问题描述
我有一个 UICollectionView
,其中包含不同大小标签的单元格。我正在尝试根据标签的大小调整单元格的大小。但是 sizeForItemAtIndexPath
我创建单元格的地方似乎在 cellForItemAtIndexPath
之前调用我在哪里设置标签..任何想法我是什么可以在这里做什么?
I've got a UICollectionView
that will have cells with labels of varying sizes. I'm trying to size the cell based on the size of the label. However sizeForItemAtIndexPath
where I create the cell seems to be called before cellForItemAtIndexPath
where I set the label.. Any ideas what I can do here?
- (void)getLabelSize:(UILabel *)label {
float widthIs = [label.text boundingRectWithSize:label.frame.size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{ NSFontAttributeName:label.font } context:nil].size.width;
width = widthIs;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
// Configure the cell
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
UILabel *label = (UILabel *)[cell viewWithTag:1000];
label.text = @"This is pretty long";
[label sizeToFit];
[self getLabelSize:label];
NSLog([NSString stringWithFormat:@"%f", width]);
cell.backgroundColor = [UIColor whiteColor];
return cell;
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake(width, 50);
}
推荐答案
在 swift 我已经计算了标签的文本大小并根据它更新了单元格大小:
In swift i have calculated the text size of label and updated the cell size according to it:
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
let size: CGSize = keywordArray[indexPath.row].size(attributes: [NSFontAttributeName: UIFont.systemFont(ofSize: 14.0)])
return CGSize(width: size.width + 45.0, height: keywordsCollectionView.bounds.size.height)
}
因为我有一个额外的按钮和填充我计算了额外的值45.0
as i have an extra button and padding i calculated that extra value which is 45.0
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