参考
https://www.jianshu.com/p/5e86f900b3cc

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
    UIView *view = [super hitTest:point withEvent:event];
    
    CGPoint tempPoint = [self.editBtn convertPoint:point fromView:self];
    
    if([self.editBtn pointInside:tempPoint withEvent:event])
    {
        return self.editBtn;
    }
    
    return view;
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event;

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    return ([super pointInside:point withEvent:event]
            || CGRectContainsPoint(_tipView.frame, point)
            );
}