@property(nonatomic) NSUInteger maximumNumberOfTouches//The maximum number of fingers that can be touching the view for this gesture to be recognized.@property(nonatomic) NSUInteger minimumNumberOfTouches//The minimum number of fingers that can be touching the view for this gesture to be recognized.

- (CGPoint)translationInView:(UIView *)view//The translation of the pan gesture in the coordinate system of the specified view.平移的距离。设置后速度为0.- (void)setTranslation:(CGPoint)translation inView:(UIView *)view//设置平移的距离- (CGPoint)velocityInView:(UIView *)view//速度。 which is expressed in points per second.

    CGFloat translationX = [pan translationInView:self.view].x;    pan.view.center = CGPointMake(pan.view.center.x+translationX, pan.view.center.y);    [pan setTranslation:CGPointZero inView:self.view];

CGPoint translation = [recognizer translationInView:recognizer.view];case UIGestureRecognizerStateBegan: {            [recognizer setTranslation:CGPointMake(recognizer.view.frame.origin.x, 0) inView:recognizer.view];            break;        }        case UIGestureRecognizerStateChanged: {            [recognizer.view setTransform:CGAffineTransformMakeTranslation(MAX(0,translation.x), 0)];                        [self statusBarView].transform = recognizer.view.transform;            break;        }