iOS：长按时在 uicollectionViewcell 上显示带有文本的标签

Posted 2023-02-23

【中文标题】iOS：长按时在 uicollectionViewcell 上显示带有文本的标签

【英文标题】：iOS:Dispaly label with text on collectionView cell on long press

【发布时间】：2015-01-03 06:14:17

【问题描述】：

我想在长按时在 collectionViewCell 上显示带有文本的标签。 我要显示的文本来自数组。

以下是我的代码：

// This code is in cellForItemAtIndexPath method
// attach long press gesture to collectionView
UILongPressGestureRecognizer *lpgr= [[UILongPressGestureRecognizer alloc]
   initWithTarget:self action:@selector(handleLongPress:)];
lpgr.minimumPressDuration = .5; //seconds
lpgr.delegate = self;
[collectionViewAlbumImages addGestureRecognizer:lpgr];

lpgr.delaysTouchesBegan = YES;






-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer

if (gestureRecognizer.state != UIGestureRecognizerStateEnded) 
    return;

CGPoint p = [gestureRecognizer locationInView:collectionViewAlbumImages];

NSIndexPath *indexPath = [collectionViewAlbumImages indexPathForItemAtPoint:p];
if (indexPath == nil)
    NSLog(@"couldn't find index path");
 else 
    // get the cell at indexPath (the one you long pressed)
    UICollectionViewCell* cell =[collectionViewAlbumImages cellForItemAtIndexPath:indexPath];
    globalVariable = [GlobalBrogaard sharedInstanceMethod];

    strCellImageName = [NSString stringWithFormat: @"%@",[globalVariable.arrImageName objectAtIndex:indexPath.row]];


    NSLog(@"cell %f , %f",cell.frame.origin.x, cell.frame.origin.y);
    // Init and add label
    lblImageName = [[UILabel alloc] initWithFrame:CGRectMake(cell.frame.origin.x, cell.frame.origin.y, 200, 200)];
    lblImageName.layer.cornerRadius=6;
    lblImageName.clipsToBounds=NO;
    lblImageName.text = strCellImageName;
    [lblImageName setTextAlignment:NSTextAlignmentLeft];
    lblImageName.lineBreakMode = NSLineBreakByCharWrapping;
    lblImageName.numberOfLines = 0;

    lblImageName.font = [UIFont systemFontOfSize:14];
    lblImageName.textColor = [UIColor whiteColor];
    lblImageName.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.6];
    [lblImageName sizeToFit];


    [cell addSubview:lblImageName];

    [lblImageName setAlpha:0.0f];

    //fade in
    [UIView animateWithDuration:2.0f animations:^

        [lblImageName setAlpha:1.0f];

     completion:^(BOOL finished) 

        //fade out
        [UIView animateWithDuration:2.0f animations:^

            [lblImageName setAlpha:0.0f];
            [lblImageName removeFromSuperview];

         completion:nil];

    ];

但问题是它仅适用于第一个集合视图单元格长按，并且在剩余的单元格上它不会显示任何标签。 请告诉我我的代码有什么问题？？

【参考方案1】：

我已经通过改变这一行解决了这个问题：

lblImageName = [[UILabel alloc] initWithFrame:CGRectMake(cell.frame.origin.x, cell.frame.origin.y, 200, 200)];

到：

lblImageName = [[UILabel alloc] initWithFrame:CGRectMake(0,0, 200, 200)];