What is the iPhone's default keyboard animation rate? - iphone

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....any insight?

Answer 1

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

Answer 2

UIKeyboardAnimationDurationUserInfoKey now is a NSNumber object, that makes the code shorter.
- (void)keyboardWillShowNotification:(NSNotification *)notification
{
NSDictionary *info = [notification userInfo];
NSNumber *number = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
double duration = [number doubleValue];
}

Answer 3

Since this is the first google hit, I'd like to point out that hard-coding 0.3 will mean that your view will incorrectly animate when international users (e.g. Japanese) swap between different-sized keyboards (when that action ought to be instant).
Always use the notification's userInfo dictionary's UIKeyboardAnimationDurationUserInfoKey value - it gets set to 0 when the user is flicking through keyboards.

Answer 4

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;
}

Answer 5

UIKeyboardAnimationDurationUserInfoKey
The key for an NSValue object containing a double that identifies the duration of the animation in seconds.

Answer 6

In Swift your code will look like this:
let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size
let animationDuration = ((userInfo[UIKeyboardAnimationDurationUserInfoKey]) as! NSNumber).floatValue
let animationOptions = ((userInfo[UIKeyboardAnimationCurveUserInfoKey]) as! NSNumber).unsignedLongValue
UIView.animateWithDuration(NSTimeInterval(animationDuration), delay: 0,
options: UIViewAnimationOptions(rawValue: animationOptions),
animations: { () -> Void in
self.view.frame.origin.y += keyboardSize.height
},
completion: nil)

Answer 7

Swift 4 - worked for me:
if let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? Double {
UIView.animate(withDuration: duration, animations: {
self.view.layoutIfNeeded()
})
}
In debug mode my duration was 3.499999