Like this, actually, it is will give me: viewDidLoad() instead of: override func viewDidLoad() { }

FUCK YOU Xcode. Code-completion always gives an error selection

From security considerations, you should not connect to the remote database directly in the application.  If you are only locally stored, you can consider using a cross-platform RealmSwift.

I found another solution. If you use Swift, you can set encoding with .isoLatin1 // codes let data = Data(base64Encoded: profileContent) let outputStr = String(data: data!, encoding: .isoLatin1) try outputStr?.write(to: saveUrl, atomically: true, encoding: .isoLatin1) it works fine in my application~