How to localize multiple Views in SwiftUI

Question

I'm new to SwiftUI, and my app also needs the feature translate language, so I have created a sample app first before incorporating this functionality to my other project. So as you can see in my code below, I can change the language by clicking the button, and it works flawlessly, but I have no idea how this would work with multiple views. I'm looking to localize all of them and want to remove redundancies.

import SwiftUI

struct ContentView: View {
    @State var title = ""

    var body: some View {
        VStack{
            Text(title)
                .padding()
            Button {
                title = "welcomeTitle".localizableString("en")
            } label: {
                Text("EN")
            }
            Button {
                title = "welcomeTitle".localizableString("ja")
            } label: {
                Text("JA")
            }
        }
        .onAppear {
//            title = "welcomeTitle".localizableString("en")
            if(Bundle.main.preferredLocalizations.first == "ja"){
                title = "welcomeTitle".localizableString("ja")
            }
            else{
                title = "welcomeTitle".localizableString("en")
            }
               }
              
    }
}

extension String {
    func localizableString(_ name: String) -> String {
        let path = Bundle.main.path(forResource: name, ofType: "lproj")
        let bundle = Bundle(path: path!)
        return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "")
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
           
           
    }
}

Answer 1

See before this

Then a convenient extension:

extension String {
    var localized: String {
        return NSLocalizedString(self, comment: "")
    }
}


//For your button
Button {
 //action
} label: {
Text("welcomeTitle".localized)
}

In your Localizable.strings file English, add the following: "welcomeTitle" = "welcomeTitle EN";

In your Localizable.strings file Japanese, add the following: "welcomeTitle" = "welcomeTitle JA";