Xcode 11.4。导航的标题颜色从情节提要中变为黑色

我最近将Xcode更新为11.4。当我在设备上运行该应用程序时，我注意到从情节提要中设置时，我所有导航项目的标题都变成了黑色。

您无法从代码中更改任何内容，下面的代码行不再起作用

self.navigationController?.navigationBar.titleTextAttributes = [.foregroundColor: UIColor.white]

我只使用一些iOS 13东西UINavigationBarAppearance使其工作

@available(iOS 13.0, *)
    private func setupNavigationBar() {
        let app = UINavigationBarAppearance()
        app.titleTextAttributes = [.foregroundColor: UIColor.white]
        app.backgroundColor = Constants.Color.barColor
        self.navigationController?.navigationBar.compactAppearance = app
        self.navigationController?.navigationBar.standardAppearance = app
        self.navigationController?.navigationBar.scrollEdgeAppearance = app

        self.navigationController?.navigationBar.titleTextAttributes = [.foregroundColor: UIColor.white]
    }

有人可以解释一下为什么吗？这是一个关键错误，还是一些新的隐藏功能？

苹果终于在11.4.1版中修复了它

https://developer.apple.com/documentation/xcode_release_notes/xcode_11_4_1_release_notes

这可以通过以下方式使用UINavigationBarAppearance为我修复：自定义应用程序的导航栏

if #available(iOS 13.0, *) {
    let appearance = UINavigationBarAppearance()
    appearance.configureWithOpaqueBackground()
    appearance.backgroundColor = UIColor.black
    appearance.titleTextAttributes = [.foregroundColor: UIColor.white] // With a red background, make the title more readable.
    self.navigationBar.standardAppearance = appearance
    self.navigationBar.scrollEdgeAppearance = appearance
    self.navigationBar.compactAppearance = appearance // For iPhone small navigation bar in landscape.
} else {
    self.navigationBar.barTintColor = UIColor.black
    self.navigationBar.tintColor = UIColor.white
    self.navigationBar.titleTextAttributes = [.foregroundColor: UIColor.white]
}

注意：我将UINavigationController子类化，并且这是从viewWillAppear的重写中调用的。

...或对于AppDelegate，应用范围内：

if #available(iOS 13.0, *) {
    let appearance = UINavigationBarAppearance()
    appearance.configureWithOpaqueBackground()
    appearance.backgroundColor = UIColor.black
    appearance.titleTextAttributes = [
        NSAttributedStringKey.foregroundColor: UIColor.white
    ]

    let buttonAppearance = UIBarButtonItemAppearance()
    buttonAppearance.normal.titleTextAttributes = [.foregroundColor: UIColor.white]
    appearance.buttonAppearance = buttonAppearance

    UINavigationBar.appearance().standardAppearance = appearance
    UINavigationBar.appearance().scrollEdgeAppearance = appearance
    UINavigationBar.appearance().compactAppearance = appearance

    UIBarButtonItem.appearance().tintColor = UIColor.white
} else {
    UINavigationBar.appearance().barTintColor = UIColor.black
    UINavigationBar.appearance().titleTextAttributes = [
        NSAttributedStringKey.foregroundColor: UIColor.white
    ]
    UINavigationBar.appearance().tintColor = UIColor.white

    UIBarButtonItem.appearance().tintColor = UIColor.white
}

...对于AppDelegate，应用范围内，在Objective-C中：

if (@available(iOS 13, *)) {
    UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
    [appearance configureWithOpaqueBackground];
    appearance.backgroundColor = UIColor.whiteColor;
    appearance.titleTextAttributes = titleAttributes;

    UIBarButtonItemAppearance *buttonAppearance = [[UIBarButtonItemAppearance alloc] init];
    buttonAppearance.normal.titleTextAttributes = barButtonItemAttributes;
    appearance.buttonAppearance = buttonAppearance;

    UINavigationBar.appearance.standardAppearance = appearance;
    UINavigationBar.appearance.scrollEdgeAppearance = appearance;
    UINavigationBar.appearance.compactAppearance = appearance;

    [[UINavigationBar appearance] setTintColor:UIColor.blackColor];
} else {
    [[UINavigationBar appearance] setBarTintColor:UIColor.whiteColor];
    [[UINavigationBar appearance] setTintColor:UIColor.blackColor];
    [[UINavigationBar appearance] setTranslucent:false];
    [[UINavigationBar appearance] setTitleTextAttributes: titleAttributes];
    [[UIBarButtonItem appearance] setTitleTextAttributes:barButtonItemAttributes forState:UIControlStateNormal];
}

在情节提要上，对于导航控制器，将“ Bar Tint”更改为“ Default”值，然后在代码上可以像往常一样更改它。

不确定是否是错误。

我们解决问题的方法是在项目设置中将“状态栏样式”设置为暗或亮。这将强制以某种方式显示状态栏文本的颜色，而不是根据处于亮或暗模式下的设备来确定颜色。

此外，您需要在Info.plist中将“基于View Controller的状态栏外观”值设置为“ NO”。没有该值，“状态栏样式”将被覆盖。

接下来，创建一个自定义导航控制器，并在情节提要中实现它。

class CustomNavigationController: UINavigationController {

 override func viewDidLoad() {
    super.viewDidLoad()
    setNavBar()
 }

 func setNavBar() {
    if #available(iOS 13.0, *) {
        let appearance = UINavigationBarAppearance()
        appearance.configureWithOpaqueBackground()
        appearance.backgroundColor = UIColor.blue
        appearance.titleTextAttributes = [.foregroundColor: UIColor.yellow]
        self.navigationBar.standardAppearance = appearance
        self.navigationBar.scrollEdgeAppearance = appearance
        self.navigationBar.compactAppearance = appearance
    } else {
        self.navigationBar.barTintColor = UIColor.blue
        self.navigationBar.titleTextAttributes = [.foregroundColor: UIColor.yellow]
    }
  }
}

*设置了颜色，以便您可以清楚地看到它们的工作状态。

我发现最好在ViewDidLoad中设置代码，而不是在ViewDidAppear中设置代码，因为只有在向后导航并重新加载后，才在初始加载时未设置颜色。

我还发现此问题可能与NavBar的“ Bar Tint”有关。当我们第一次尝试解决它时，我们将“ Bar Tint”设置为默认值，这似乎也解决了该错误。但是，它做到了，因此我们无法获得所需的NavBar背景色。因此，在我的情节提要中，我确保将此值设置为default只是为了很好。

希望能帮助到你

不需要解决方法。这是Xcode Interface Builder中的错误。Apple发布Xcode 11.4.1更新

Apple开发人员发行说明中的​​内容

界面生成器

修复了导致使用Xcode 11.4生成时在情节提要和XIB文档中设置的某些UINavigationBar外观属性被忽略的问题。（60883063）（FB7639654）

https://developer.apple.com/documentation/xcode_release_notes/xcode_11_4_1_release_notes

与Stu Carney在3/25上的回应类似，我添加了更多实现细节。

创建UINavigationController的子类。将以下内容添加到viewWillAppear中：

let isDarkMode = UserDefaults.standard.bool(forKey: "DarkMode")
let titleColor: UIColor = isDarkMode ? .white : .black
let navBarColor: UIColor = isDarkMode ? .black : .white
let tintColor: UIColor = isDarkMode ? .yellow : .red  //back button text and arrow color, as well as right bar button item

if #available(iOS 13.0, *) {
    let appearance = UINavigationBarAppearance()
    appearance.configureWithOpaqueBackground()
    appearance.backgroundColor = navBarColor
    appearance.titleTextAttributes = [.foregroundColor: titleColor]
    appearance.largeTitleTextAttributes = [.foregroundColor: titleColor]

    self.navigationBar.standardAppearance = appearance
    self.navigationBar.scrollEdgeAppearance = appearance
    self.navigationBar.compactAppearance = appearance // For iPhone small navigation bar in landscape.

    self.navigationBar.tintColor = tintColor //changes back button text and arrow color, as well as right bar button item
} else {
    self.navigationBar.barTintColor = navBarColor
    self.navigationBar.tintColor = tintColor
    self.navigationBar.titleTextAttributes = [.foregroundColor: titleColor]
    self.navigationBar.largeTitleTextAttributes = [.foregroundColor: titleColor]
}

然后覆盖preferredStatusBarStyle：

override var preferredStatusBarStyle: UIStatusBarStyle {
    let isDarkMode = UserDefaults.standard.bool(forKey: "DarkMode")
    return isDarkMode ? .lightContent : .default
}

如果要动态更新导航栏和状态栏（例如，通过UISwitch IBAction或选择器方法），请添加以下内容：

navigationController?.loadView()
navigationController?.topViewController?.setNeedsStatusBarAppearanceUpdate()

另外，请确保将所有导航栏和导航栏按钮设置为IB中的默认颜色。Xcode似乎存在一个错误，其中IB颜色覆盖了以编程方式设置的颜色。

就我而言，在将Xcode从11.3升级到11.4之后，就会发生此错误。因此，为了将图像设置为导航栏中的背景，我必须更改代码以使其无效。

if #available(iOS 13.0, *) {
    let appearance = UINavigationBarAppearance()
    appearance.configureWithOpaqueBackground()
    let backgroundImage = UIImage(named: "{NAVBAR_IMAGE_NAME}")?.resizableImage(withCapInsets: UIEdgeInsets.zero, resizingMode: .stretch)
    appearance.backgroundImage = backgroundImage
    self.navigationController?.navigationBar.compactAppearance = appearance
    self.navigationController?.navigationBar.standardAppearance = appearance
    self.navigationController?.navigationBar.scrollEdgeAppearance = appearance        
} else {
    self.navigationController?.navigationBar.barTintColor = Utils.themeColor
    let backgroundImage = UIImage(named: "{NAVBAR_IMAGE_NAME}")?.resizableImage(withCapInsets: UIEdgeInsets.zero, resizingMode: .stretch)
    self.navigationController?.navigationBar.setBackgroundImage(backgroundImage, for: .default)
    self.navigationController?.navigationBar.shadowImage = UIImage()
}