iPhone iOS如何将UILongPressGestureRecognizer和UITapGestureRecognizer添加到同一个控件并防止冲突？答案

【问题标题】：iPhone iOS how to add a UILongPressGestureRecognizer and UITapGestureRecognizer to the same control and prevent conflict?iPhone iOS如何将UILongPressGestureRecognizer和UITapGestureRecognizer添加到同一个控件并防止冲突？
【发布时间】：2012-04-01 11:40:31
【问题描述】：

我正在构建一个 iPhone 应用程序，它可以让用户重新排列屏幕上的一些 UI 元素。

如何将点击手势识别器和长按手势识别器添加到同一个 UIView？当我从长按中抬起手指时，点击手势识别器会触发。如何在用户执行长按时暂时禁用轻击手势识别器或阻止它触发？

谢谢！

【问题讨论】：

标签： iphone ios uiview uitapgesturerecognizer long-press

【解决方案1】：

要成功结合两者，您需要：

1º 在标题处添加到界面手势委托

@interface ViewController : ViewController <UIGestureRecognizerDelegate>

2º 创建手势事件并将视图添加到源文件中：

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touch:)];
    [tap setNumberOfTapsRequired:1]; // Set your own number here
    [tap setDelegate:self]; // Add the <UIGestureRecognizerDelegate> protocol

    UILongPressGestureRecognizer *longTap = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longTouch:)];
    [longTap setNumberOfTapsRequired:0]; // Set your own number here
    [longTap setMinimumPressDuration:1.0];
    [longTap setDelegate:self]; // Add the <UIGestureRecognizerDelegate> protocol
    [tap requireGestureRecognizerToFail:longTap];   // Priority long

    [self.view addGestureRecognizer:tap];
    [self.view addGestureRecognizer:longTap];

3º 在源文件中添加回调：

- (void) touch: (UITapGestureRecognizer *)recognizer
{
    CGPoint location = [recognizer locationInView: self.HUDview];
    if (recognizer.state == UIGestureRecognizerStateBegan)
    {
        NSLog(@"touch UIGestureRecognizerStateBegan");
    }
    if (recognizer.state == UIGestureRecognizerStateEnded)
    {
        NSLog(@"touch UIGestureRecognizerStateEnded");
        //NSLog(@"Position of touch: %.3f, %.3f", location.x, location.y);    // Position landscape
    }
}

- (void) longTouch: (UILongPressGestureRecognizer *)recognizer
{
    if (recognizer.state == UIGestureRecognizerStateBegan)
    {
        NSLog(@"longTouch UIGestureRecognizerStateBegan");
    }
    if (recognizer.state == UIGestureRecognizerStateEnded)
    {
        NSLog(@"longTouch UIGestureRecognizerStateEnded");
    }
}

4º 设置手势识别器可用：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

【讨论】：

【解决方案2】：

我确实尝试过 moby 和 Journeyman 的方法，但不知何故它们不适合我的项目，所以我解决了如下问题，

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    NSLog(@"%@ %ld",touch.description, touch.phase);
    [self performSelector:@selector(checkTouch:) withObject:touch afterDelay:0.5];
    return YES;
}

和

- (void)checkTouch:(UITouch *)touch{
    NSLog(@"touch phase = %ld",touch.phase);
    if (touch.phase == UITouchPhaseStationary) {
        //still holding my hand and this means I wanted longPressTouch
    }
    if (touch.phase == UITouchPhaseEnded){
        //I released my finger so it's obviously tap 
    }
}

这可能是更简单的解决方案，但当然取决于项目。

【讨论】：

【解决方案3】：

作为替代方法，不要有两个单独的识别器 - 只需对两个事件都使用 LongPress 识别器：

配置如下：

UILongPressGestureRecognizer* longPress = [ [ UILongPressGestureRecognizer alloc ] initWithTarget:self.nextResponder action:@selector(longPressEvent:)];
    categoryPanelDrag.minimumPressDuration = 0.0;

那么处理如下：

- (BOOL)longPressEvent:(UILongPressGestureRecognizer *)gesture {

    // _dragStarted is a class-level BOOL

    if(UIGestureRecognizerStateBegan == gesture.state) {
        _dragStarted = NO;
    }

    if(UIGestureRecognizerStateChanged == gesture.state) {
        _dragStarted = YES;
        // Do dragging stuff here
    }

    if(UIGestureRecognizerStateEnded == gesture.state) {

        if (_dragStarted == NO)
        {
            // Do tap stuff here

        }
        else
        {
            // Do drag ended stuff here
        }
    }

    return YES;

}

【讨论】：

@Softlion 不要忘记 .h 文件上的 UIGestureRecognizerDelegate 接口 :-)
它可以编译并运行，但不能防止冲突。我使用 2 个识别器和 gestureRecognizer(_:shouldRecognizeSimultaneouslyWithGestureRecognizer:) 解决了这个问题

【解决方案4】：

要让两种手势协同工作，请实现以下委托方法：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}

要使长按优先，请执行以下操作：

[tapGesture requireGestureRecognizerToFail:longPress];

【讨论】：

脱帽致敬。很好的答案。
脱帽致敬。这最后一行代码就是我需要的。

【解决方案5】：

您可以在代码中处理它，在长按期间设置一个标志，如果在标志为真或其他任何情况下调用点击，则不要执行点击代码并重置标志。我不知道更好的方法

【讨论】：