Lock keyboard layout iOs

hi everyone. i have one problem in my ios game. i write login screen and use

	private TouchScreenKeyboard _keyboard;

	_keyboard = TouchScreenKeyboard.Open(_username, TouchScreenKeyboardType.Default, false, false, false, false, _username);

to control my keyboard, and

_username = GUI.TextField(new Rect(Screen.height/2 - Screen.height / 4 + 20, Screen.width / 2 - Screen.width / 4 + 20, 
				Screen.height/2 + Screen.height / 4 - 40, 30), _username);

to my input. but in ipad, when keyboard shows i can switch my keyboard layout to russian, korean, italian and other languages. can i somehow lock keyboard layout to english only? thanks to all

I might be wrong, but I believe this is something only the ipad user can do in its settings. There might be a way of doing it with xcode but that would require a plugin.