- (void)handleKeyboardWillShowNotification:(NSNotification *)notification {
    NSTimeInterval animationDuration = 0;
    CGRect keyboardFrame = CGRectZero;
    NSDictionary *userInfo = [notification userInfo];
    [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration];
    [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardFrame];
    
    printf("keyboardFrame height: %f\n", keyboardFrame.size.height);

    [self showWithAnimationDuration:animationDuration keyboardFrame:keyboardFrame];
}

keyboardFrame height: 125.000000
keyboardFrame height: 302.000000

keyboardFrame height: 248.000000

- (CGFloat)keyboardHeight {
   UIWindow *keyboardWindow = [[[UIApplication sharedApplication] windows] lastObject];
   UIView *inputView = [keyboardWindow.rootViewController.view tkp_findSubview:@"UIInputSetHostView"];
   if (inputView) {
       return inputView.tkp_height;
   }
   return 0;
}

- (UIView *)tkp_findSubview:(NSString *)name {
    return [self tkp_findSubview:name resursion:NO];
}

- (UIView *)tkp_findSubview:(NSString *)name resursion:(BOOL)resursion {
    Class class = NSClassFromString(name);
    for (UIView *subview in self.subviews) {
        if ([subview isKindOfClass:class]) {
            return subview;
        }
    }

    if (resursion) {
        for (UIView *subview in self.subviews) {
            UIView *tempView = [subview tkp_findSubview:name resursion:resursion];
            if (tempView) {
                return tempView;
            }
        }
    }

    return nil;
}