UIScrollView嵌套不影响彼此的手势

底层UIScrollView重写以下代理

@interface YDScrollView : UIScrollView
<UIGestureRecognizerDelegate>

@end

@implementation YDScrollView

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

@end