我想在单元格中创建一个通常的horizo​​ntalScrolling flowLayout UICollectionView，其中包含estimateItemSize和preferredLayoutAttributesFittingAttributes。但最后一个单元格有问题。任何想法在哪里？

Project itself

@implementation RowCollectionView

- (instancetype) initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout

{

if (self = [super initWithFrame:frame collectionViewLayout:layout])

{

[self configureRowCollectionView];

}

return self;

}

- (void) awakeFromNib

{

[super awakeFromNib];

[self configureRowCollectionView];

}

- (void) configureRowCollectionView

{

self.backgroundColor = [UIColor lightGrayColor];

self.dataSource = self;

self.delegate = self;

// Horizontal Direction

UICollectionViewFlowLayout *flowLayout = (UICollectionViewFlowLayout *) self.collectionViewLayout;

flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;

// Estimated Item Size

flowLayout.estimatedItemSize = CGSizeMake(self.bounds.size.height, self.bounds.size.height);

[self registerClass:[RowCollectionViewCell class] forCellWithReuseIdentifier:NSStringFromClass([RowCollectionViewCell class])];

}

- (NSInteger) collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

return 10;

}

- (UICollectionViewCell *) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

{

UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([RowCollectionViewCell class]) forIndexPath:indexPath];

cell.contentView.backgroundColor = [UIColor redColor];

return cell;

}

@end

@implementation RowCollectionViewCell

- (UICollectionViewLayoutAttributes *) preferredLayoutAttributesFittingAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes

{

[super preferredLayoutAttributesFittingAttributes:layoutAttributes];

UICollectionViewLayoutAttributes *attributes = [layoutAttributes copy];

attributes.size = CGSizeMake(80, 80);

return attributes;

}

@end