ios - 如何删除 UICollectionViewCells 之间的空格？

Question

我试图删除 UICollectionView 之间的空格，这是设备的屏幕截图

我真的在努力避免那些空格(蓝色)并且我尝试了以下代码

这是我的 collectionview 委托(delegate)

#pragma mark <UICollectionViewDataSource>

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return 1;
}


- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return 30;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
    cell.backgroundColor = [UIColor redColor];
    return cell;
}

我先试了这个，还是不行

- (void)viewDidLoad {
    [super viewDidLoad];
    UICollectionViewFlowLayout *flow = [[UICollectionViewFlowLayout alloc] init];
    flow.itemSize = CGSizeMake(cell.frame.size.width, cell.frame.size.height);
    flow.scrollDirection = UICollectionViewScrollPositionCenteredVertically;
    flow.minimumInteritemSpacing = 0;
    flow.minimumLineSpacing = 0;
    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];

}

这个我也试过了，还是不行

#pragma mark collection view cell paddings
- (UIEdgeInsets)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(0, 0, 0, 0); // top, left, bottom, right
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {

    return 5.0;
}

请帮我解决这个问题。

Answer 1

所以有属性和方法可以限制最小空间，比如minimumInteritemSpacingForSectionAtIndex

然而，它只是“最小空间”并不总是最大空间。

这是我正在使用的:借自 Cell spacing in UICollectionView

覆盖标准流布局:

- (NSArray *) layoutAttributesForElementsInRect:(CGRect)rect {
    NSArray *answer = [super layoutAttributesForElementsInRect:rect];

    for(int i = 1; i < [answer count]; ++i) {
        UICollectionViewLayoutAttributes *currentLayoutAttributes = answer[i];
        UICollectionViewLayoutAttributes *prevLayoutAttributes = answer[i - 1];
        NSInteger maximumSpacing = 4;
        NSInteger origin = CGRectGetMaxX(prevLayoutAttributes.frame);

        if(origin + maximumSpacing + currentLayoutAttributes.frame.size.width < self.collectionViewContentSize.width) {
            CGRect frame = currentLayoutAttributes.frame;
            frame.origin.x = origin + maximumSpacing;
            currentLayoutAttributes.frame = frame;
        }
    }
    return answer;
}

maximumSpacing 可以设置为您喜欢的任何值