触摸并拖动 UIButton，但松开手指时不触发它

我试图允许一些UIButton我的一个视图上的实例被触摸并在屏幕上拖动（最终带有动力，但那是稍后的事！）。我以非常简单的形式工作，如下所示，但问题是通过触摸按钮开始拖动它，它会附着到手指上，并且通过抬起手指，会触发“Touch Up Inside”事件，这是我实际点击按钮时要执行的代码。

简而言之：如何区分点击和拖动/释放？我是否需要将点击更改为短点击手势识别器或类似的识别器？代码：

在viewDidLoad中：

[firstButton addTarget: self action: @selector(wasDragged: withEvent:) forControlEvents: UIControlEventTouchDragInside];

我的 wasDragged 方法：

- (void)wasDragged:(UIButton *)button withEvent:(UIEvent *)event
{
    if (button == letter1Button) {
        UITouch *touch = [[event touchesForView:button] anyObject];

        CGPoint previousLocation = [touch previousLocationInView:button];
        CGPoint location = [touch locationInView:button];
        CGFloat delta_x = location.x - previousLocation.x;
        CGFloat delta_y = location.y - previousLocation.y;

        button.center = CGPointMake(button.center.x + delta_x, button.center.y + delta_y);
    }
}

你可以使用UIPanGestureRecognizer并告诉它取消视图中的触摸...

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIPanGestureRecognizer *panRecognizer;
    panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self
                                                            action:@selector(wasDragged:)];
    // cancel touches so that touchUpInside touches are ignored
    panRecognizer.cancelsTouchesInView = YES;
    [[self draggableButton] addGestureRecognizer:panRecognizer];

}

- (void)wasDragged:(UIPanGestureRecognizer *)recognizer {
    UIButton *button = (UIButton *)recognizer.view;
    CGPoint translation = [recognizer translationInView:button];

    button.center = CGPointMake(button.center.x + translation.x, button.center.y + translation.y);
    [recognizer setTranslation:CGPointZero inView:button];
}

- (IBAction)buttonWasTapped:(id)sender {
    NSLog(@"%s - button tapped",__FUNCTION__);
}