I had been doing something like this to mimic the keyboard animation on older version of iOS.
CGRect keyboardBeginFrame;
[[note.userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] getValue:&keyboardBeginFrame];
self.doneKeyboardButton.frame = CGRectMake(0, (keyboardBeginFrame.origin.y + keyboardBeginFrame.size.height) - 53, 106, 53);
[[[[UIApplication sharedApplication] windows] lastObject] addSubview:self.doneKeyboardButton];
CGPoint newCenter = CGPointMake(self.doneKeyboardButton.superview.frame.origin.x + self.doneKeyboardButton.frame.size.width/2,
self.doneKeyboardButton.superview.frame.size.height - self.doneKeyboardButton.frame.size.height/2);
[UIView animateWithDuration:[[note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue]-.02
delay:.0
options:[[note.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]
animations:^{
self.contentView.frame = CGRectOffset(self.contentView.frame, 0, -TextFieldViewMovement);
self.doneKeyboardButton.center = newCenter;
}
completion:nil];
However, this has stopped working on iOS7. It seems like the values returned are no longer exactly correct, and the Done button no longer exactly mimics the Keyboard display animation.
Best Answer
In iOS 7, the keyboard uses a new, undocumented animation curve. While some have noted that using an undocumented value for the animation option works, I prefer to use the following:
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 anUIViewAnimationOptions
. 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.