ios - 如何更改 Xcode Playground 上的语言环境

Question

我想更改 Xcode Playground 上的语言环境以测试本地化。

我找到了这个解决方案，但它在 Xcode 6.3.2 Playground 上不起作用: http://natashatherobot.com/locale-playground-swift/

Answer 1

哦，我找到了解决办法!

extension NSLocale {
    class func mono_currentLocale() -> NSLocale {
        return NSLocale(localeIdentifier: "fr")
    }
}
let original = class_getClassMethod(NSLocale.self, #selector(getter: NSLocale.currentLocale))
let swizzled = class_getClassMethod(NSLocale.self, #selector(NSLocale.mono_currentLocale))
method_exchangeImplementations(original, swizzled)

编辑:Swift 4.1 版本:

extension NSLocale {
    @objc class func mono_currentLocale() -> NSLocale {
        return NSLocale(localeIdentifier: "fr")
    }
}
let original = class_getClassMethod(NSLocale.self, #selector(getter: NSLocale.current))!
let swizzled = class_getClassMethod(NSLocale.self, #selector(NSLocale.mono_currentLocale))!
method_exchangeImplementations(original, swizzled)