How to switch iPhone keyboard layout?

I have an app which has two different languages (English-German). You can switch within the app between the languages. 开发者_如何学编程My question now is, how to switch the keyboard as well? Not just the language but the keyboard layout. Both keyboard language layouts already available within the system, I just don't know how to switch between them.

Go through the following post, will helpful for you

Change Your Keyboard or Display Language in iOS

Setting the iPhone keyboard language