如何在UICollectionViewCell中对UIImageView进行舍入？ [英] How I can round UIImageView in UICollectionViewCell?

问题描述

在我的UICollectionViewCell类中，我这样写：

In my UICollectionViewCell class I wrote this:

- (void)layoutSubviews {
    [super layoutSubviews];
    self.myImageView.layer.cornerRadius  = CGRectGetHeight(self.myImageView.frame) / 2;
    self.myImageView.layer.masksToBounds = YES;
}

但这在所有情况下均无法正常工作，看起来像这样：

But this does not work correctly in all cases, it appears like this:

推荐答案

我遇到了类似的问题试图在TableView单元格中获取collectionView 。

如果要更改单元格的模型，应告诉单元格重新计算其布局，以便单元格更改其大小并调用 layoutIfNeeded 。

If you are changing your cell's model you should tell the cell to recalculate its layout so the cell changes its size and calls layoutIfNeeded.

 - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
              cellForItemAtIndexPath:(NSIndexPath *)indexPath
         UICollectionViewCell*cell = ...
         // Do your stuff here to configure the cell
         // Tell the cell to redraw its contentView        
         [cell layoutIfNeeded];
    }

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