为什么在我第一次加载视图控制器时禁用了TabBar按钮？

| 我有一个iPhone应用程序，可以在两个标签栏之间切换。问题是在交换标签栏的视图中，只有在第一次加载视图时（调用loadView和viewDidLoad时），标签栏按钮才被禁用。换句话说，如果我导航到该视图，则标签栏按钮将被禁用。如果我从该视图导航到某个内容然后弹出，则按钮已启用。视图生命周期调用中的区别是： 工作- loadView viewDidLoad viewWillAppear viewDidAppear 不起作用- viewWillAppear viewDidAppear 现在，交换位于viewDidAppear中。如果将交换放置在viewWillAppear中，则按钮可以正常工作，但视图控制器会跳下，因为在视图过渡动画期间完成了标签栏交换动画。 我的第一个猜测是某些视图位于选项卡栏的顶部。我不认为那是真的。我在两种情况下都打印了视图层次结构，并且只有一个小差异。 这是工作场景的视图层次结构： 
<UIWindow: 0x5a4c7c0; frame = (0 0; 320 480); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x5a4ca30>>
   | <UILayoutContainerView: 0x5a591b0; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x5a59230>>
   |    | <UITransitionView: 0x5a59c00; frame = (0 0; 320 480); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0x5a59ca0>>
   |    |    | <UIViewControllerWrapperView: 0x5a6e960; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x5a6e9e0>>
   |    |    |    | <UILayoutContainerView: 0x5a5bb70; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x5a5bbc0>>
   |    |    |    |    | <UINavigationTransitionView: 0x5a5c290; frame = (0 0; 320 480); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0x5a19400>>
   |    |    |    |    |    | <UIViewControllerWrapperView: 0xaf01810; frame = (0 20; 320 460); layer = <CALayer: 0xaf01840>>
   |    |    |    |    |    |    | <UIView: 0x5abcba0; frame = (0 0; 320 460); layer = <CALayer: 0x5a8ff50>>
   |    |    |    |    |    |    |    | <CaptureAuxMenu: 0x5ac6850; frame = (0 480; 320 49); layer = <CALayer: 0x5ac68e0>>
   |    |    |    |    |    |    |    |    | <UIImageView: 0x5ac6a50; frame = (0 0; 320 49); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5ac6a80>>
   |    |    |    |    |    |    |    |    | <UIButton: 0x5ac67c0; frame = (18 7; 80 31); opaque = NO; layer = <CALayer: 0x5ac6b80>>
   |    |    |    |    |    |    |    |    |    | <UIImageView: 0x5acf910; frame = (0 0; 80 31); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5acf940>>
   |    |    |    |    |    |    |    |    | <UIButton: 0x5ac7ed0; frame = (116 7; 80 31); opaque = NO; layer = <CALayer: 0x5ac7b50>>
   |    |    |    |    |    |    |    |    |    | <UIImageView: 0x5acf890; frame = (0 0; 80 31); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5acf8c0>>
   |    |    |    |    |    |    |    |    | <UIButton: 0x5ac91f0; frame = (285 10; 25 25); opaque = NO; layer = <CALayer: 0x5ac8e70>>
   |    |    |    |    |    |    |    |    |    | <UIImageView: 0x5acf810; frame = (0 0; 25 25); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5acf840>>

   |    | <UITabBar: 0x5a59560; frame = (0 431; 320 480); hidden = YES; autoresize = W+TM; layer = <CALayer: 0x5a59600>>
   |    |    | <UITabBarButton: 0x5a638f0; frame = (2 1; 60 479); opaque = NO; layer = <CALayer: 0x5a660a0>>
   |    |    |    | <UITabBarSelectionIndicatorView: 0x5a6e250; frame = (0 2; 60 475); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a6e280>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a662a0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a66360>>
   |    |    |    | <UITabBarButtonLabel: 0x5a63ba0; frame = (16 465; 28 13); text = \'string\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a63990>>
   |    |    | <UITabBarButton: 0x5a660d0; frame = (66 1; 60 479); opaque = NO; layer = <CALayer: 0x5a674a0>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a663c0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a66410>>
   |    |    |    | <UITabBarButtonLabel: 0x5a66cc0; frame = (16 465; 28 13); text = \'string\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a665e0>>
   |    |    | <UITabBarButton: 0x5a65990; frame = (130 1; 60 479); opaque = NO; layer = <CALayer: 0x5a68140>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a689c0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a68170>>
   |    |    |    | <UITabBarButtonLabel: 0x5a696b0; frame = (16 465; 28 13); text = \'string\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a68ba0>>
   |    |    | <UITabBarButton: 0x5a68420; frame = (194 1; 60 479); opaque = NO; layer = <CALayer: 0x5a697d0>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a6abf0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a6ac40>>
   |    |    |    | <UITabBarButtonLabel: 0x5a6af20; frame = (8 465; 44 13); text = \'FRIENDS\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a678c0>>
   |    |    | <UITabBarButton: 0x5a6a5a0; frame = (258 1; 60 479); opaque = NO; layer = <CALayer: 0x5a6b230>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a6b9b0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a6b260>>
   |    |    |    | <UITabBarButtonLabel: 0x5a677c0; frame = (8 465; 44 13); text = \'PROFILE\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a6b3d0>>
   |    | <UIImageView: 0x5a6b850; frame = (0 480; 320 49); opaque = NO; tag = 89364833; layer = <CALayer: 0x5a6d200>>
   |    |    | <UIButton: 0x5a6d580; frame = (0 0; 64 49); opaque = NO; layer = <CALayer: 0x5a6d660>>
   |    |    |    | <UIImageView: 0x5c35b20; frame = (0 0; 63 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c35b50>>
   |    |    | <UIButton: 0x5a63480; frame = (64 0; 64 49); opaque = NO; tag = 1; layer = <CALayer: 0x5a66170>>
   |    |    |    | <UIImageView: 0x5c35aa0; frame = (0 0; 64 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c35ad0>>
   |    |    | <UIButton: 0x5a6da30; frame = (128 0; 64 49); opaque = NO; tag = 2; layer = <CALayer: 0x5a6dac0>>
   |    |    |    | <UIImageView: 0x5c35a20; frame = (0 0; 64 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c35a50>>
   |    |    | <UIButton: 0x5a6dc60; frame = (192 0; 64 49); opaque = NO; tag = 3; layer = <CALayer: 0x5a6dcf0>>
   |    |    |    | <UIImageView: 0x5c359a0; frame = (0 0; 64 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c359d0>>
   |    |    | <UIButton: 0x5a6de90; frame = (256 0; 64 49); opaque = NO; tag = 4; layer = <CALayer: 0x5a6df20>>
   |    |    |    | <UIImageView: 0x5c358c0; frame = (0 0; 64 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c35970>>
这是失败方案的视图层次结构： 
<UIWindow: 0x5a4c7c0; frame = (0 0; 320 480); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x5a4ca30>>
   | <UILayoutContainerView: 0x5a591b0; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x5a59230>>
   |    | <UITransitionView: 0x5a59c00; frame = (0 0; 320 480); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0x5a59ca0>>
   |    |    | <UIViewControllerWrapperView: 0x5a6e960; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x5a6e9e0>>
   |    |    |    | <UILayoutContainerView: 0x5a5bb70; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x5a5bbc0>>
   |    |    |    |    | <UINavigationTransitionView: 0x5a5c290; frame = (0 0; 320 480); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0x5a19400>>
   |    |    |    |    |    | <UIViewControllerWrapperView: 0x5ae49f0; frame = (0 20; 320 411); layer = <CALayer: 0x5ae4870>>
   |    |    |    |    |    |    | <UIView: 0x5abcba0; frame = (0 0; 320 411); layer = <CALayer: 0x5a8ff50>>
   |    |    |    |    |    |    |    | <CaptureAuxMenu: 0x5ac6850; frame = (0 480; 320 49); layer = <CALayer: 0x5ac68e0>>
   |    |    |    |    |    |    |    |    | <UIImageView: 0x5ac6a50; frame = (0 0; 320 49); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5ac6a80>>
   |    |    |    |    |    |    |    |    | <UIButton: 0x5ac67c0; frame = (18 7; 80 31); opaque = NO; layer = <CALayer: 0x5ac6b80>>
   |    |    |    |    |    |    |    |    |    | <UIImageView: 0x5acf910; frame = (0 0; 80 31); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5acf940>>
   |    |    |    |    |    |    |    |    | <UIButton: 0x5ac7ed0; frame = (116 7; 80 31); opaque = NO; layer = <CALayer: 0x5ac7b50>>
   |    |    |    |    |    |    |    |    |    | <UIImageView: 0x5acf890; frame = (0 0; 80 31); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5acf8c0>>
   |    |    |    |    |    |    |    |    | <UIButton: 0x5ac91f0; frame = (285 10; 25 25); opaque = NO; layer = <CALayer: 0x5ac8e70>>
   |    |    |    |    |    |    |    |    |    | <UIImageView: 0x5acf810; frame = (0 0; 25 25); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5acf840>>

   |    | <UITabBar: 0x5a59560; frame = (0 431; 320 480); hidden = YES; autoresize = W+TM; layer = <CALayer: 0x5a59600>>
   |    |    | <UITabBarButton: 0x5a638f0; frame = (2 1; 60 479); opaque = NO; layer = <CALayer: 0x5a660a0>>
   |    |    |    | <UITabBarSelectionIndicatorView: 0x5a6e250; frame = (0 2; 60 475); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a6e280>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a662a0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a66360>>
   |    |    |    | <UITabBarButtonLabel: 0x5a63ba0; frame = (16 465; 28 13); text = \'string\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a63990>>
   |    |    | <UITabBarButton: 0x5a660d0; frame = (66 1; 60 479); opaque = NO; layer = <CALayer: 0x5a674a0>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a663c0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a66410>>
   |    |    |    | <UITabBarButtonLabel: 0x5a66cc0; frame = (16 465; 28 13); text = \'string\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a665e0>>
   |    |    | <UITabBarButton: 0x5a65990; frame = (130 1; 60 479); opaque = NO; layer = <CALayer: 0x5a68140>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a689c0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a68170>>
   |    |    |    | <UITabBarButtonLabel: 0x5a696b0; frame = (16 465; 28 13); text = \'string\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a68ba0>>
   |    |    | <UITabBarButton: 0x5a68420; frame = (194 1; 60 479); opaque = NO; layer = <CALayer: 0x5a697d0>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a6abf0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a6ac40>>
   |    |    |    | <UITabBarButtonLabel: 0x5a6af20; frame = (8 465; 44 13); text = \'FRIENDS\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a678c0>>
   |    |    | <UITabBarButton: 0x5a6a5a0; frame = (258 1; 60 479); opaque = NO; layer = <CALayer: 0x5a6b230>>
   |    |    |    | <UITabBarSwappableImageView: 0x5a6b9b0; frame = (6 218; 48 32); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a6b260>>
   |    |    |    | <UITabBarButtonLabel: 0x5a677c0; frame = (8 465; 44 13); text = \'PROFILE\'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5a6b3d0>>
   |    | <UIImageView: 0x5a6b850; frame = (0 480; 320 49); opaque = NO; tag = 89364833; layer = <CALayer: 0x5a6d200>>
   |    |    | <UIButton: 0x5a6d580; frame = (0 0; 64 49); opaque = NO; layer = <CALayer: 0x5a6d660>>
   |    |    |    | <UIImageView: 0x5c35b20; frame = (0 0; 63 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c35b50>>
   |    |    | <UIButton: 0x5a63480; frame = (64 0; 64 49); opaque = NO; tag = 1; layer = <CALayer: 0x5a66170>>
   |    |    |    | <UIImageView: 0x5c35aa0; frame = (0 0; 64 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c35ad0>>
   |    |    | <UIButton: 0x5a6da30; frame = (128 0; 64 49); opaque = NO; tag = 2; layer = <CALayer: 0x5a6dac0>>
   |    |    |    | <UIImageView: 0x5c35a20; frame = (0 0; 64 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c35a50>>
   |    |    | <UIButton: 0x5a6dc60; frame = (192 0; 64 49); opaque = NO; tag = 3; layer = <CALayer: 0x5a6dcf0>>
   |    |    |    | <UIImageView: 0x5c359a0; frame = (0 0; 64 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c359d0>>
   |    |    | <UIButton: 0x5a6de90; frame = (256 0; 64 49); opaque = NO; tag = 4; layer = <CALayer: 0x5a6df20>>
   |    |    |    | <UIImageView: 0x5c358c0; frame = (0 0; 64 49); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x5c35970>>
在两种情况下，我可以看到的唯一明显区别是在第7行和第8行。您将看到UIViewControllerWrapperView和子UIView具有不同的框架，但是我不太确定为什么会出现问题，因为我不确定对应的UIView，并且在UIViewControllerWrapperView上找不到任何文档。 我正在使用以下代码交换标签栏： 
- (void)viewDidAppear:(BOOL)animated{ 
    [super viewDidAppear:animated];
    [AppHelpers hideTabBarController:self.tabBarController withHidden:YES];
    [self showCaptureTabBar];
}

+ (void) hideTabBarController:(UITabBarController *)tbc withHidden:(BOOL)hide {

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];

    for(UIView *view in tbc.view.subviews)
    {       
        if([view isKindOfClass:[UIImageView class]])
        {
            if (hide) {
                [view setFrame:CGRectMake(view.frame.origin.x, 480, view.frame.size.width, view.frame.size.height)];
            } else {
                [view setFrame:CGRectMake(view.frame.origin.x, 431, view.frame.size.width, view.frame.size.height)];
            }
        }else {
            if (hide) {
                // When hiding the tabbarcontroller, the view should be full height
                [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, 480)];
            } else {
                // When showing the tabbarcontroller, the view needs to leave 49px of room for it at the bottom
                [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, 431)];
            }
        }
    }

    [UIView commitAnimations];  
}

- (void)showCaptureTabBar {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1];
    [captureTabBar setFrame:CGRectMake(captureTabBar.frame.origin.x, 412.0f, captureTabBar.frame.size.width, captureTabBar.frame.size.height)];
    [UIView commitAnimations];
}
对于为什么可以禁用按钮以便我可以尝试其他调试的任何想法，将不胜感激。金田在这里撞墙     
2020-02-05 3 条评论
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没有找到相关结果

    已邀请:

    茶鬼失形

            如果包装视图较小，则肯定会引起问题。特别是如果包装小于包装中的所有UI元素。 UIViews仍然可以显示超出其框架的元素，但用户交互不会超出其框架。 若要查看是否存在此问题，请尝试在包装器上将\“ Clip Subviews \”的属性设置为YES，然后查看是否仍然可以看到工具栏。如果看不到工具栏，则应将包装器做大一些，以便整个工具栏都可以与用户互动。     
    2020-02-05 0 0
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    呈辖玫割善

            在单个beginAnimations / endAnimations上下文中进行隐藏/显示怎么办？ 
    - (void)viewDidAppear:(BOOL)animated{ 
 [super viewDidAppear:animated];

 [UIView beginAnimations:@\"firstAnimation\" context:NULL];
 [UIView setAnimationDuration:0.3];
 [AppHelpers hideTabBarController:self.tabBarController withHidden:YES];

 [UIView beginAnimations:@\"secondAnimation\" context:NULL];
 [UIView setAnimationDuration:1.0];
 [self showCaptureTabBar];

 [UIView commitAnimations];
 [UIView commitAnimations];

}
    你有尝试过吗？当然，您应该从这两种方法中删除动画。 通过这种方式，我们可以嵌套两个动画... 旧答案： 我不知道这是否有帮助，但是为什么您不尝试隐藏/显示设置
    hidden
    属性的子视图呢？ 
            if (hide) {
            view.hide = YES;
        } else {
            view.hide = NO;
        }
    最后，如果这不起作用，可能会发生以下情况（但是我不知道它是否起作用）：在
    viewWillAppear
    中进行交换，但不要依次调用
    hideTabBarController
    和
    showCaptureTabBar
    ；而是尝试以0的延迟计划第二种执行方法（这意味着执行
    hideTabBarController
    ，然后在控制流回到主循环时执行
    showCaptureTabBar
    ）： 
    [AppHelpers hideTabBarController:self.tabBarController withHidden:YES];
[self performSelector:@selector(showCaptureTabBar) withObject:nil afterDelay:0];
    实际上，由于“ 7”动画持续0.3秒，因此您可以指定0.3的延迟，以防万一这是因为两个动画相互干扰而导致的。     
    2020-02-05 0 0
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