在iOS的不同位置的UICollectionView單元上添加標簽

Question

我正在使用一個iOS應用程序，在該應用程序中，我必須通過在每個圖像上添加一個標簽來在收藏夾視圖中顯示圖像，就像在Facebook中一樣，當我們單擊Facebook中的收藏夾中的圖像時，它將展開其圖像並以標簽。 不同的圖像尺寸會出現不同的尺寸。 我也一樣。 一切正常，但是當我添加小圖像時，它會更改標簽在單元格上的位置。這意味着在大圖像上會出現兩個標簽，一個標簽恰好在我想要的位置，第二個小圖像標簽在我想要的位置。 我正在使用此代碼：

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    int i;
    Cell *cell;
    UILabel * lblName ;
    UILabel * lblName1 ;
    cell=[collectionView dequeueReusableCellWithReuseIdentifier:REUSEABLE_CELL_IDENTITY forIndexPath:indexPath];
   @try
    {
    NSLog(@"index path is %ld",(long)indexPath.row);

        if(rearr.count == 0)
          {
            cell.imageviews.image=NULL;
          }

       else
           {
            NSLog(@"count %lu",(unsigned long)rearr.count);

        for (i=0;i<rearr.count; i++)
           {
                  NSLog(@"count %lu",(unsigned long)rearr.count);
                 image = [UIImage imageWithContentsOfFile:rearr[i]];
                  NSLog(@"image.size.width1 :  %f",image.size.width);
                  NSLog(@"image.size.height1 :  %f",image.size.height);

               if(image.size.width > image.size.height)
               {

                lblName = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 230.0, 300.0,80)];
                lblName.text = @"Image";
                lblName.textAlignment = NSTextAlignmentCenter;
                [lblName setFont:[UIFont fontWithName:@"GothamRounded-Bold" size:10]];
                [lblName setTextColor:[UIColor colorWithRed:137.0f/255.0 green:137.0f/255.0 blue:137.0f/255.0 alpha:1.0]];
                [lblName setBackgroundColor:[UIColor whiteColor]];
               [cell.contentView addSubview:lblName];
               }
               else
               {

                lblName1 = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 410.0, 300.0,80)];
                lblName1.text = @"Image1";
                lblName1.textAlignment = NSTextAlignmentCenter;
                [lblName1 setFont:[UIFont fontWithName:@"GothamRounded-Bold" size:10]];
                [lblName1 setTextColor:[UIColor colorWithRed:137.0f/255.0 green:137.0f/255.0 blue:137.0f/255.0 alpha:1.0]];
                [lblName1 setBackgroundColor:[UIColor whiteColor]];
                [cell.contentView addSubview:lblName1];

               }

             if(image != nil)
                {
                 [itms addObject:image];
                }
             else
            {
            NSData  *data = [[NSData alloc]initWithContentsOfFile:rearr[i]];
            image=[UIImage imageWithData:data];
            [itms addObject:image];
            }
         }

        cell.imageviews.image=[itms objectAtIndex:indexPath.row];
        cell.imageviews.layer.cornerRadius=5.0f;
        cell.imageviews.clipsToBounds = YES;
    }


    return cell;
    }
    @catch (NSException *exception)
    {

        NSLog(@"image insertion in collecvcontroller :  exception %@",exception);
        return cell;

    }


}

請幫幫我。 我不知道我在做什么錯。

Answer 1

當您使用dequeueReusableCellWithReuseIdentifier為什么每次都要添加UILabel 。 執行以下操作，您將看到期望的輸出。

if(image.size.width > image.size.height)
{
    [[[cell contentView] viewWithTag:2] removeFromSuperView];
    lblName = [[cell contentView] viewWithTag:1];
    if(! lblName) 
    {
        lblName = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 410.0, 300.0,80)];
        [lblName setTag:1];
        [[cell contentView] addSubview:lblName];
    }
    // Do other stuff here
}
else
{
    [[[cell contentView] viewWithTag:1] removeFromSuperView];
    lblName1 = [[cell contentView] viewWithTag:2];
    if(! lblName1) 
    {
        lblName1 = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 410.0, 300.0,80)];
        [lblName1 setTag:2];
        [[cell contentView] addSubview:lblName1];
    }
    // Do other stuff here
}