ios - 本地化 Swizzling 使用选择器更改语言 swift4

Question

我正在尝试更改应用程序语言并使用 Swizzling 函数，但在调用 DoTheSwizzling() 时出现问题，选择器崩溃了!我认为找不到“specialLocalizedStringForKey”所以它给了我 nil，我不知道出了什么问题？

 class Languages {

        class func DoTheSwizzling() {

            MethodSwizzleGivenClassName(cls: Bundle.self, originalSelector: #selector(Bundle.localizedString(forKey:value:table:)), overrideSelector: Selector(("specialLocalizedStringForKey:value:table:")))
        }
    }

    extension Bundle {
        func specialLocalizedStringForKey(key: String, value: String?, table tableName: String?) -> String {
            let currentLanguage = Languages.currentAppleLanguage()
            var bundle = Bundle();
            if let _path = Bundle.main.path(forResource: currentLanguage, ofType: "lproj") {
                bundle = Bundle(path: _path)!
            } else {
                let _path = Bundle.main.path(forResource: "Base", ofType: "lproj")!
                bundle = Bundle(path: _path)!
            }
            return (bundle.specialLocalizedStringForKey(key: key, value: value, table: tableName))
        }
    }


    func MethodSwizzleGivenClassName(cls: AnyClass, originalSelector: Selector, overrideSelector: Selector) {

        let origMethod: Method = class_getInstanceMethod(cls, originalSelector)!;
        let overrideMethod: Method = class_getInstanceMethod(cls, overrideSelector)!;

        if (class_addMethod(cls, originalSelector, method_getImplementation(overrideMethod), method_getTypeEncoding(overrideMethod))) {
            class_replaceMethod(cls, overrideSelector, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
        } else {
            method_exchangeImplementations(origMethod, overrideMethod);
        }
    }

Answer 1

Localizable.strings(英文)

"Home" = "Home";

Localizable.strings(阿拉伯语)

"Home" = "Home Arabic";

EX:LanguageFile 的 NSObject 类名

 var home = "Home".localized(lang:"Your language")//en , ar

你的字符串扩展

extension String {
  func localized(lang:String) ->String {
    //print(lang)
    let path = Bundle.main.path(forResource: lang, ofType: "lproj")
    let bundle = Bundle(path: path!)

    return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "")
  }
}

在你的 View Controller 中

print(LanguageFile().home)

您可以根据您的应用语言获取字符串。

你可以试试这个例子 https://github.com/karthickkck315/Language