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2013-03-07T01:02:53.080
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<p>Object oriented programming is a beautiful thing. Coded this real fast to show you how it works...</p> <pre><code>// // PlayingCard.h // #import <Foundation/Foundation.h> @interface PlayingCard : NSObject - (id)initWithSuit:(NSInteger)suit value:(NSInteger)value; - (BOOL)isAce; - (BOOL)isFace; @end // // PlayingCard.m // #import "PlayingCard.h" @interface PlayingCard () @property(nonatomic, assign) NSInteger suit; @property(nonatomic, assign) NSInteger value; @end @implementation PlayingCard - (id)initWithSuit:(NSInteger)suit value:(NSInteger)value { self = [self init]; if (self) { _suit = suit; _value = value; } return self; } - (BOOL)isAce { return self.value == 0; } - (BOOL)isFace { return self.value > 10; } - (NSString *)suitName { switch (self.suit) { case 0: return @"spades"; break; case 1: return @"diamonds"; break; case 2: return @"clubs"; break; case 3: return @"hearts"; break; default: return @""; break; } } // so it prints nicely. you should consider making the suits enums - (NSString *)description { return [NSString stringWithFormat:@"%@: suit:%@, value:%d", [super description], [self suitName], self.value]; } @end // // CardDeck.h // #import <Foundation/Foundation.h> @class PlayingCard; @interface CardDeck : NSObject + (id)cardDeck; - (void)shuffle; - (NSUInteger)count; - (PlayingCard *)dealOne; @end // // CardDeck.m // #import "CardDeck.h" #import "PlayingCard.h" @interface CardDeck () @property(nonatomic,strong) NSMutableArray *cards; @end @implementation CardDeck + (id)cardDeck { CardDeck *deck = [[self alloc] init]; for (NSInteger suit = 0; suit < 4; suit++) { for (NSInteger value = 0; value < 13; value++) { PlayingCard *card = [[PlayingCard alloc] initWithSuit:suit value:value]; [deck.cards addObject:card]; } } return deck; } - (id)init { self = [super init]; if (self) { _cards = [NSMutableArray array]; } return self; } - (void)shuffle { NSMutableArray *shuffledCards = [NSMutableArray array]; for (int i=0; i<52; i++) { int randomIndex = arc4random_uniform(52-i); [shuffledCards addObject:[self.cards objectAtIndex:randomIndex]]; [self.cards removeObjectAtIndex:randomIndex]; } self.cards = shuffledCards; } - (NSUInteger)count { return self.cards.count; } - (PlayingCard *)dealOne { PlayingCard *card = [self.cards lastObject]; [self.cards removeLastObject]; return card; } @end </code></pre> <p>Call it like this ...</p> <pre><code>CardDeck *deck = [CardDeck cardDeck]; // try it with and without shuffle [deck shuffle]; while (deck.count) { PlayingCard *card = [deck dealOne]; NSLog(@"%@", card); } </code></pre>
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