Question

我正在尝试在iOS应用程序中创建集合视图，其中将显示图像和标签。我能够在集合视图中显示图像，但我遇到UILabel的问题。我有：
NSArray *categoryArray;
categoryArray = [NSArray arrayWithObjects:@"abc",@"xyz",@"qwe",@"asdf",@"fgh",@"hjk",@"lkj",@"ghj",@"sdf",nil];。

现在我希望将此文本动态分配给放置在Collection视图中的UILabel。这是我尝试过的。

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *identifier = @"Cell";

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
    cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame.png"]];
    //UILabel *txtCatName = (UILabel *)[cell viewWithTag:100];
//    txtCatName.text = @"Testing";
    return cell;
}

Answer 1

将标签放在UICollectionViewCell中，然后按照添加图像的方式，动态添加标签文本。将您的功能代码编辑为类似的内容。

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *identifier = @"Cell";

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
    cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame.png"]];

    cell.txtLabel.text = [categoryArray objectAtIndex:indexPath.row];

    //UILabel *txtCatName = (UILabel *)[cell viewWithTag:100];
//    txtCatName.text = @"Testing";
    return cell;
}

Answer 2

更改标签标签并尝试此操作。（设置标签标签：99）

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"Cell";

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

    UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
    recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
    cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame.png"]];
     UILabel *txtCatName = (UILabel *)[cell viewWithTag:99];
        txtCatName.text = [categoryArray objectAtIndex: indexPath.row] ";
    return cell;
}

Answer 3

把这个放在线后 cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame.png"]];

/*This is to avoid overlapp due to cell reuse.This will remove all labels in the cell. If only a particular label is to be removed put a tag range to it like label.tag = 100+indexPath.row and change the if accordingly to match this tag range*/

for (UIView *view in cell.subviews) {
    if ([view isKindOfClass:[UILabel class]]) {
        [view removeFromSuperview];
    }
}


UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 30)];//Set the frame as per your requirement.
[label setText:[NSString stringWithFormat:@"%@",[categoryArray objectAtIndex:indexPath.row]]];
[cell addSubview:label];
return cell;

此外，如果您使用自定义单元格，请向单元格添加UILabel并创建IBOulet属性，然后更新此方法中的文本。无需担心重叠。最好通过xib添加，因为如果子视图的数量增加，循环遍历所有子视图将导致性能问题。希望这会有所帮助。

如何从NSArray动态地向UILabel提供文本

3 个答案: