通过UIGestureRecognizer同时处理两个不同点的点击 [英] handle taps in two different points at a same time via UIGestureRecognizer

问题描述

我在两个不同的位置有两个标签，当两个标签同时被点击时，我希望另一个标签显示成功消息。

I have two labels in two different positions, when both labels are tapped at the same time i want another label to show a success message.

我如何做到这一点？我可以通过一次或多次手指触摸来识别单击或双击，但这是一种不同的情况。请帮忙。我尝试了这个，但它不起作用。

How do I accomplish this? I can recognize a single tap or double tap with one or more finger touches but this is a different scenario. Please help. I tried this, but it does not work.

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
        tapRecognizer.numberOfTapsRequired = 1;
        tapRecognizer.numberOfTouchesRequired = 2;
        tapRecognizer.delegate = self;
        [self.view addGestureRecognizer:tapRecognizer];

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if (touch.view == tap2 && touch.view == tap1)
    {
        result.text = @"success";
    }
    return YES;
}

提前致谢。

推荐答案

我正式接受了termes的回答并且也有效，但我找到了一个更简单的解决方案。不需要两个手势识别器，可以通过简单的轻击手势识别器实现，其中触摸次数计为两次。以下是代码：

Formally I had accepted termes's answer first and that worked too, but I have found a more simpler solution to this process. There is no need for two gesture recognizers, it is achievable with a simple tap gesture recognizer with number of touches count to two. Here is the code:

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
    tapRecognizer.numberOfTapsRequired = 1;
    tapRecognizer.numberOfTouchesRequired = 2;
    tapRecognizer.delegate = self;
    [self addGestureRecognizer:tapRecognizer];

现在，在手柄点击方法中，我们可以通过 locationOfTouch：inView：，UIGestureRecognizer类的实例方法。因此，在 handleTap：方法中，我们需要检查两个触点是否在所需位置。以下是代码：

Now, in the handle tap method we can easily get the two touch points by "locationOfTouch:inView:", a instance method of UIGestureRecognizer class. So in the handleTap: method we need to check if the two touch points are in the desired location. Here is the code:

-(void)handleTap:(UITapGestureRecognizer*)recognizer
{
    if (recognizer.state == UIGestureRecognizerStateEnded)
    {
        CGPoint point1 = [recognizer locationOfTouch:0 self];
        CGPoint point2 = [recognizer locationOfTouch:1 self];

        if ([self validateTapIn:point1 and:point2])
        {
            resultLabel.text = @"success";
        }
    }
}

-(BOOL)validateTapIn:(CGPoint)point1 and:(CGPoint)point2
{
    return
    (CGRectContainsPoint(label1.frame, point1) && CGRectContainsPoint(label2.frame,:point2)) ||
    (CGRectContainsPoint(label1.frame, point2) && CGRectContainsPoint(label2.frame, point1));
}

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