ios 13上的导航栏标题字体问题

Question

我使用的是 Xcode 11.4 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它可以正常工作，但是在 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值字体，一秒钟后它会变回自定义字体。

下面是问题的gif：

导航栏字体问题

Answer 1

给你，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

Answer 2

iOS 13.+ 有UINavigationBarAppearance方法来自定义 NavigationBar-Title 和 NavigationBar-BarButtonItems

检查此代码，可能对您有所帮助

    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)
    }