UICollectionView cellForItemAtIndexPath未注册单元格 [英] UICollectionView cellForItemAtIndexPath not registering cell

问题描述

我正在尝试使用 UICollectionViewCell ，因为我想要显示的只是一张图片。我可以在 UICollectionViewCell 的 contentView上使用 UIColor colorWithImage：将图像添加到单元格 property。

I am trying to use UICollectionViewCell, since all I want to display is an image. I can add the image to the cell using UIColor colorWithImage: on the UICollectionViewCell's contentView property.

在我的 loadView 方法中，我按如下方式注册单元格：
[self.collectionView registerClass：[ImageCell class] forCellWithReuseIdentifier：@MyCell];

In my loadView method, I am registering the cell as follows: [self.collectionView registerClass:[ImageCell class] forCellWithReuseIdentifier:@"MyCell"];

下面是我的 cellForItemAtIndexPath 方法：

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];
    // cell customization
    return cell;
}

当我运行它时，一旦它到达出列线，它就会崩溃出现以下错误：

When I run it, as soon as it hits the dequeue line, it crashes with the following error:

*** Assertion failure in -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:]

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier MyCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'

我厌倦了设置一个自定义单元格，并将其用作类，我得到了同样的错误。我的自定义单元子类化了UICollectionViewCell并且没有实现，除了默认的 initWithFrame 。那是因为我想改变视图的背景颜色。我不确定问题是什么，但有人可以看看我的代码并帮助我吗？我一直试图弄清楚这一点，绝对没有运气。

I tired setting up a custom cell, and used it as the class and I got the same error. My custom cell subclassed UICollectionViewCell and had nothing implemented, except for the default initWithFrame. That is because I wanted to just change the background colour of the view. I am not sure what the problem is but could someone please take a look at my code and help me? I've been trying to figure this out for quite a while with absolutely no luck at all.

推荐答案

如果你只是想显示图像，您不需要进行任何子类化，您可以使用 colorWithPatternImage：设置单元格的 backgroundColor 。像这样注册这个类：

If you just want to display an image, you don't need to do any subclassing, you can set the cell's backgroundColor with colorWithPatternImage:. Register the class like this:

[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];

然后像这样使用它：

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

在这个例子中，结果是数组的 UIImages 。

In this example, results is an array of UIImages.

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