HTTPURLResponse.localizedString(forStatusCode:) not in development language

Question

I am making an iOS app, and I have this problem.

• My app most be only in Spanish, so i changed the development language (in the hard way, changing the developmentRegion = es; inside the the project.pbxproj and changing the CFBundleDevelopmentRegion=es in the Info.plist)
• I also add a Localizable.strings to my only language (es) to have all the Strings inside one document. And all my NSLocalizedStrings works fine

The problem comes out when i use the function HTTPURLResponse.localizedString(forStatusCode:) it only give me back Strings in English. Previously works fine, but after added the Localizable.string don't work well anymore

Any help to bring back the Strings to Spanish??

Answer 1

I think you are missing the correct approach.

You don't need to localise low level network error as:

• are generally useless to final user
• are handy to develop, not to be shown (you can eventually log them..)
• when you got a code, change it in a readable generic message, and THEN localise it.

For III point:

final private func downloadMyData(){

guard let myURL = URL(string: "__https://ingconti.com/wrongurl") else{

    return
}

let session = URLSession.shared

let task = session.dataTask(with: myURL) { (data: Data?, response: URLResponse?, error: Error?) in

    // session cannot be created...
       if let error = error  {
            self.manageLowLevel(error: error)
            return
        }

    var statusCode: Int = 0
    if let httpResponse : HTTPURLResponse = response as? HTTPURLResponse{
        statusCode = httpResponse.statusCode
    }

    if 200 ... 299 ~= statusCode {
        self.parse(data: data)
    }else{
        self.manageHTTPError(code: statusCode, data: data)
    }
}


task.resume()

}

If you got a BIG error (for example in my code I used a wrong prefix, "__https") You will get _code = -1022,

and You can manage this way:

 final private func manageLowLevel(error: Error){
        #if DEBUG
        print(error)
        #endif
        var msg = ""
        let code = error._code
        switch code {
        case -1002:
            msg = localized("GENERIC_NETWORK_ERR")
        default:
            msg = localized("GENERIC_NETWORK_ERR")
        }

        // display msg... (on MAIN THREAD...)
    }



    func localized(_ msg: String)->String{
        let s = NSLocalizedString(msg, comment : "")
        return s
    }

Where You can mask out message to final user and make it more general (and localised using a convenience function "localized")

For HTTP error (for example not found resource... i.e. "https://ingconti.com/wrongurl") You will get error 404 in http/s.

So you can do similar:

final private func manageHTTPError(code: Int, data : Data?){ guard let data = data else{ return }

    #if DEBUG
    if let s = String(data: data, encoding: .utf8){
        print(s)
    }else{
        if let s = String(data: data, encoding: .ascii){
            print(s)
        }
    }
    #endif

    var msg = ""
    switch code {
    case 404:
        msg = localized("NETWORK_CODE_404")
    default:
        msg = localized("GENERIC_NETWORK_ERR")
    }

    // display msg...
}

Or even merged toghether.

(string s in

#if DEBUG if let s = .....

will show server error, and again do not show to user...)

to sum up: so not show low level error, see gentle message, so for example in you localized strings You can have:

"GENERIC_NETWORK_ERR" = "Network error"; "NETWORK_CODE_404". = "Network error (no data)";

and in spanish...

"GENERIC_NETWORK_ERR" = "error de red "; ...

Hope it can help.