如何禁掉UIScrollView里的UIPanGestureRecognizer

举例说明：
首先添加手势识别，并给手势识别指定代理
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UIPanGestureRecognizer* panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:selfaction:@selector(handlePanGesture:)];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelaysTouchesBegan:TRUE];
[panRecognizer setDelaysTouchesEnded:TRUE];
[panRecognizer setCancelsTouchesInView:TRUE];
//为手势识别器设置代理
panRecognizer.delegate = self;
[self.view addGestureRecognizer:panRecognizer];
[panRecognizer release];
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然后，实现UIGestureRecognizerDelegate的方法：
// 当拖动UISlider时会被误认为是手势，所以在这个判断一下
-(BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer shouldReceiveTouch:(UITouch*)touch {
if([touch.view isKindOfClass:[UISlider class]])
return NO;
else
return YES;
}