UICollectionView 上添加长按手势如何监听?

思路:

  1. 添加长按手势,并设置代理

  2. 在手势回调方法中判断是否结束

首先添加代理

@interface myCollectionViewController : UICollectionViewController<UIGestureRecognizerDelegate>

其次实现:

- (void)viewDidLoad {
    // attach long press gesture to collectionView
    UILongPressGestureRecognizer *lpgr
    = [[UILongPressGestureRecognizer alloc]
       initWithTarget:self action:@selector(handleLongPress:)];
    lpgr.minimumPressDuration = .5; //seconds
    lpgr.delegate = self;
    [self.collectionView addGestureRecognizer:lpgr];
}

- (void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer {
    if (gestureRecognizer.state != UIGestureRecognizerStateEnded) {
        return;
    }
    CGPoint p = [gestureRecognizer locationInView:self.collectionView];
    
    NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:p];
    if (indexPath == nil){
        NSLog(@"couldn't find index path");
    } else {
        // get the cell at indexPath (the one you long pressed)
        UICollectionViewCell* cell =
        [self.collectionView cellForItemAtIndexPath:indexPath];
        // do stuff with the cell
    }
}

注意:

在iOS7时,需要添加

lpgr.delaysTouchesBegan = YES;

避免didHighlightItemAtIndexPath先触发。


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