我试图在UIButton上实现拖放功能&,它工作正常,但我找不出一种方法来确定用户何时放开按钮,完成拖动。下面的代码适用于拖动,但我需要在用户完成拖动并释放按钮时收到通知。检测UIButton事件何时完成
- (void)viewDidLoad
{
[gesturesBrowserButton addTarget:self action:@selector(wasDragged:withEvent:)
forControlEvents:UIControlEventTouchDragInside];
[gesturesBrowserButton addTarget:self action:@selector(finishedDragging:withEvent:)
forControlEvents:UIControlEventTouchDragExit];
}
- (void)wasDragged:(UIButton *)button withEvent:(UIEvent *)event
{
// get the touch
UITouch *touch = [[event touchesForView:button] anyObject];
// get delta
CGPoint previousLocation = [touch previousLocationInView:button];
CGPoint location = [touch locationInView:button];
CGFloat delta_x = location.x - previousLocation.x;
CGFloat delta_y = location.y - previousLocation.y;
// move button
button.center = CGPointMake(button.center.x + delta_x,
button.center.y + delta_y);
NSLog(@"was dragged");
}
- (void)finishedDragging:(UIButton *)button withEvent:(UIEvent *)event
{
//doesn't get called
NSLog(@"finished dragging");
}
啊,这个诀窍:)谢谢 – Snowman 2012-01-30 17:49:47
如果用户拖入控件然后退出,是不是'UIControlEventTouchDragExit'?我假设你不想要那个。“ – 2012-01-30 18:03:23