iOS本地化，模拟器和设备始终使用Base.lproj而不是用户首选的语言环境

我正在创建一个应用程序，目前我想以英语和德语提供.我检查了项目配置中的基本本地化标记，并添加了German.我离开了英语作为开发语言.

I am creating an app that for now I would like to offer in English and German. I checked the Base localization mark in the project configuration and added German. I left English as the development language.

然后我创建了一个文件Translation.plist，该文件基本上由我称为类别的字典组成，例如我有一本用于按钮文本，标签文本等的字典.每个类别字典又由包含两个字符串的字典组成:值和注释. Translation.plist通过XCode进行了本地化.文件夹Base.lproj，en.lproj和de.lproj存在，并且包含预期的plist文件的副本.

Then I created a file Translation.plist which basically consists of dictionaries that I call categories, e.g. I have one dictionary for button texts, label texts etc. Each of the category dictionaries again consists of dictionaries that contain two Strings: value and comment. Translation.plist is localized via XCode. The folders Base.lproj, en.lproj and de.lproj exist and contain a copy of the plist-file as expected.

然后，我创建了一个类Translator.swift，该类应该根据用户的首选语言环境将Translation.plist文件作为NSDictionary加载.代码如下:

Then I created a class Translator.swift that is supposed to load the Translation.plist file as an NSDictionary depending on the user's preferred locale. The code looks like this:

func relevantDictionary(category: String) -> NSDictionary {
    let preferredLocale = Bundle.main.preferredLocalizations.first ?? "Base"
    NSLog("User's preferred locale is \(preferredLocale)")
    guard let url = Bundle.main.url(forResource: "Translation", withExtension: "plist") else {
        fatalError("Could not find Translation.plist")
    }

    NSLog("Using \(url.absoluteURL) for translation")
    guard let root = NSDictionary(contentsOf: url) else {
        fatalError("Could not find dictionary for category (locale=\(preferredLocale)")
    }

    guard let relevant = root.value(forKey: category) as? NSDictionary else {
        fatalError("Could not create dictionary from Translation.plist")
    }

    return relevant
}

然后，我创建了一个使用扩展程序的String扩展，如下所示:

Then I created a String extension that uses the Translator as follows:

func localize(category: String) -> String {
    return Translator.instance.translate(category: category, string: self)
}

通过此操作，我通过"yes" .localize("button")来调用翻译器.在英语中，我期望是"，在德语中，我期望"Ja".日志显示以下内容:

With this I call the Translator by "yes".localize("button"). In English I would expect "Yes", in German I would expect "Ja". The log says the following:

2017-07-05 08:45:24.728 myApp [13598:35048360]用户的首选语言环境是de_DE

2017-07-05 08:45:24.728 myApp[13598:35048360] User's preferred locale is de_DE

2017-07-05 08:45:24.728 myApp [13598:35048360]使用file:///Users/me/Library/Developer/CoreSimulator/Devices/A39D3318-943D-4EFE-BB97-5C2218279132/data/Containers /Bundle/Application/4614E696-B52E-4C30-BBE8-3C76F6392413/myApp.app/Base.lproj/Translation.plist进行翻译

2017-07-05 08:45:24.728 myApp[13598:35048360] Using file:///Users/me/Library/Developer/CoreSimulator/Devices/A39D3318-943D-4EFE-BB97-5C2218279132/data/Containers/Bundle/Application/4614E696-B52E-4C30-BBE8-3C76F6392413/myApp.app/Base.lproj/Translation.plist for translation

我想知道为什么会这样以及我错过了什么.我本来希望加载de.lproj/Translation.plist而不是Base.lproj/Translation.plist.

I wonder why this happens and what I have missed. I would have expected that de.lproj/Translation.plist is loaded instead of Base.lproj/Translation.plist.

我们非常感谢您的帮助.

Any help is highly appreciated.