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 (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...