ios tabBarControl、navigationcontroller 标题和按钮编辑

Posted 2023-02-23

【中文标题】ios tabBarControl、navigationcontroller 标题和按钮编辑

【英文标题】：ios tabBarControl, navigationcontroller title and button editing

【发布时间】：2014-05-06 18:41:48

【问题描述】：

我一直在我的应用程序中使用标准的 TabBarController 和顶部 NavigationBar。 tabBar 在 appDelegate 中加载，初始化 navigationBar 以使用图像而不是中心标题，这适用于所有四个 tabBar 视图。偶尔我会将一个新视图推送到视图控制器上，效果很好。

我想做的是能够在打开 4 个 tabBar 视图控制器时更改它们中的每一个的 NavigationBar。我很难做到这一点。我的初始导航栏有一个图像，加载在 appDelegate 中。我的问题是：

每个 viewController 通常是否应该根据需要在各自的 viewWillAppear 方法中从头开始创建一个新的 navigationBar？ 应该编辑哪些navigationController 和navigationBar——总是appDelegate 的navigationController、tabBarController.navigationController，或者只是每个视图中的self.navigationController？ （通常，大多数编辑对我不起作用，不会发生任何更改） 如果我用 imageView 覆盖标准标题（通常是 tabBar 的当前视图的标题），并希望另一个 tabBar 视图使用标准标题，我应该如何删除 titleView 图像，并重置回文本？反之亦然，取决于视图？这就是我真正想要实现的目标，但没有成功。

我想我正在寻找管理每个视图的导航栏的标准做法，并为每个 tabBarItem 更改它。

// in appDelegate
- (void)initNav 
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.delegate = self;
    self.tabBarController.navigationController.view.backgroundColor = [UIColor whiteColor];

    self.tabBarController.viewControllers = [NSArray arrayWithObjects:self.firstViewController,
                                             self.secondViewController,
                                             self.thirdViewController,
                                             self.forthViewController,
                                             nil];


    [self.window addSubview:self.tabBarController.view];
    self.navigationController = [[UINavigationController alloc] initWithRootViewController:self.tabBarController];
    self.navigationController.navigationBarHidden = NO;

    // customize background color of nav bar to "blue"ish color
    self.navigationController.navigationBar.backgroundColor = [UIColor colorWithHexString:@"00A3E1"];
    self.navigationController.navigationBar.tintColor = [UIColor colorWithHexString:@"00A3E1"];
    self.navigationController.navigationBar.barTintColor = [UIColor colorWithHexString:@"00A3E1"];

    [self createNavs];


// also in appDelegate
- (void)createNavs 
    // white text when present
    NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                [UIColor whiteColor],
                                UITextAttributeTextColor,
                                [UIColor clearColor],
                                UITextAttributeTextShadowColor, nil];

    [[UIBarButtonItem appearance] setTitleTextAttributes: attributes
                                                forState: UIControlStateNormal];


    AppDelegate *delegateRef = (AppDelegate*)[[UIApplication sharedApplication] delegate];

    [self.navigationController.navigationBar setTranslucent:NO];

    // setup left button (currently unused -- no left button)
    /*
    /*
    UIButton *button =  [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:[UIImage imageNamed:@"glyphicons_049_star.png"] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(starClick:) forControlEvents:UIControlEventTouchDown];
    [button setFrame:CGRectMake(0, 0, 25, 25)];
    self.navigationController.navigationBar.topItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    */

    // setup logo in center
    self.tabBarController.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"synced_top_logo.png"]];

    // setup right button (currently unused -- no right button)
    /*
    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] init];
    rightButton.title = @"edit";
    [rightButton setTarget:self ];
    [rightButton setAction:@selector(editClick:)];
    self.navigationController.navigationBar.topItem.rightBarButtonItem = rightButton;
    */

    [[self navigationController] setNavigationBarHidden:NO animated:YES];
    [[delegateRef navigationController] setNavigationBarHidden:NO animated:YES];

编辑： 这是下面发布的解决方案的简化版本，它很有帮助，并允许进行所需的自定义。每个视图控制器都独立于此自定义其导航栏。大概从一开始就应该这样做。

tabBarController.viewControllers = [NSArray arrayWithObjects:[[UINavigationController alloc] initWithRootViewController:self.firstViewController], 
                                         [[UINavigationController alloc] initWithRootViewController:self.secondViewController],
                                         [[UINavigationController alloc] initWithRootViewController:self.thirdViewController],
                                         [[UINavigationController alloc] initWithRootViewController:self.forthViewController],
                                         nil];

【问题讨论】：

所以让我明白这一点。你有一个 UITabBarController 包裹在 UINavigationController 中？因此，在显示UITabBarController 的第一个视图中，当您推送到新的UIViewController 时，您希望UITabBarController 选项卡栏消失吗？我问是因为这不是使用UITabBarController 时的惯例。您不应将 UITabBarController 包装在 UINavigationController 中。

@Miro，只是一个疯狂的猜测，但你是否尝试过阅读

@random，这似乎是正在发生的事情。我相信我最初这样做是因为导航栏最初将是 100% 静态的。现在它已经达到了极限。什么是最好的方法，每个 ViewController 添加到 TabBarController 的 NavigationController？他们现在需要独特的标题 + 按钮，有些人会推送其他视图。

【参考方案1】：

这可能是你需要的：

- (void)initTabbar 

    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.delegate = self;

    /*
     You want each of your UIViewControllers to be wrapped in a UINavigationController. Then put each of those UINavigationControllers in a UITabBarController
    */

    //You don't need to hang on to this becuase the proceeding UINavigationController will handle it
    FirstViewController *firstViewController = [[FirstViewController alloc] ...];

    //You'll need to declare this in your header
    self.firstNavigationController = [[UINavigationController alloc] initWithRootViewController:firstViewController];


    //Second view allocation
    SecondViewController *secondViewController = [[SecondViewController alloc] ...];
    self.secondNavigationController = [[UINavigationController alloc] initWithRootViewController:secondViewController];

    //Third view allocation
    ThirdViewController *thirdViewController = [[ThirdViewController alloc] ...];
    self.thirdNavigationController = [[UINavigationController alloc] initWithRootViewController:thirdViewController];


    //Now you add each of the UINavigationControllers (which is a subclass of UIViewController) to the UITabBarController.
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:self.firstNavigationController,
                                             self.secondNavigationController,
                                             self.thirdNavigationController,
                                             nil];


    [self.window addSubview:self.tabBarController.view];

    [self createNavs];


//This is more of a 'formatNavs' now
- (void)createNavs 

    //Now you can customize each of the UINavigationController's UINavigationBars seperatly
    self.firstNavigationController.navigationBar.backgroundColor    = [UIColor colorWithHexString:@"00A3E1"];
    self.firstNavigationController.navigationBar.tintColor          = [UIColor colorWithHexString:@"00A3E1"];
    self.firstNavigationController.navigationBar.barTintColor       = [UIColor colorWithHexString:@"00A3E1"];

    self.secondNavigationController.navigationBar.backgroundColor   = [UIColor colorWithHexString:@"...."];
    self.secondNavigationController.navigationBar.tintColor         = [UIColor colorWithHexString:@"...."];
    self.secondNavigationController.navigationBar.barTintColor      = [UIColor colorWithHexString:@"...."];

    self.thirdNavigationController.navigationBar.backgroundColor    = [UIColor colorWithHexString:@"...."];
    self.thirdNavigationController.navigationBar.tintColor          = [UIColor colorWithHexString:@"...."];
    self.thirdNavigationController.navigationBar.barTintColor       = [UIColor colorWithHexString:@"...."];

【讨论】：

非常好。我在上面添加了一个编辑，它简化了相同的逻辑，但每个选项卡都有自己的 navigationController 堆栈。