iOS UICollectionView:单元格未显示 [英] iOS UICollectionView: Cells not showing

问题描述

我在这里遗漏了一些明显的东西，因为这不是一项艰巨的任务.

我在故事板中有我的集合视图(以及其他视图)，原型单元格的重用 ID 为单元格"，该单元格中有一个 UILabel，标签为 100.

代码(样板):

I'm missing something obvious here as this isn't a difficult task.

I have my Collection view in storyboard (amongst other views), with the prototype cell's reuse id being "Cell", and a UILabel in that cell, with a tag of 100.

The code (boilerplate):

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return 1;
}


- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return 4;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];

    UILabel *label = (UILabel *)[cell viewWithTag:100];
    label.text = @"Hello";

    return cell;
}

代码应该在 UICollectionViewController 中.当我运行时，视图出现但没有单元格或文本可见.

The code is within a UICollectionViewController, as it should. When i run, the view appears yet no cells or text are visible.

A NSLog 确认它被调用了 4 次.我什至更改了原型单元格的背景颜色，这表明甚至没有出现单元格.

A NSLog in the cellForItemAtIndexPath confirms that it is called, 4 times. I've even changed the prototype cell's background color which shows that not even the cell's are appearing.

在viewDidLoad中调用:[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];

我错过了什么?

推荐答案

像这样使用:代替 registerClass:使用 registerNib:

Use like this: Instead of registerClass: use registerNib:

static NSString *identifier = @"Cell";
if ([[UIDevice currentDevice] userInterfaceIdiom]==UIUserInterfaceIdiomPhone) {
    [self.collection registerNib:[UINib nibWithNibName:@"CollectionPhotoItem" bundle:nil] forCellWithReuseIdentifier:identifier];
}
else{
    [self.collection registerNib:[UINib nibWithNibName:@"CollectionPhotoItem_ipad" bundle:nil] forCellWithReuseIdentifier:identifier];
}

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