Disabling keys on keyboard

Question

I am new to Objective-C, and I am looking to limit a user from switching from the alphabet portion of a normal keyboard to the numeric/punctuation side. This being said, I would

Answer 1

I implemented a neater solution. The trick is to place a disabled key image on top of the keyboard.

To do this

1. Run emulator (in 100% scale) and screen grab the asset you'd like (in my case, this was a disabled Done button at the bottom right end)
2. Place this image on top of the keyboard

Note that keyboard is placed in a separate UIWindow (since iOS5 I believe) and thus, you will need to do the following

+ (void) addSubviewToTop:(UIView *)view {
     int count = [[[UIApplication sharedApplication] windows] count];
     if(count <= 0)  {
        warn(@"addSubviewToTop failed to access application windows");
     }
     UIWindow *top_window = [[[UIApplication sharedApplication] windows] objectAtIndex:count-1];
     [top_window addSubview:view];
     [top_window bringSubviewToFront:view];
}