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64 lines
2.2 KiB
64 lines
2.2 KiB
1 year ago
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// EqualSpaceFlowLayout.m
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// tongxin
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//
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// Created by WeiChaoZheng on 2018/11/7.
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// Copyright © 2018年 xTT. All rights reserved.
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//
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#import "EqualSpaceFlowLayout.h"
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@implementation EqualSpaceFlowLayout
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#pragma mark - Methods to Override
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- (void)prepareLayout
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{
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[super prepareLayout];
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NSInteger itemCount = [[self collectionView] numberOfItemsInSection:0];
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self.itemAttributes = [NSMutableArray arrayWithCapacity:itemCount];
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CGFloat xOffset = self.sectionInset.left;
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CGFloat yOffset = self.sectionInset.top;
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CGFloat xNextOffset = self.sectionInset.left;
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for (NSInteger idx = 0; idx < itemCount; idx++) {
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NSIndexPath *indexPath = [NSIndexPath indexPathForItem:idx inSection:0];
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CGSize itemSize = [self.delegate collectionView:self.collectionView layout:self sizeForItemAtIndexPath:indexPath];
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xNextOffset+=(self.minimumInteritemSpacing + itemSize.width);
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if (xNextOffset > [self collectionView].bounds.size.width - self.sectionInset.right) {
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xOffset = self.sectionInset.left;
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xNextOffset = (self.sectionInset.left + self.minimumInteritemSpacing + itemSize.width);
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yOffset += (itemSize.height + self.minimumLineSpacing);
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}
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else
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{
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xOffset = xNextOffset - (self.minimumInteritemSpacing + itemSize.width);
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}
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UICollectionViewLayoutAttributes *layoutAttributes =
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[UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];
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layoutAttributes.frame = CGRectMake(xOffset, yOffset, itemSize.width, itemSize.height);
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[_itemAttributes addObject:layoutAttributes];
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}
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}
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- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath
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{
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return (self.itemAttributes)[indexPath.item];
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}
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- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
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{
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return [self.itemAttributes filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(UICollectionViewLayoutAttributes *evaluatedObject, NSDictionary *bindings) {
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return CGRectIntersectsRect(rect, [evaluatedObject frame]);
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}]];
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}
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- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds
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{
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return NO;
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}
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@end
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