Question

我有一个包含UICollectionView的视图，它加载了UICollectionViewCell的外部cellnib文件。我的数据正确地显示了我想要的方式。我想根据其中的textlabel保持单元格高度，但我不确定在下面的代码中我缺少什么。我试过通过答案，但对如何解决它没有多大意义。请帮忙。提前谢谢。

  - (UICollectionViewCell *) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    MyCollectionViewCell *cell =  (MyCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@" mycell" forIndexPath:indexPath];

    NSString *string = cell.lblContact.text;
    CGSize size = [self getLabelSize:string];
    NSLog(@"%f and %f",size.width ,size.height);

   return cell;
}

- (CGSize)getLabelSize:(NSString *)string {

    UIFont *updatedFont = [UIFont fontWithName:@"myFont" size:18.0];
    CGRect rect = [string boundingRectWithSize:(CGSize){maxWidth, CGFLOAT_MAX} options:NSStringDrawingUsesLineFragmentOrigin attributes:@{ NSFontAttributeName: updatedFont } context:nil];
    return rect.size;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    CGSize retval = CGSizeMake(collectionView.frame.size.width, 75);
    return retval;
}

- (UIEdgeInsets)collectionView: (UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section 
{
     return UIEdgeInsetsMake(0, 0, 0, 0);
}

Answer 1

我找到了解决方案。我在sizeForItemAtIndexPath中创建了一个字符串，该字符串从与cell.lblContact.text相同的位置获取值。

MyObject *mc = (MyObject *) [contactArray objectAtIndex:indexPath.row];
NSString *myString = mc.contactName;
CGSize size = [self getLabelSize:myString];
NSLog(@"%@", myString);
NSLog(@"%f", size.height);

if (myString.length > 25) {
    CGSize retval = CGSizeMake(collectionView.frame.size.width, size.height);
    [collectionView layoutIfNeeded];
    return retval;
} else {
    CGSize retval = CGSizeMake(collectionView.frame.size.width, 75);
    return retval;
}

Answer 2

您检索标签的大小，但看起来您使用不同的CGSize来标记标签大小。而不是CGSizeMake(collectionView.frame.size.width, 75)，请尝试保留对标签大小的引用，并将其用作返回值：

- (UICollectionViewCell *) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    MyCollectionViewCell *cell =  (MyCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@" mycell" forIndexPath:indexPath];

    NSString *string = cell.lblContact.text;
    self.labelSize = [self getLabelSize:string];

    return cell;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    return self.labelSize;
}

修改

您是否尝试过访问标签的框架并进行存储？

self.labelSize = CGSizeMake(self.myCell.frame.size.width, self.myCell.frame.size.height);

UICollectionViewCell高度基于标签大小

2 个答案: