UIbutton随手指移动

[view_button addTarget:self action:@selector(dragBegan:withEvent: )
             forControlEvents: UIControlEventTouchDown];
[view_button addTarget:self action:@selector(dragMoving:withEvent: )
                forControlEvents: UIControlEventTouchDragInside];
[view_button addTarget:self action:@selector(dragEnded:withEvent: )
                forControlEvents: UIControlEventTouchUpInside | UIControlEventTouchUpOutside];
 
 
 
- (void) dragBegan: (UIControl *) c withEvent:ev
 
 
{
NSLog(@"Button  moving bagin ......");
 
}
 
 
- (void) dragMoving: (UIControl *) c withEvent:ev
{
NSLog(@"Button  is moving ..............");
    UIButton *bt = (UIButton *)c;
    c.center = [[[ev allTouches] anyObject] locationInView:self.view];
}
- (void) dragEnded: (UIControl *) c withEvent:ev
{
NSLog(@"Button  moving end..............");
    UIButton *bt = (UIButton *)c;
    c.center = [[[ev allTouches] anyObject] locationInView:self.view];
}