iOS 手势

1.解决了防止点击小的view也触发的问题（在大的view上有个小的view，手势添加在大的view上面）

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
 
    if ([touch.view isDescendantOfView:self.smallView]) {
        return NO;
    }
    return YES;
}