feat: add support for changing languages without restarting app (#276)

Sources/Mantis/Config.swift

@@ -59,13 +59,15 @@ public struct Config {
         guard let bundle = Bundle(identifier: bundleIdentifier) else {
             return nil
         }
-
-        if let url = bundle.url(forResource: "MantisResources", withExtension: "bundle") {
-            let bundle = Bundle(url: url)
-            return bundle
+
+        guard let url = bundle.url(forResource: "MantisResources", withExtension: "bundle") else {
+            return nil
         }
-        return nil
+
+        return Bundle(url: url)
     }()
+
+    static var language: Language?
 
     public init() {}
 

Sources/Mantis/Helpers/LocalizedHelper.swift

@@ -10,7 +10,7 @@ import Foundation
 
 struct LocalizedHelper {
     private static var bundle: Bundle?
-        
+
     static func setBundle(_ bundle: Bundle) {
         guard let resourceBundleURL = bundle.url(
             forResource: "MantisResources", withExtension: "bundle")
@@ -28,6 +28,10 @@ struct LocalizedHelper {
 #if MANTIS_SPM
         let bundle = localizationConfig.bundle ?? Bundle.module
 
+        guard let bundle = convertToLanguageBundleIfNeeded(by: bundle) else {
+            return value
+        }
+
         return NSLocalizedString(
             key,
             tableName: localizationConfig.tableName,
@@ -40,6 +44,10 @@ struct LocalizedHelper {
             return value
         }
 
+        guard let bundle = convertToLanguageBundleIfNeeded(by: bundle) else {
+            return value
+        }
+
         return NSLocalizedString(
             key,
             tableName: localizationConfig.tableName,
@@ -49,4 +57,14 @@ struct LocalizedHelper {
         )
 #endif
     }
+
+    static private func convertToLanguageBundleIfNeeded(by bundle: Bundle?) -> Bundle? {
+        if let languageCode = Mantis.Config.language?.code,
+           let languageBundlePath = bundle?.path(forResource: languageCode, ofType: "lproj"),
+           let languageBundle = Bundle(path: languageBundlePath) {
+            return languageBundle
+        }
+
+        return bundle
+    }
 }

Sources/Mantis/Mantis.swift

@@ -60,6 +60,22 @@ public func crop(image: UIImage, by cropInfo: CropInfo) -> UIImage? {
     return image.crop(by: cropInfo)
 }
 
+public struct Language {
+    var code: String
+
+    public init(code: String) {
+        self.code = code
+    }
+}
+
+public func chooseLanguage(_ language: Language) {
+    Mantis.Config.language = language
+}
+
+public func resetLanguage() {
+    Mantis.Config.language = nil
+}
+
 // MARK: - internal section
 var localizationConfig = LocalizationConfig()