如何设置UICollectionViewCell的位置？ [英] How do I set the position of a UICollectionViewCell?

问题描述

据我所知，协议方法：

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

自动设置我创建的单元格的边界。这对于我的 UICollectionViewCells 来说都是好的，但我需要其中一个在我指定的位置。任何指针在正确的方向将不胜感激。

Automatically sets the bounds of the cell I created. This is all fine and dandy for my of the UICollectionViewCells, but I need one of them to be in a location that I specify. Any pointers in the right direction would be appreciated.

推荐答案

我可以假设你也使用 UICollectionViewFlowLayout

如果是这样，快速和脏的答案是子类 UICollectionViewFlowLayout ，并覆盖 -layoutAttributesForItemAtIndexPath：方法：

If so, the quick and dirty answer is to subclass UICollectionViewFlowLayout and override the -layoutAttributesForItemAtIndexPath: method:

- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.section == 0 && indexPath.item == 2) // or whatever specific item you're trying to override
    {
        UICollectionViewLayoutAttributes *layoutAttributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];
        layoutAttributes.frame = CGRectMake(0,0,100,100); // or whatever...
        return layoutAttributes;
    }
    else
    {
        return [super layoutAttributesForItemAtIndexPath:indexPath];
    }
}

您可能还需要覆盖 -layoutAttributesForElementsInRect：：

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{
    NSArray *layoutAttributes = [super layoutAttributesForElementInRect:rect];
    if (CGRectContainsRect(rect, CGRectMake(0, 0, 100, 100))) // replace this CGRectMake with the custom frame of your cell...
    {
        UICollectionViewLayoutAttributes *layoutAttributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];
        layoutAttributes.frame = CGRectMake(0,0,100,100); // or whatever...
        return [layoutAttributes arrayByAddingObject:layoutAttributes];
    }
    else
    {
        return layoutAttributes;
    }
}

然后使用您的新子类代替 UICollectionViewFlowLayout 。

Then use your new subclass in place of UICollectionViewFlowLayout when you create your collection view.

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