ios 13上的导航栏标题字体问题

Question

我使用的是Xcode11.4和iOS 13.4。我已经使用UINavigatinBar.appearance()设置了导航栏标题自定义字体，并且工作正常，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，并在一秒钟后更改回自定义字体。

下面是问题的gif：

nav bar font problem

Answer 1

iOS 13.+使用UINavigationBarAppearance方法来自定义导航栏-标题和导航栏-栏按钮项

检查这段代码，可能会对你有所帮助

    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)
    }

Answer 2

在这里，您可以在viewDidAppear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