An example in Objective-C of animating the UI based on keyboard appearance/disappearance

KeyboardAnimation.m

///
/// Category to help with animating UIView instances
///
@implementation UIView (Animation)

-(void)translateX:(float)x andY:(float)y
{
    CGPoint center = self.center;
    center.x += x;
    center.y += y;
    self.center = center;
}

-(void)completeTranslateX:(float)x andY:(float)y
{
    self.transform = CGAffineTransformMakeTranslation(2*x, 2*y);
}

-(void)resetTransform
{
    self.transform = CGAffineTransformIdentity;
}

@end

///
/// Example UIViewController subclass implementation
///
@implementation ExampleViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    // Register for keyboard show events
    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc addObserver:self
           selector:@selector(keyboardWillShow:)
               name:UIKeyboardWillShowNotification
             object:nil];
    [nc addObserver:self
           selector:@selector(keyboardWillHide:)
               name:UIKeyboardWillHideNotification
             object:nil];
}

#pragma mark - Keyboard show/hide animation Implementation

- (void)keyboardWillShow:(NSNotification *)notification
{
    // Use notification parameter for duration to support localized keyboards (EG, Japanese)
    NSDictionary *info = [notification userInfo];
    NSNumber *number = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    double duration = [number doubleValue];
    
    int distance = -10;
    
    [UIView animateWithDuration:duration
                          delay:0.0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
                         
                         [_exampleView translateX:0 andY:distance];
                     }
                     completion:^(BOOL finished){

                         [_exampleView completeTranslateX:0 andY:distance];
                     }];
}

-(void)keyboardWillHide:(NSNotification *)notification
{
    NSDictionary *info = [notification userInfo];
    NSNumber *number = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    double duration = [number doubleValue];
    
    int distance = 10;
    
    [UIView animateWithDuration:duration
                          delay:0.0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
                         
                         // Top
                         [_exampleView translateX:0 andY:distance];
                     }
                     completion:^(BOOL finished){
                        
                         // Reset their positions to prevent weird bug with UIAlerts
                         [_exampleView resetTransform];
                     }];
}

@end