title: Change between dark and light keyboard iOS7
body: <p>In iOS7 we have both a dark and a light keyboard. Is it possible for me to change between these in my app by code?<img src="https://i.stack.imgur.com/8oT3h.png" alt="Dark keyboard"> <img src="https://i.stack.imgur.com/2fxcu.png" alt="Light keyboard"></p>