触摸并拖动一个UIButton，但释放手指时不会触发它(Touch and drag a UIBut

我试图让一些UIButton对自己的看法一个实例被感动，并在屏幕上拖动（最终与气势，但那是以后！）。 我有这个工作在一个非常简单的形式，如下图所示，但问题是，通过触摸按钮，开始拖动它，它附着在手指上，将手指抬起关闭时，将触发“触摸的内心”活动，这是我想在实际敲击按钮时执行的代码。

概括地说：我怎么水龙头和拖动/释放区分？ 我是否需要抽头变换短抽头手势识别，或类似的，也许？ 码：

在viewDidLoad中：

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

而我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);
    }
}

Answer 1:

你可以使用一个UIPanGestureRecognizer并告诉它取消触摸鉴于...

- (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__);
}

Answer 2:

对于像我这样的初学者，我试图UIPanGestureRecognizer按照以上建议，但没有奏效。 所以，这里是我的简单的解决办法：首先，添加事件侦听器通过贝格的建议：

// add drag listener
[button addTarget:self action:@selector(wasDragged:withEvent:) forControlEvents:UIControlEventTouchDragInside];
// add tap listener
[button addTarget:self action:@selector(wasTapped:) forControlEvents:UIControlEventTouchUpInside];

这两个阻力和自来水都将触发UIControlEventTouchUpInside ，所以在添加一个标志wasDragged:withEvent:是这样的：

-(IBAction)wasDragged: (id)sender withEvent: (UIEvent *) event {
    was_dragged = YES;
    UIButton *selected = (UIButton *)sender;
    selected.center = [[[event allTouches] anyObject] locationInView:self.view];
}

- (IBAction)buttonWasTapped:(id)sender {
    if(!was_dragged)
        NSLog(@"button tapped");
    else{
        was_dragged = NO;
        NSLog(@"button dragged");
    }
}

瞧。 完成。

Answer 3:

使用类似的UIButton的UIControlEventTouchDragInside和UIControlEventTouchUpInside事件

// add drag listener
[button addTarget:self action:@selector(wasDragged:withEvent:) forControlEvents:UIControlEventTouchDragInside];
// add tap listener
[button addTarget:self action:@selector(wasTapped:) forControlEvents:UIControlEventTouchUpInside];

您可以使用HBDraggableButton控制..

文章来源: Touch and drag a UIButton around, but don't trigger it when releasing the finger