UIControl和UIView的事件传递有关问题

UIControl和UIView的事件传递问题

对于UIControl子类中的

- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event

和

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

传递中子类监听touchbegin，传递回来给UIControl子类，UIControl子类只能监听对于的touchesBegan，而没有触发beginTracking.

解决方案：

在UIControl子类调用

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"my control touch begin");
    [super touchesBegan:toucheswithEvent:event];
    UITouch* touch = [touches anyObject];
    // Track the touch
    [self beginTrackingWithTouch:touch withEvent:event];
}
- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
    [super touchesMoved:toucheswithEvent:event];
    // Get the only touch (multipleTouchEnabled is NO)
    UITouch* touch = [touches anyObject];
    // Track the touch
    [self continueTrackingWithTouch:touch withEvent:event];
}

....end