ios 13上的导航栏标题字体问题

我使用的是Xcode 11.4和iOS 13.4。 我已使用UINavigatinBar.appearance设置了导航栏标题自定义字体 它工作正常，但在iOS 13+上，当我尝试推送到另一个VC，然后返回到父VC时，父VC标题字体突然被设置为默认字体，一秒钟后又变回自定义字体

以下是问题的gif：

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在这里，在ViewDidDisplay中管理它：

let lblTitle = UILabel()

let titleAttribute: [NSAttributedString.Key: Any] = [.font: UIFont.boldSystemFont(ofSize: 21),
                                                .foregroundColor: UIColor.black]

let attributeString = NSMutableAttributedString(string: "Navigation Title", attributes: titleAttribute)

lblTitle.attributedText = attributeString

lblTitle.sizeToFit()
navigationItem.titleView = lblTitle

---

在这里，在ViewDidDisplay中管理它：

let lblTitle = UILabel()

let titleAttribute: [NSAttributedString.Key: Any] = [.font: UIFont.boldSystemFont(ofSize: 21),
                                                .foregroundColor: UIColor.black]

let attributeString = NSMutableAttributedString(string: "Navigation Title", attributes: titleAttribute)

lblTitle.attributedText = attributeString

lblTitle.sizeToFit()
navigationItem.titleView = lblTitle

iOS 13.+采用UINavigationBarAppearance方法定制导航栏标题和导航栏按钮

检查此代码，可能会对您有所帮助

    let titleFontAttrs = [ NSAttributedString.Key.font: UIFont(name: "custom-font-name", size: 20)!, NSAttributedString.Key.foregroundColor: UIColor.white ]
    let barButtonFontAttrs = [ NSAttributedString.Key.font: UIFont(name: "custom-font-name", size: 14)! ]

    UINavigationBar.appearance().tintColor = UIColor.white // bar icons

    if #available(iOS 13.0, *) {
        let appearance = UINavigationBarAppearance()
        appearance.backgroundColor = .red // If you want different nav background color other than white

        appearance.titleTextAttributes = titleFontAttrs
        appearance.largeTitleTextAttributes = titleFontAttrs // If your app supports largeNavBarTitle

        UINavigationBar.appearance().isTranslucent = false

        appearance.buttonAppearance.normal.titleTextAttributes = barButtonFontAttrs
        appearance.buttonAppearance.highlighted.titleTextAttributes = barButtonFontAttrs

        UINavigationBar.appearance().standardAppearance = appearance
        UINavigationBar.appearance().compactAppearance = appearance
        UINavigationBar.appearance().scrollEdgeAppearance = appearance
    } else {
        UINavigationBar.appearance().barTintColor = .red // bar background

        UINavigationBar.appearance().titleTextAttributes = titleFontAttrs

        UINavigationBar.appearance().isTranslucent = false

        UIBarButtonItem.appearance().setTitleTextAttributes(barButtonFontAttrs, for: .normal)
        UIBarButtonItem.appearance().setTitleTextAttributes(barButtonFontAttrs, for: .highlighted)
    }

iOS 13.+采用UINavigationBarAppearance方法定制导航栏标题和导航栏按钮

检查此代码，可能会对您有所帮助

    let titleFontAttrs = [ NSAttributedString.Key.font: UIFont(name: "custom-font-name", size: 20)!, NSAttributedString.Key.foregroundColor: UIColor.white ]
    let barButtonFontAttrs = [ NSAttributedString.Key.font: UIFont(name: "custom-font-name", size: 14)! ]

    UINavigationBar.appearance().tintColor = UIColor.white // bar icons

    if #available(iOS 13.0, *) {
        let appearance = UINavigationBarAppearance()
        appearance.backgroundColor = .red // If you want different nav background color other than white

        appearance.titleTextAttributes = titleFontAttrs
        appearance.largeTitleTextAttributes = titleFontAttrs // If your app supports largeNavBarTitle

        UINavigationBar.appearance().isTranslucent = false

        appearance.buttonAppearance.normal.titleTextAttributes = barButtonFontAttrs
        appearance.buttonAppearance.highlighted.titleTextAttributes = barButtonFontAttrs

        UINavigationBar.appearance().standardAppearance = appearance
        UINavigationBar.appearance().compactAppearance = appearance
        UINavigationBar.appearance().scrollEdgeAppearance = appearance
    } else {
        UINavigationBar.appearance().barTintColor = .red // bar background

        UINavigationBar.appearance().titleTextAttributes = titleFontAttrs

        UINavigationBar.appearance().isTranslucent = false

        UIBarButtonItem.appearance().setTitleTextAttributes(barButtonFontAttrs, for: .normal)
        UIBarButtonItem.appearance().setTitleTextAttributes(barButtonFontAttrs, for: .highlighted)
    }

---

谢谢，它工作得很好。顺便问一下，你知道为什么另一种方法突然不起作用吗？这真的很奇怪。这是苹果的一个缺陷。确保在mac上添加feedback reporter，以便将来的xcode版本能够正确编译此文件，因为它工作得非常完美。顺便问一下，你知道为什么另一种方法突然不起作用吗？这真的很奇怪。这是苹果的一个缺陷。确保在mac上添加反馈报告器，以便将来的xcode版本能够正确编译此代码。我使用的是iOS 14和xcode 12，上面的代码根本没有生效。这很奇怪，我已经在UINavigationController中定义了上述内容extension@NoorxCode12和iOS面临同样的问题14@pawan_kumar导航栏背景没有为您更改，或者栏按钮属性没有更改？还是两者都有？@Noor我只检查了导航标题。我用的是UILabel。奇怪的是，我用的是iOS 14和Xcode 12，上面的代码根本就不起作用。奇怪的是，我在UINavigationController中定义了上面的代码extension@NoorxCode12和iOS面临同样的问题14@pawan_kumar导航栏背景没有为您更改，或者栏按钮属性没有更改？还是两者都有？@Noor我只检查了导航标题。我使用了UILabel。