如何修复UICollectionViewCell的子类的不兼容指针 [英] How to fix an Incompatible pointer for subclass of UICollectionViewCell

问题描述

我已经实现了UICollectionViewCell的子类，我正在使用该子类在UICollectionViewController中创建单元格.现在，当我收集一个细胞时，为了对其进行处理，我会收到一条警告Incompatible pointer types initializing 'SPCell *' with an expression of type 'UICollectionViewCell *'

I've implemented a subclass SPCell of UICollectionViewCell which I am using to create cells in my UICollectionViewController. Now, when I gather a cell, in order to do something with it, I get a warning Incompatible pointer types initializing 'SPCell *' with an expression of type 'UICollectionViewCell *'

这里是一个例子.我的自定义单元格包含一个图像，我想更改其Alpha值.但是在我分配单元格的那一行中，我得到了这个警告.

Here is an example. My custom cell holds an image, which I want to change the alpha value. But in the line, where I assign the cell, I get this warning.

- (void)collectionView:(UICollectionView *)collectionView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath;{  
    SPCell *cell = [self.collectionView cellForItemAtIndexPath:indexPath];
    cell.thumbnail.alpha=0.6;
}

谢谢.

推荐答案

您只需要添加强制类型转换，以使编译器知道您在做什么-

You just need to add a cast to let the compiler know what you are doing -

- (void)collectionView:(UICollectionView *)collectionView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath;{  
    SPCell *cell = (SPCell *)[self.collectionView cellForItemAtIndexPath:indexPath];
    cell.thumbnail.alpha=0.6;
}

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