ASCII Art + Konami Code Easter Egg for iOS

ARKonamiKeyboardView.h

//
//  ARKonamiKeyboardView.h
//  Artsy
//
//  Created by Daniel Doubrovkine on 3/21/14.
//  Copyright (c) 2014 Art.sy. All rights reserved.
//

#import <DRKonamiCode/DRKonamiGestureRecognizer.h>

@interface ARKonamiKeyboardView : UIView <UIKeyInput>
- (id)initWithKonamiGestureRecognizer:(DRKonamiGestureRecognizer *)gestureRecognizer;
@end

ARKonamiKeyboardView.m

//
//  ARKonamiKeyboardView.m
//  Artsy
//
//  Created by Daniel Doubrovkine on 3/21/14.
//  Copyright (c) 2014 Art.sy. All rights reserved.
//

#import "ARKonamiKeyboardView.h"
#import <DRKonamiCode/DRKonamiGestureRecognizer.h>

@interface ARKonamiKeyboardView ()
@property (nonatomic, strong) DRKonamiGestureRecognizer *gestureRecognizer;
@end

@implementation ARKonamiKeyboardView

- (id)initWithKonamiGestureRecognizer:(DRKonamiGestureRecognizer *)gestureRecognizer
{
    self = [super init];
    if (self) {
        _gestureRecognizer = gestureRecognizer;
    }
    return self;
}

- (void)insertText:(NSString *)text {
    if ([text.lowercaseString isEqualToString:@"b"]) {
        [self.gestureRecognizer BButtonAction];
    } else if ([text.lowercaseString isEqualToString:@"a"]) {
        [self.gestureRecognizer AButtonAction];
        [self.gestureRecognizer enterButtonAction];
    } else {
        [self.gestureRecognizer enterButtonAction];
    }
}

- (BOOL)canBecomeFirstResponder {
    return YES;
}

- (void)deleteBackward {

}

- (BOOL)hasText {
    return YES;
}

@end

SampleViewController.m

#import <DRKonamiCode/DRKonamiGestureRecognizer.h>
#import "ARKonamiKeyboardView.h"
#import <ARASCIISwizzle/UIFont+ASCII.h>
#import <ARASCIISwizzle/UIImageView+ASCII.h>

@interface SampleViewController() <DRKonamiGestureProtocol>
@property (nonatomic, readonly) ARKonamiKeyboardView *konamiKeyboardView;
@end

(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self addKonami];
}

- (void)konami:(DRKonamiGestureRecognizer *)recognizer
{
  if ([recognizer konamiState] == DRKonamiGestureStateRecognized ) {
    UIFont.ascii = ! UIFont.ascii;
    UIImageView.ascii = ! UIImageView.ascii;
    // TODO: reload current view
  }
}

- (void)addKonami
{
  DRKonamiGestureRecognizer *konamiGestureRecognizer = [[DRKonamiGestureRecognizer alloc] initWithTarget:self action:@selector(konami:)];
  _konamiKeyboardView = [[ARKonamiKeyboardView alloc] initWithKonamiGestureRecognizer:konamiGestureRecognizer];
  [konamiGestureRecognizer setKonamiDelegate:self];
  [konamiGestureRecognizer setRequiresABEnterToUnlock:YES];
  [self.view addGestureRecognizer:konamiGestureRecognizer];
}

#pragma mark -
#pragma mark DRKonamiGestureProtocol

- (void)DRKonamiGestureRecognizerNeedsABEnterSequence:(DRKonamiGestureRecognizer*)gesture
{
  [self.view addSubview:self.konamiKeyboardView];
  [self.konamiKeyboardView becomeFirstResponder];
}

- (void)DRKonamiGestureRecognizer:(DRKonamiGestureRecognizer*)gesture didFinishNeedingABEnterSequenceWithError:(BOOL)error
{
  [self.konamiKeyboardView resignFirstResponder];
  [self.konamiKeyboardView removeFromSuperview];
}