UITabBarController 中的 UINavigationController 奇怪的弹出动画

Posted 2023-02-24

【中文标题】UITabBarController 中的 UINavigationController 奇怪的弹出动画

【英文标题】：UINavigationController in UITabBarController strange pop animation

【发布时间】：2013-01-09 17:18:53

【问题描述】：

当我创建四个导航控制器并将它们添加到 UITabBar 时：

// Create the root view controllers for the tab bar
firstViewController = [[FirstViewController alloc] init];
secondViewController = [[SecondViewController alloc] init];
thirdViewController = [[ThirdViewController alloc] init];
fourthViewController = [[FourthViewController alloc] init];

// Configure the tab bar
UITabBarController *tabBarController = [[[UITabBarController alloc] init] autorelease];
tabBarController.viewControllers = @[
[[[UINavigationController alloc] initWithRootViewController:firstViewController] autorelease],
[[[UINavigationController alloc] initWithRootViewController:secondViewController] autorelease],
[[[UINavigationController alloc] initWithRootViewController:thirdViewController] autorelease],
[[[UINavigationController alloc] initWithRootViewController:fourthViewController] autorelease]
];
tabBarController.selectedIndex = 1;

self.window.rootViewController = tabBarController;

我遇到了一个问题，即哪个 UINavigationController 在启动时首次可见（在本例中为索引 1）有一个奇怪的“弹出”动画。导航栏中的标题等动画正常，但导航控制器的内容更改时没有动画。

选择一个不同的选项卡，然后返回到原来的选项卡可以解决问题。

另外，如果我将self.window.rootViewController 设置为[[[UINavigationController alloc] initWithRootViewController:secondViewController] autorelease] 以便将标签栏排除在等式之外，导航控制器就可以正常工作。

有什么想法吗？

【参考方案1】：

我遇到了同样的问题，我找到的唯一解决方案就是这个小技巧：

把它放在第一个 UITabBarController 视图控制器上的“(void)viewWillAppear”方法中。

     UITabBarController * controller = self.tabBarController;
     //Create this BOOL variable on your class and set it to YES on viewDidLoad
     if(firstTimeViewLoaded)     
        // Simulate a click on other tab item then switch back instantly.
        [controller setSelectedViewController:controller.viewControllers[1]];
        [controller setSelectedViewController:controller.viewControllers[0]];
     
     firstTimeViewLoaded = NO;

【参考方案2】：

我遇到了同样的问题并找到了解决方案，所以对于那些在谷歌搜索时偶然发现此页面的人：

来自Pop animation is not working in first UINavigationController of UITabbarController：

您可能忘记在-(void)viewDidAppear:(BOOL)animated 方法中写入[super viewDidAppear:animated];：

-(void)viewDidAppear:(BOOL)animated
    [super viewDidAppear:animated];

这应该可以解决它。

【参考方案3】：

 // Create the root view controllers for the tab bar
firstViewController = [[FirstViewController alloc] init];
secondViewController = [[SecondViewController alloc] init];
thirdViewController = [[ThirdViewController alloc] init];
fourthViewController = [[FourthViewController alloc] init];

   UINavigationController *myNavigationController;
    UITabBarController *myTabBarController = [[UITabBarController alloc] init];

    NSMutableArray *myTabs = [[NSMutableArray alloc] init];

    myNavigationController = [[UINavigationController alloc] initWithRootViewController:firstViewController];
    [myTabs addObject:myNavigationController];
//Release
[myNavigationController release];
//Second view
    myNavigationController = [[UINavigationController alloc] initWithRootViewController:secondViewController];
    [myTabs addObject:myNavigationController];
[myNavigationController release];
//And so on with the third and fourth view controller
//...

[tabBarController setViewControllers:myTabs];
//Add the tab bar controller view to the main view
[self.window addSubview:tabBarController.view];