What is the animation speed of the keyboard appearing in iOS8?

You can get the animation duration and the animation curve from the userInfo dictionary on the keyboardWillShow: notifications.

First register for the notification

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

Then get the values from the notifications userInfo keys.

- (void)keyboardWillShow:(NSNotification*)notification {
    NSNumber *duration = [notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSNumber *curve = [notification.userInfo objectForKey: UIKeyboardAnimationCurveUserInfoKey];

   // Do stuff with these values.
}

There are a lot more of these keys, and you can also get them from the UIKeyboardWillDismiss notification.

This functionality is available all the way back to iOS 3.0 😀

Heres the docs:

https://developer.apple.com/documentation/uikit/uiresponder/1621576-keyboardwillshownotification

Swift Version

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)

@objc func keyboardWillShow(_ notification: Notification) {
    let duration = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey]
    let curve = notification.userInfo?[UIResponder.keyboardAnimationCurveUserInfoKey]
}

Updated for latest swift version

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)

private func keyboardWillShow(_ notification: Notification) {
    let animationDuration = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as? Double
    let animationCurve = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber
    guard let duration = animationDuration, let curve = animationCurve else {
        // values weren't available
        return
    }
    let curveAnimationOption = UIView.AnimationOptions(rawValue: curve.uintValue)
    UIView.animate(withDuration: duration, delay: 0.0, options: curveAnimationOption, animations: {
        // do animations
        print("ANIMATING---")
    }, completion: { completed in
        // completion block
        print("COMPLETING---")
    }) 
}