父view中添加手勢子view不響應的問題解決

//父類view
    UIImageView *back = [[UIImageViewalloc]initWithFrame:CGRectMake(0,0,kScreenWidth,kScreenHeight)];
    back.image= [UIImageimageNamed:@"Default-568h@2x"];
    back.userInteractionEnabled= YES;
    [self.viewaddSubview:back];
   
    // 父類view中的imageView
    imageView = [[UIImageViewalloc]initWithFrame:CGRectMake(100,100,100,100)];
    imageView.image= [UIImageimageNamed:@"Default-568h@2x"];
    imageView.userInteractionEnabled= YES;
   
    // 父類view中的label
    label = [[UILabelalloc]initWithFrame:CGRectMake(100,240,100,100)];
    label.text= @"label";
    label.backgroundColor= [UIColorgrayColor];
    // 此屬性必須打開,不然UITouch捕獲Label
    label.userInteractionEnabled= YES;
   
    // 父類view中的button
    button = [UIButtonbuttonWithType:UIButtonTypeCustom];
    [buttonsetTitle:@"button"forState:UIControlStateNormal];
    button.frame= CGRectMake(100,350,100,100);
    button.backgroundColor= [UIColorpurpleColor];
    [buttonaddTarget:selfaction:@selector(btn)forControlEvents:UIControlEventTouchUpInside];

   
    UITapGestureRecognizer *tap = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(tap:)];
    tap.delegate= self;

    [back addGestureRecognizer:tap];
    [back addSubview:imageView];
    [back addSubview:label];
    [back addSubview:button];
}
- (void)btn
{
    NSLog(@"button");

}

- (BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer shouldReceiveTouch:(UITouch*)touch
{
    // 取消label和imageview響應手勢
    if ([touch.viewisKindOfClass:[UILabelclass]] || touch.view== imageView)
    {
        return NO;
    }
    return YES;

}
- (void)tap:(UITapGestureRecognizer*)tap
{
    NSLog(@"tap.view = %@",tap.view);
}