有没有办法通过 UITapGestureRecognizer 发送对象？

Question

我有一个从 UIView 类型的类创建的对象，以生成无限数量的视图，然后这些视图以较小的尺寸出现在屏幕中间。我使用 UITapGestureRecognizer 来放大其中一个视图以适应屏幕，但这里的问题是该对象只能在第一类中使用，不能转移到第二类，即选择器。 您对这个特定问题有什么建议？ 如何将我的对象发送到选择器以便能够在那里使用它？ 谢谢

这是创建对象的第一个类（从 iCarousel 派生）：

- (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view
{
    UILabel *label = nil;
    UIButton *close = [UIButton buttonWithType:UIButtonTypeRoundedRect];


    //create new view if no view is available for recycling
    if (view == nil)
    {


        view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320.0f, 460.0f)];
        view.contentMode = UIViewContentModeCenter;

        view.backgroundColor = [UIColor whiteColor];

        label = [[UILabel alloc] initWithFrame:CGRectMake(100, -100, 100, 100)];
        label.backgroundColor = [UIColor clearColor];
        label.textAlignment = NSTextAlignmentCenter;
        label.font = [label.font fontWithSize:50];
        label.tag = 1;
        [view addSubview:label];

        close.frame = CGRectMake(0, 0, 30, 30);
        [close setTitle:@"x" forState:UIControlStateNormal];
        close.titleLabel.font = [UIFont systemFontOfSize:25];
        [close addTarget:self action:@selector(closeMe:) forControlEvents:UIControlEventTouchUpInside];

        [view addSubview:close];


        UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapToMaximize:)];
        tap.numberOfTapsRequired = 1;
        [view addGestureRecognizer:tap];

    }
    else
    {

        //get a reference to the label in the recycled view
        label = (UILabel *)[view viewWithTag:1];

    }


    label.text = [items[index] stringValue];

    return view;
}

还有选择器：

- (void)tapToMaximize:(UITapGestureRecognizer*)recognizer {

    [UIView animateWithDuration:0.3
                          delay:0
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
                         carousel.transform = CGAffineTransformMakeScale(1, 1);

                     }
                     completion:^(BOOL finished) {
                     }];

}

所以我不想使用代表所有视图的“轮播”，而是使用“视图”，这样我只能放大当前视图而不是所有视图。

Answer 1

UITapGestureRecognizer 继承了 UIGestureRecognizer 的 view 属性，您可以使用它来放大该点击手势识别器的视图：

- (void)tapToMaximize:(UITapGestureRecognizer*)recognizer {

    UIView *viewToMaximize;
    if ([recognizer.view isEqual:_maximizedView]) {
        viewToMaximize = nil;
    } else {
        viewToMaximize = recognizer.view;
    }
    UIView *viewToUnmaximize = _maximizedView; // _maximizedView should be an instance variable on your view controller

    [UIView animateWithDuration:0.3
                          delay:0
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
                         viewToMaximize.transform = CGAffineTransformMakeScale(1.1, 1.1);
                         viewToUnmaximize.transform = CGAffineTransformIdentity;
                     }
                     completion:^(BOOL finished) {
                     }];

    _maximizedView = viewToMaximize;
}

另外，CGAffineTransformMakeScale(1, 1) 会将视图缩放到其原始大小，所以我在我的代码 sn-p 中提高了比例。

Answer 2

如果我理解正确，您想转换您点击的 UIView，应该是轮播？

假设您将点击手势识别器添加到 self.view，那么这就是您获得刚刚点击的视图的方式：

- (void)tapToMaximize:(UITapGestureRecognizer*)recognizer
{
    UIView *view = [self.view hitTest:[recognizer locationInView:self.view] withEvent:nil];
    // you can now check to see if this view is the carousel
}

一旦您知道您是否点击了轮播，您就可以将其存储、传递给另一个班级、对其进行转换或任何您喜欢的方式。