Move up keyboard when editing UITextField on iOS9

Question

For my keyboards to move up to uncover UITextField in my iOS app, I used to implement this answer: https://stackoverflow.com/a/6908258/3855618 on iOS7 and 8 and it

Answer 1

i followed the doc from @Istvan to the apple site, and there are a lot of stuff missing to make it work:
1. Set your .h document to <UITextFieldDelegate> (to be able to work with "activefield")
2. In the viewDidLoad, set the delegates to your UITextfields, and set the height of your scrollview content with a bigger height (in my case i've setted 500 more):

CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height + 500;
_scrollView.contentSize = CGSizeMake(screenWidth, screenHeight);

And now it's all working...