What is the iPhone's default keyboard animation rate?

Question

A while ago I remember seeing a constant of some kind that defined the animation rate of the Keyboard on the iPhone and I can not for the life of me remember where I saw it.

Answer 1

To add a bit more to what Shaggy Frog wrote. The full implementation would be something like:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardMovement:)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardMovement:)
                                             name:UIKeyboardWillHideNotification
                                           object:nil];


-(void)keyboardMovement:(NSNotification *)notification{
    if (_numericKeyboardShowing == false){
        [UIView animateWithDuration:[self keyboardAnimationDurationForNotification:notification] delay:0
                        options:UIViewAnimationCurveEaseInOut
                     animations:^ {
                         self.bottomContainerView.center = CGPointMake(self.bottomContainerView.center.x, (self.bottomContainerView.center.y - 218));
                                  }
                     completion:NULL];

    _numericKeyboardShowing = true;
   }
   else{
    [UIView animateWithDuration:[self keyboardAnimationDurationForNotification:notification] delay:0
                        options:UIViewAnimationCurveLinear
                     animations:^ {
                         self.bottomContainerView.center = CGPointMake(self.bottomContainerView.center.x, (self.bottomContainerView.center.y + 218));
                     }
                     completion:NULL];

    _numericKeyboardShowing = false;
}

- (NSTimeInterval)keyboardAnimationDurationForNotification:(NSNotification *)notification
{
    NSDictionary *info      = [notification userInfo];
    NSValue* value          = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval duration = 0;
    [value getValue:&duration];
    return duration;
}