objective c - iOS 7 - Keyboard animation

Question

I'm trying to understand the new keyboard animation in iOS 7.0 on the iPhone 5 Simulator. I want to resize my UITableView when the keyboard appears, but I can't get the right animation details.
I'm using the information from the NSNotification object, when the keyboard appears or disappears.

Here is my log:

Move keyboard from {{0, 920}, {320, 216}} to {{0, 352}, {320, 216}}
 with duration: 0.400000
 and animation curve: 7

UIViewAnimationCurveEaseInOut = 0
UIViewAnimationCurveEaseIn = 1
UIViewAnimationCurveEaseOut = 2
UIViewAnimationCurveLinear = 3

The animation curve is an unknown value, what should I do?

Answer 1

In iOS 7, the keyboard uses a new, undocumented animation curve. While some have noted that using an undocumented value for the animation option, I prefer to use the following:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:[notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue]];
[UIView setAnimationBeginsFromCurrentState:YES];

// work

[UIView commitAnimations];

While block based animations are the recommendation, the animation curve returned from the keyboard notification is an UIViewAnimationCurve, while the option you would need to pass to block based animations is an UIViewAnimationOptions. Using the traditional UIView animation methods allows you to pipe the value directly in. Most importantly, this will use the new undocumented animation curve (integer value of 7) and cause the animation to match the keyboard. And, it will work just as well on iOS 6 and 7.