UICollectionView 的动态单元格宽度取决于标签宽度 [英] Dynamic cell width of UICollectionView depending on label width

问题描述

我有一个 UICollectionView，它从包含标签的可重用单元格加载单元格.数组提供该标签的内容.我可以使用 sizeToFit 轻松根据内容宽度调整标签宽度.但我无法使单元格适合标签.

I have a UICollectionView, that loads cells from reusable cell, which contains label. An array provides content for that label. I can resize label width depending on content width easily with sizeToFit. But I cannot make cell to fit label.

这是代码

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    arrayOfStats =  @[@"time:",@"2",@"items:",@"10",@"difficulty:",@"hard",@"category:",@"main"];
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:     (NSInteger)section{
    return [arrayOfStats count];
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{

    return CGSizeMake(??????????);
}

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{

    return 1;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{

    Cell *cell = (Cell *) [collectionView dequeueReusableCellWithReuseIdentifier:@"qw" forIndexPath:indexPath];
    cell.myLabel.text = [NSString stringWithFormat:@"%@",[arrayOfStats objectAtIndex:indexPath.item]];
    // make label width depend on text width
    [cell.myLabel sizeToFit];

    //get the width and height of the label (CGSize contains two parameters: width and height)
    CGSize labelSize = cell.myLbale.frame.size;

    NSLog(@"
 width  = %f height = %f", labelSize.width,labelSize.height);

    return cell;
}

推荐答案

在sizeForItemAtIndexPath中返回文本的大小

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{

    return [(NSString*)[arrayOfStats objectAtIndex:indexPath.row] sizeWithAttributes:NULL];
}

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