽
|
||
|
|
- (CGRect)itemFrameOfVHWaterFlow:(NSIndexPath *)indexPath{
|
||
|
|
|
||
|
|
//collectionView的宽度
|
||
|
|
CGFloat collectionW = self.collectionView.frame.size.width;
|
||
|
|
|
||
|
|
CGSize headViewSize = CGSizeMake(0, 0);
|
||
|
|
if([self.delegate respondsToSelector:@selector(waterFlowLayout:sizeForHeaderViewInSection:)]){
|
||
|
|
headViewSize = [self.delegate waterFlowLayout:self sizeForHeaderViewInSection:indexPath.section];
|
||
|
|
}
|
||
|
|
|
||
|
|
CGFloat w = [self.delegate waterFlowLayout:self sizeForItemAtIndexPath:indexPath].width;
|
||
|
|
CGFloat h = [self.delegate waterFlowLayout:self sizeForItemAtIndexPath:indexPath].height;
|
||
|
|
|
||
|
|
CGFloat x;
|
||
|
|
CGFloat y;
|
||
|
|
|
||
|
|
//记录最后一行的内容的横坐标和纵坐标
|
||
|
|
if (collectionW - [[self.rowWidths firstObject] floatValue] > w + self.edgeInsets.right) {
|
||
|
|
|
||
|
|
x = [[self.rowWidths firstObject] floatValue] == self.edgeInsets.left ? self.edgeInsets.left : [[self.rowWidths firstObject] floatValue] + self.columnMargin;
|
||
|
|
if ([[self.columnHeights firstObject] floatValue] == self.edgeInsets.top) {
|
||
|
|
y = self.edgeInsets.top;
|
||
|
|
}else if ([[self.columnHeights firstObject] floatValue] == self.edgeInsets.top + headViewSize.height) {
|
||
|
|
y = self.edgeInsets.top + headViewSize.height + self.rowMargin;
|
||
|
|
}else{
|
||
|
|
y = [[self.columnHeights firstObject] floatValue] - h;
|
||
|
|
}
|
||
|
|
[self.rowWidths replaceObjectAtIndex:0 withObject:@(x + w )];
|
||
|
|
|
||
|
|
if ([[self.columnHeights firstObject] floatValue] == self.edgeInsets.top || [[self.columnHeights firstObject] floatValue] == self.edgeInsets.top + headViewSize.height) {
|
||
|
|
[self.columnHeights replaceObjectAtIndex:0 withObject:@(y + h)];
|
||
|
|
}
|
||
|
|
|
||
|
|
}else if(collectionW - [[self.rowWidths firstObject] floatValue] == w + self.edgeInsets.right){
|
||
|
|
//换行
|
||
|
|
x = self.edgeInsets.left;
|
||
|
|
y = [[self.columnHeights firstObject] floatValue] + self.rowMargin;
|
||
|
|
[self.rowWidths replaceObjectAtIndex:0 withObject:@(x + w)];
|
||
|
|
[self.columnHeights replaceObjectAtIndex:0 withObject:@(y + h)];
|
||
|
|
|
||
|
|
}else{
|
||
|
|
//换行
|
||
|
|
x = self.edgeInsets.left;
|
||
|
|
y = [[self.columnHeights firstObject] floatValue] + self.rowMargin;
|
||
|
|
[self.rowWidths replaceObjectAtIndex:0 withObject:@(x + w)];
|
||
|
|
[self.columnHeights replaceObjectAtIndex:0 withObject:@(y + h)];
|
||
|
|
}
|
||
|
|
|
||
|
|
//记录内容的高度
|
||
|
|
self.maxColumnHeight = [[self.columnHeights firstObject] floatValue] ;
|
||
|
|
|
||
|
|
return CGRectMake(x, y, w, h);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
//水平瀑布流 item等高不等宽
|
||
|
|
- (CGRect)itemFrameOfHorizontalWaterFlow:(NSIndexPath *)indexPath{
|
||
|
|
|
||
|
|
//collectionView的高度
|
||
|
|
CGFloat collectionH = self.collectionView.frame.size.height;
|
||
|
|
//设置布局属性item的frame
|
||
|
|
CGFloat h = (collectionH - self.edgeInsets.top - self.edgeInsets.bottom - (self.rowCount - 1) * self.rowMargin) / self.rowCount;
|
||
|
|
CGFloat w = [self.delegate waterFlowLayout:self sizeForItemAtIndexPath:indexPath].width;
|
||
|
|
|
||
|
|
//找出宽度最短的那一行
|
||
|
|
NSInteger destRow = 0;
|
||
|
|
CGFloat minRowWidth = [self.rowWidths[0] doubleValue];
|
||
|
|
for (NSInteger i = 1; i < self.rowWidths.count; i++) {
|
||
|
|
//取出第i行
|
||
|
|
CGFloat rowWidth = [self.rowWidths[i] doubleValue];
|
||
|
|
if (minRowWidth > rowWidth) {
|
||
|
|
minRowWidth = rowWidth;
|
||
|
|
destRow = i;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
CGFloat y = self.edgeInsets.top + destRow * (h + self.rowMargin);
|
||
|
|
CGFloat x = minRowWidth;
|
||
|
|
if (x != self.edgeInsets.left) {
|
||
|
|
x += self.columnMargin;
|
||
|
|
}
|
||
|
|
|
||
|
|
//更新最短那行的宽度
|
||
|
|
self.rowWidths[destRow] = @(CGRectGetMaxX(CGRectMake(x, y, w, h)));
|
||
|
|
//记录内容的宽度
|
||
|
|
CGFloat rowWidth = [self.rowWidths[destRow] doubleValue];
|
||
|
|
if (self.maxRowWidth < rowWidth) {
|
||
|
|
self.maxRowWidth = rowWidth ;
|
||
|
|
}
|
||
|
|
|
||
|
|
return CGRectMake(x, y, w, h);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
//水平栅格布局
|
||
|
|
- (CGRect)itemFrameOfHorizontalGridWaterFlow:(NSIndexPath *)indexPath{
|
||
|
|
|
||
|
|
//collectionView的高度
|
||
|
|
CGFloat collectionH = self.collectionView.frame.size.height;
|
||
|
|
//设置布局属性item的frame
|
||
|
|
CGFloat h = [self.delegate waterFlowLayout:self sizeForItemAtIndexPath:indexPath].height;
|
||
|
|
CGFloat w = [self.delegate waterFlowLayout:self sizeForItemAtIndexPath:indexPath].width;
|
||
|
|
|
||
|
|
CGFloat x = 0;
|
||
|
|
CGFloat y = 0;
|
||
|
|
|
||
|
|
//找出宽度最短的那一行
|
||
|
|
NSInteger destRow = 0;
|
||
|
|
CGFloat minRowWidth = [self.rowWidths[destRow] doubleValue];
|
||
|
|
for (NSInteger i = 1; i < self.rowWidths.count; i++) {
|
||
|
|
//取出第i行
|
||
|
|
CGFloat rowWidth = [self.rowWidths[i] doubleValue];
|
||
|
|
if (minRowWidth > rowWidth) {
|
||
|
|
minRowWidth = rowWidth;
|
||
|
|
destRow = i;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
y = destRow == 0 ? self.edgeInsets.top : self.edgeInsets.top + h + self.rowMargin;
|
||
|
|
|
||
|
|
x = [self.rowWidths[destRow] doubleValue] == self.edgeInsets.left ? self.edgeInsets.left : [self.rowWidths[destRow] doubleValue] + self.columnMargin;
|
||
|
|
//更新最短那行的宽度
|
||
|
|
if (h >= collectionH - self.edgeInsets.bottom - self.edgeInsets.top) {
|
||
|
|
x = [self.rowWidths[destRow] doubleValue] == self.edgeInsets.left ? self.edgeInsets.left : self.maxRowWidth + self.columnMargin;
|
||
|
|
for (NSInteger i = 0; i < 2; i++) {
|
||
|
|
self.rowWidths[i] = @(x + w);
|
||
|
|
}
|
||
|
|
}else{
|
||
|
|
self.rowWidths[destRow] = @(x + w);
|
||
|
|
}
|
||
|
|
//记录最大宽度
|
||
|
|
if (self.maxRowWidth < x + w) {
|
||
|
|
self.maxRowWidth = x + w ;
|
||
|
|
}
|
||
|
|
|
||
|
|
return CGRectMake(x, y, w, h);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
- (CGRect)itemFrameOfLineWaterFlow:(NSIndexPath *)indexPath{
|
||
|
|
|
||
|
|
//collectionView的高度
|
||
|
|
CGFloat collectionH = self.collectionView.frame.size.height;
|
||
|
|
//设置布局属性item的frame
|
||
|
|
CGFloat h = [self.delegate waterFlowLayout:self sizeForItemAtIndexPath:indexPath].height;
|
||
|
|
CGFloat w = [self.delegate waterFlowLayout:self sizeForItemAtIndexPath:indexPath].width;
|
||
|
|
|
||
|
|
CGFloat y = self.edgeInsets.top;
|
||
|
|
CGFloat x = [[self.rowWidths firstObject] floatValue];
|
||
|
|
if (x != self.edgeInsets.left) {
|
||
|
|
x += self.columnMargin;
|
||
|
|
}
|
||
|
|
|
||
|
|
//更新内容的宽度
|
||
|
|
[self.rowWidths replaceObjectAtIndex:0 withObject:@(x + w)];
|
||
|
|
//记录内容的宽度
|
||
|
|
self.maxRowWidth = [[self.rowWidths firstObject] floatValue];
|
||
|
|
|
||
|
|
return CGRectMake(x, y, w, h);
|
||
|
|
}
|
||
|
|
|
||
|
|
//返回头视图的布局frame
|
||
|
|
- (CGRect)headerViewFrameOfVerticalWaterFlow:(NSIndexPath *)indexPath{
|
||
|
|
|
||
|
|
CGSize size = CGSizeZero;
|
||
|
|
|
||
|
|
if([self.delegate respondsToSelector:@selector(waterFlowLayout:sizeForHeaderViewInSection:)]){
|
||
|
|
size = [self.delegate waterFlowLayout:self sizeForHeaderViewInSection:indexPath.section];
|
||
|
|
}
|
||
|
|
|
||
|
|
if (self.flowLayoutStyle == WSLWaterFlowVerticalEqualWidth) {
|
||
|
|
|
||
|
|
CGFloat x = 0;
|
||
|
|
CGFloat y = self.maxColumnHeight == 0 ? self.edgeInsets.top : self.maxColumnHeight;
|
||
|
|
if (![self.delegate respondsToSelector:@selector(waterFlowLayout:sizeForFooterViewInSection:)] || [self.delegate waterFlowLayout:self sizeForFooterViewInSection:indexPath.section].height == 0) {
|
||
|
|
y = self.maxColumnHeight == 0 ? self.edgeInsets.top : self.maxColumnHeight + self.rowMargin;
|
||
|
|
}
|
||
|
|
|
||
|
|
self.maxColumnHeight = y + size.height ;
|
||
|
|
|
||
|
|
[self.columnHeights removeAllObjects];
|
||
|
|
for (NSInteger i = 0; i < self.columnCount; i++) {
|
||
|
|
[self.columnHeights addObject:@(self.maxColumnHeight)];
|
||
|
|
}
|
||
|
|
|
||
|
|
return CGRectMake(x , y, self.collectionView.frame.size.width, size.height);
|
||
|
|
|
||
|
|
}else if (self.flowLayoutStyle == WSLWaterFlowVerticalEqualHeight){
|
||
|
|
|
||
|
|
CGFloat x = 0;
|
||
|
|
CGFloat y = self.maxColumnHeight == 0 ? self.edgeInsets.top : self.maxColumnHeight;
|
||
|
|
if (![self.delegate respondsToSelector:@selector(waterFlowLayout:sizeForFooterViewInSection:)] || [self.delegate waterFlowLayout:self sizeForFooterViewInSection:indexPath.section].height == 0) {
|
||
|
|
y = self.maxColumnHeight == 0 ? self.edgeInsets.top : self.maxColumnHeight + self.rowMargin;
|
||
|
|
}
|
||
|
|
|
||
|
|
self.maxColumnHeight = y + size.height ;
|
||
|
|
|
||
|
|
[self.rowWidths replaceObjectAtIndex:0 withObject:@(self.collectionView.frame.size.width)];
|
||
|
|
[self.columnHeights replaceObjectAtIndex:0 withObject:@(self.maxColumnHeight)];
|
||
|
|
|
||
|
|
return CGRectMake(x , y, self.collectionView.frame.size.width, size.height);
|
||
|
|
|
||
|
|
|
||
|
|
}else if (self.flowLayoutStyle == WSLWaterFlowHorizontalEqualHeight){
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return CGRectMake(0, 0, 0, 0);
|
||
|
|
|
||
|
|
}
|
||
|
|
//返回脚视图的布局frame
|
||
|
|
- (CGRect)footerViewFrameOfVerticalWaterFlow:(NSIndexPath *)indexPath{
|
||
|
|
|
||
|
|
CGSize size = CGSizeZero;
|
||
|
|
|
||
|
|
if([self.delegate respondsToSelector:@selector(waterFlowLayout:sizeForFooterViewInSection:)]){
|
||
|
|
size = [self.delegate waterFlowLayout:self sizeForFooterViewInSection:indexPath.section];
|
||
|
|
}
|
||
|
|
|
||
|
|
if (self.flowLayoutStyle == WSLWaterFlowVerticalEqualWidth ) {
|
||
|
|
|
||
|
|
CGFloat x = 0;
|
||
|
|
CGFloat y = size.height == 0 ? self.maxColumnHeight : self.maxColumnHeight + self.rowMargin;
|
||
|
|
|
||
|
|
self.maxColumnHeight = y + size.height;
|
||
|
|
|
||
|
|
[self.columnHeights removeAllObjects];
|
||
|
|
for (NSInteger i = 0; i < self.columnCount; i++) {
|
||
|
|
[self.columnHeights addObject:@(self.maxColumnHeight)];
|
||
|
|
}
|
||
|
|
|
||
|
|
return CGRectMake(x , y, self.collectionView.frame.size.width, size.height);
|
||
|
|
|
||
|
|
}else if (self.flowLayoutStyle == WSLWaterFlowVerticalEqualHeight){
|
||
|
|
|
||
|
|
CGFloat x = 0;
|
||
|
|
CGFloat y = size.height == 0 ? self.maxColumnHeight : self.maxColumnHeight + self.rowMargin;
|
||
|
|
|
||
|
|
self.maxColumnHeight = y + size.height;
|
||
|
|
|
||
|
|
[self.rowWidths replaceObjectAtIndex:0 withObject:@(self.collectionView.frame.size.width)];
|
||
|
|
[self.columnHeights replaceObjectAtIndex:0 withObject:@(self.maxColumnHeight)];
|
||
|
|
|
||
|
|
return CGRectMake(x , y, self.collectionView.frame.size.width, size.height);
|
||
|
|
|
||
|
|
}else if (self.flowLayoutStyle == WSLWaterFlowHorizontalEqualHeight){
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return CGRectMake(0, 0, 0, 0);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
@end
|