Number pad Go Button, animation mimicking.

gistfile1.m

- (void)setupDecimalPadDone
{
    self.keyboardShownObserver = [[NSNotificationCenter defaultCenter] addObserverForName:UIKeyboardWillShowNotification
                                                                                    object:nil
                                                                                     queue:[NSOperationQueue mainQueue]
                                                                                usingBlock:^(NSNotification *note) {
                                                                                    
                                                                                    self.goButton = [UIButton buttonWithType:UIButtonTypeCustom];
                                                                                    [[[[UIApplication sharedApplication] windows] lastObject] addSubview:self.goButton];
                                                                                    
                                                                                    CGRect keyboardBeginFrame;
                                                                                    [[note.userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] getValue:&keyboardBeginFrame];
                                                                                    self.goButton.frame = CGRectMake(keyboardBeginFrame.origin.x,
                                                                                                                     (keyboardBeginFrame.origin.y + keyboardBeginFrame.size.height) - 53, 106, 53);
                                                                                    
                                                                                    self.goButton.adjustsImageWhenHighlighted = NO;
                                                                                    
                                                                                    [self.goButton setImage:[UIImage imageNamed:@"doneup.png"] forState:UIControlStateNormal];
                                                                                    [self.goButton setImage:[UIImage imageNamed:@"donedown.png"] forState:UIControlStateHighlighted];
                                                                                    
                                                                                    [self.goButton addTarget:self action:@selector(fetchLocationResults) forControlEvents:UIControlEventTouchUpInside];
                                                                                    
                                                                                    
                                                                                    
                                                                                    CGPoint newCenter = CGPointMake(self.goButton.superview.frame.origin.x + self.goButton.frame.size.width/2,
                                                                                                                    self.goButton.superview.frame.size.height - self.goButton.frame.size.height/2);
                                                                                    
                                                                                    [UIView animateWithDuration:[[note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue]
                                                                                                          delay:0
                                                                                                        options:[[note.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]
                                                                                                     animations:^{self.goButton.center = newCenter;} completion:nil];
                                                                                }];
    
    self.keyboardHiddenObserver = [[NSNotificationCenter defaultCenter] addObserverForName:UIKeyboardWillHideNotification
                                                                                    object:nil
                                                                                     queue:[NSOperationQueue mainQueue]
                                                                                usingBlock:^(NSNotification *note) {
                                                                                    
                                                                                    [UIView animateWithDuration:[[note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue]
                                                                                                          delay:0
                                                                                                        options:[[note.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]
                                                                                                     animations:^{
                                                                                                         CGRect keyboardEndFrame;
                                                                                                         [[note.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardEndFrame];
                                                                                                         self.goButton.frame = CGRectMake(keyboardEndFrame.origin.x + 106/2,
                                                                                                                                          (keyboardEndFrame.origin.y + keyboardEndFrame.size.height) - 53/2, 106, 53);
                                                                                                     } completion:^(BOOL finished) {
                                                                                                         if (finished){
                                                                                                             [self.goButton removeTarget:self
                                                                                                                                  action:@selector(fetchLocationResults)
                                                                                                                        forControlEvents:UIControlEventTouchUpInside];
                                                                                                             [self.goButton removeFromSuperview];
                                                                                                         }}];
                                                                                }];
}