iOS 如何重新启动应用程序以更改语言 Swift 4

Question

我使用多语言应用程序，我想在配置文件用户中手动更改语言。

我已经有了 Localization.string

如果我更改设备语言，应用程序中的语言会更改为。

但我想从用户配置文件示例手动更改语言:

为此我使用下一个代码:

private func changeToLanguage(_ langCode: String) {
    if Bundle.main.preferredLocalizations.first != langCode {
        let message = "In order to change the language, the App must be closed and reopened by you."
        let confirmAlertCtrl = UIAlertController(title: "App restart required", message: message, preferredStyle: .alert)

        let confirmAction = UIAlertAction(title: "Close now", style: .destructive) { _ in
            UserDefaults.standard.set([langCode], forKey: "AppleLanguages")
            UserDefaults.standard.synchronize()
            exit(EXIT_SUCCESS)
        }
        confirmAlertCtrl.addAction(confirmAction)

        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        confirmAlertCtrl.addAction(cancelAction)

        present(confirmAlertCtrl, animated: true, completion: nil)
    }
    UserDefaults.standard.set([langCode], forKey: "AppleLanguages")
    UserDefaults.standard.synchronize()
}



  @IBAction func didPressChangeLanguageButton() {
    let message = "Change language of this app including its content."
    let sheetCtrl = UIAlertController(title: "Choose language", message: message, preferredStyle: .actionSheet)

    for languageCode in Bundle.main.localizations.filter({ $0 != "Base" }) {
        let langName = Locale.current.localizedString(forLanguageCode: languageCode)
        let action = UIAlertAction(title: langName, style: .default) { _ in
            self.changeToLanguage(languageCode) // see step #2
        }
        sheetCtrl.addAction(action)
    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
    sheetCtrl.addAction(cancelAction)

    sheetCtrl.popoverPresentationController?.sourceView = self.view
    sheetCtrl.popoverPresentationController?.sourceRect = self.changeLanguageButton.frame
    present(sheetCtrl, animated: true, completion: nil)
}

我使用这个包:

Bundle.main.localizations.filter({ $0 != "Base" })
Locale.current.localizedString(forLanguageCode: "en")

对于这段代码，我有:

当我按下按钮时出现错误:

reason: 'Actions added to UIAlertController must have a title'

我不知道问题出在哪里。

Answer 1

在我最近的应用程序中，我使用了这个 localize ，它很简单，无需关闭应用程序，我们就可以根据语言切换应用程序。

将localize.swift文件添加到你的项目中，最后在你需要的地方调用下面的func

if let pre = Bundle.main.preferredLocalizations.first, !pre.isEmpty  {
            if pre == Language.english.rawValue{
                Language.language = Language.arabic
            }else{
                 Language.language = Language.english
            }

        }