带图像的UICollectionView单元格，单击更改背景 [英] UICollectionView Cell with Image, change Background with click

问题描述

我有一个 UICollectionView ，带有 Custom CollectionView Cells 。在每个Cell上都有一个Image，它与整个Cell一样大。现在我想在用户触摸Cell时突出显示Cell。首先，我尝试使用以下委托方法：

I have a UICollectionView with Custom CollectionView Cells. On each Cell there is a Image on it, which is as big as the whole Cell. Now i want to highlight the Cell when the User touches the Cell. First i tried it with the following delegate Methods:

- (void)collectionView:(UICollectionView *)collectionView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell* cell = [self.collectionView cellForItemAtIndexPath:indexPath];
cell.contentView.backgroundColor = [UIColor redColor];

}

- (void)collectionView:(UICollectionView *)collectionView didUnhighlightItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [self.collectionView cellForItemAtIndexPath:indexPath];
cell.contentView.backgroundColor = [UIColor clearColor];
}

但没有任何事情发生。我从细胞中删除了图像，它完美地工作。但随着图像没有任何反应！我还能做什么？

But nothing happend.After i deleted the Images from the Cells it worked perfectly. But with the Images nothing happens! What else can I do?

推荐答案

如果你有CustomCell，你必须有一个CustomCell.m（实现文件）。在这个文件中添加这个，对我来说很简单：

If you have a CustomCell, you must have a CustomCell.m (implementation file). In this file add this, to me is the easy way:

-(void)setHighlighted:(BOOL)highlighted
{
    if (highlighted)
    {
        self.layer.opacity = 0.6;
        // Here what do you want.
    }
    else{
        self.layer.opacity = 1.0;
        // Here all change need go back
    }
}

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