Register UIViewController to listen to keyboard notifications

UIViewController+KeyboardNotifications.h

//
//  UIViewController+KeyboardNotifications.h
//  
//
//  Created by Arnaud Coomans on 15/02/13.
//  Copyright (c) 2013 Arnaud Coomans. All rights reserved.
//

#import <UIKit/UIKit.h>

/* With this category, you can use:
 #pragma mark - keyboard notifications
 - (void)keyboardWillShowNotification:(NSNotification*)notification {}
 - (void)keyboardDidShowNotification:(NSNotification*)notification {}
 - (void)keyboardWillHideNotification:(NSNotification*)notification {}
 - (void)keyboardDidHideNotification:(NSNotification*)notification {}
 */

@interface UIViewController (KeyboardNotifications)
- (void)registerForKeyboardNotifications;
- (void)unregisterForKeyboardNotifications;
@end

UIViewController+KeyboardNotifications.m

//
//  UIViewController+KeyboardNotifications.m
//  
//
//  Created by Arnaud Coomans on 15/02/13.
//  Copyright (c) 2013 Arnaud Coomans. All rights reserved.
//

#import "UIViewController+KeyboardNotifications.h"

@implementation UIViewController (KeyboardNotifications)

- (void)registerForKeyboardNotifications {
	
	if ([self respondsToSelector:@selector(keyboardWillShowNotification:)]) {
		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShowNotification:) name:UIKeyboardWillShowNotification object:nil];
		
	}
	
	if ([self respondsToSelector:@selector(keyboardDidShowNotification:)]) {
		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShowNotification:) name:UIKeyboardDidShowNotification object:nil];

	}
	
	if ([self respondsToSelector:@selector(keyboardWillHideNotification:)]) {
		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHideNotification:) name:UIKeyboardWillHideNotification object:nil];
		
	}
	
	if ([self respondsToSelector:@selector(keyboardDidHideNotification:)]) {
		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHideNotification:) name:UIKeyboardDidHideNotification object:nil];

	}
}

- (void)unregisterForKeyboardNotifications {
	[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
	[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidShowNotification object:nil];
	[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
	[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidHideNotification object:nil];
}


@end