ios - 为什么 sizeToFit 会删除我的整个标签？

Question

我正在尝试使用函数 sizeToFit。它在整个应用程序中完美运行，但在下面的代码中不起作用。此外，如果无法按照我的方式完成，请提出建议。

            self.label = [[UILabel alloc] initWithFrame:CGRectMake(10.0, 67.0, 290, 50)];
        self.label.font= [UIFont fontWithName:@"Helvetica-Bold" size:20];
        self.label.textColor = [UIColor colorWithRed:33.0f/255.0f green:74.0f/255.0f blue:146.0f/255.0f alpha:1.0f];
        self.label.numberOfLines = 0;
        self.label.lineBreakMode = NSLineBreakByWordWrapping;
        self.label.backgroundColor = [UIColor whiteColor];
        [self.contentView addSubview:self.label];

        self.description = [[UILabel alloc] initWithFrame:CGRectMake(10.0, 380.0, 300, 400)];
        self.description.font= [UIFont fontWithName:@"Helvetica-Light" size:15];
        self.description.textColor = [UIColor blackColor];
        self.description.textAlignment = NSTextAlignmentJustified;
        self.description.numberOfLines = 0;
        self.description.lineBreakMode = NSLineBreakByWordWrapping;
        self.description.backgroundColor = [UIColor whiteColor];
        [self.description sizeToFit];
        [self.contentView addSubview:self.description];


        self.image = [[UIImageView alloc] initWithFrame:CGRectMake(20, 130, 280, 228)];
        self.image.clipsToBounds = YES;
        //[scrollView addSubview:self.image];
        [self.contentView addSubview:self.image];



        self.backgroundColor = [UIColor whiteColor];

我使用这个方法从不同的 Controller 传递数据

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    Cell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
    NSDictionary *item = [_articleListmain objectAtIndex:indexPath.item];
    // set the article image
    [cell.image setImageWithURL:[item objectForKey:@"image"]];
    [cell.label setText:[item objectForKey:@"title"]];
    [cell.description setText:[item objectForKey:@"description"]];



        return cell;
}

Answer 1

由于标签是空的，sizeToFit 将其缩小为空。这才是重点。设置一些文本，然后调用 sizeToFit，标签将刚好足够容纳文本。