iphone – 如何将触摸事件从UIView传递到它下面的UIView？

uiview的子类
并添加

-(id)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *hitView = [super hitTest:point withEvent:event];
    if (hitView == self){
        return nil;
    }
    else {
        return hitView;
    }
}