swiftgen + Localize_Swift 实现app内切换语言

最近在给自己的app 做国际化，做个总结 顺便回答了个stackoverflow 的问题：
https://stackoverflow.com/questions/45731079/changing-language-at-runtime-using-swiftgen

Now you can config lookupFunction params in swiftgen.yml file

strings:
inputs:
- en.lproj
outputs:
- templateName: structured-swift5
params:
lookupFunction: Localize_Swift_bridge(forKey:table:fallbackValue:)
output: L10n-Constants.swift

in your app you just need implement lookupFunction,
your can use use Localize_Swift library

import Localize_Swift;
func Localize_Swift_bridge(forKey:String,table:String,fallbackValue:String)->String {
return forKey.localized(using: table);
}

generated code may like this:

internal enum Localizable {
internal static var baseConfig: String { return
L10n.tr("Localizable", "base config", fallback: #"Base Config"#) }}

extension L10n {
private static func tr(_ table: String, _ key: String, _ args: CVarArg..., fallback value: String) -> String {
let format = Localize_Swift_bridge(forKey:table:fallbackValue:)(key, table, value)
return String(format: format, locale: Locale.current, arguments: args)
}
}

https://github.com/SwiftGen/SwiftGen/blob/stable/Documentation/templates/strings/structured-swift5.md

https://github.com/marmelroy/Localize-Swift