在 UIScrollView 中检测长按

【问题标题】：Detect long tap in UIScrollView在 UIScrollView 中检测长按
【发布时间】：2010-04-06 14:21:16
【问题描述】：

如何检测 UIScrollView 中的长按（长按）？

【问题讨论】：

【解决方案1】：

在视图的touchesBegan: 中，您可以稍稍延迟调用您的“长按”句柄。

[touchHandler performSelector:@selector(longTap:) withObject:nil afterDelay:1.5];

然后在视图的touchesEnded: 中，如果没有足够的时间，您可以取消该调用：

[NSObject cancelPreviousPerformRequestsWithTarget:touchHandler selector:@selector(longTap:) object:nil];

【讨论】：

【解决方案2】：

//Add  gesture to a method where the view is being created. In this example long tap is added to tile (a subclass of UIView):

    // Add long tap for the main tiles
    UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longTap:)];
    [tile addGestureRecognizer:longPressGesture];
    [longPressGesture release];

-(void) longTap:(UILongPressGestureRecognizer *)gestureRecognizer{
    NSLog(@"gestureRecognizer= %@",gestureRecognizer);
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan) {
        NSLog(@"longTap began");

    }

}

【讨论】：