Change between dark and light keyboard iOS7

Question

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?

Answer 1

textfield.keyboardAppearance = UIKeyboardAppearanceDark;

Answer 2

在Swift 3中：

textfield.keyboardAppearance = UIKeyboardAppearance.dark

Answer 3

For anyone else that finds this question from google, you can also make the keyboard dark from the storyboard as well.