ios – touchesBegan,touchesEnded,touchesMoved移动UIView

float oldX,oldY;
BOOL dragging;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLOCATIOn = [touch LOCATIOnInView:self];

    if ([[touch.view class] isSubclassOfClass:[UILabel class]]) {
        UILabel *label = (UILabel *)touch.view;
        if (CGRectContainsPoint(label.frame,touchLOCATIOn)) {
            dragging = YES;
            oldX = touchLOCATIOn.x;
            oldY = touchLOCATIOn.y;
        }
    }


}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    dragging = NO;
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLOCATIOn = [touch LOCATIOnInView:self];

    if ([[touch.view class] isSubclassOfClass:[UILabel class]]) {
        UILabel *label = (UILabel *)touch.view;

        if (dragging) {
            CGRect frame = label.frame;
            frame.origin.x = label.frame.origin.x + touchLOCATIOn.x - oldX;
            frame.origin.y =  label.frame.origin.y + touchLOCATIOn.y - oldY;
            label.frame = frame;
        }

    }


}