How to change UIAlertController button text colour in iOS9?

Question

The question is similar to iOS 8 UIActivityViewController and UIAlertController button text color uses window's tintColor but in iOS 9.

I have a UIAlertControlle

Answer 1

[[UIView appearance] setTintColor:[UIColor black]];  

this will change all the UIView tintColor as well as UIAlertController's view