与UIButton对象一起识别滑动方向

我需要知道在哪个方向上进行滑动，并知道我的视图上的哪个对象已将其发送。 我已经找到了解决方法，但它看起来很复杂和怪异，所以我怀疑是否有任何最简单的解决方案？ 我的解决方法很少：

我将识别器附加到我视图上的每个UIButton对象。

有指示器显示在执行轻扫过程中点击了哪个按钮

我必须检查这个指标和滑动方向以做出正确的决定，哪个对象和它应该移动到哪个方向。

谢谢你的建议。

@synthesize swipeDirection;   //label which shows swipe direction
@synthesize buttonNumber;       //label which shows number of button which being tapped

    - (void)viewDidLoad
    {
        UIButton* button = [UIButton buttonWithType:UIButtonTypeRoundedRect];     //creating button       
        [button setTitle:@"test1" forState:UIControlStateNormal];                        
        button.frame = CGRectMake(100, 100, 100, 100);
        [button addTarget:self                                          //adding selector which will update indicator which button been tapped, there isn't way to make swipe without tap button
                   action:@selector(updateButtonNumber:)
         forControlEvents:UIControlEventTouchDown];
        [button setTag:1];
        [self.view addSubview:button];              //add button to view
        [self beginListenToSwipes:button];          //send button to method which will add UISwipeGestureRecognizer for 4 directions

        /*same task for second button*/
        UIButton* button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];            
        [button1 setTitle:@"test2" forState:UIControlStateNormal];                        
        button1.frame = CGRectMake(200, 200, 100, 100);
        [button1 addTarget:self                         
                   action:@selector(updateButtonNumber:)
         forControlEvents:UIControlEventTouchDown];
        [button1 setTag:2];
        [self.view addSubview:button1];
        [self beginListenToSwipes:button1];

    }

    /*every time when we tap button (begin swipe this method is called and buttonNumber always points to current button*/
    -(void)updateButtonNumber:(UIButton*)sender
    {
        self.buttonNumber.text = [NSString stringWithFormat:@"%d",sender.tag];
    }

    /*method receives UIButton and add to it recognizers*/
    - (void) beginListenToSwipes:(UIButton*)sender
    {
        UISwipeGestureRecognizer *recognizer;
        recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
        [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
        [sender addGestureRecognizer:recognizer];

        recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
        [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
        [sender addGestureRecognizer:recognizer];

        recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
        [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)];
        [sender addGestureRecognizer:recognizer];

        recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
        [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)];
        [sender addGestureRecognizer:recognizer];
    }

    /*method which called when swipe performed and shows in which direction it was performed*/
    -(void)handleSwipe:(UISwipeGestureRecognizer *)recognizer 
    {
        int i = recognizer.direction;
        self.swipeDirection.text = [NSString stringWithFormat:@"%d",i];
    }

---

我的想法是，

注册UIButton的touchUpoutside事件。

当你将手指从按钮上移开时，它会被触发。

从touchesEnded方法中找到触点并将其存储在类级变量中。

比较touchupoutside方法中的按钮框和触摸点以找出移动的方向。

---

我认为你也可以把你的手势识别器放在self.view中，然后看看手势是否发生在控件的问题上（显然，你想让你的按钮ivars或你的viewcontroller的属性，所以你可以跟踪哪个是哪个），例如

CGPoint point = [sender locationInView:self.view];
if (CGRectContainsPoint(button1.frame, point))
    // do whatever you want

您是否在UIGestureRecognizerStateBegan或UIGestureRecognizerStateEnded或两者都执行此逻辑取决于您。

更新：

顺便说一下，如果你正在检测你正在移动什么方向，你也可以考虑使用UIPanGestureRecognizer，它可以在单个手势识别器中处理所有四个方向（因为它是一个连续的，你可以提供给用户实时反馈UI动画）。

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