Lecture 3: Card Match Game

lecture 3的slides和老师讲的实际稍有区别

实际上lecture 2结束的时候做了一个flip card的app，但是实际上我们之前写的四个类都没有用到，到了lecture 3，我也开始犯迷糊，有点晕了

其实还是因为基础的原因，没有写多个类的经验，没有做稍大项目的经验

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然后我又觉得这一切太复杂，需要梳理一下各个类之间的关系
用Python写了一个小的Parse Header的脚本（Github上找了一个稍微改了改，连正则表达式都难得查，真是半罐水和到处飘）
让我来理一理

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Card

objectivec通用类，继承自NSObject

+------------Class Name--------------+
            Card : NSObject

+------------Public Methods----------+

-(int)match :(NSArray *)otherCards;

+---------Public Properties----------+

@property (strong, nonatomic) NSString *contents;
@property (nonatomic, getter = isChosen) BOOL chosen;
@property (nonatomic, getter = isMatched) BOOL matched;

+------------------------------------+

Deck

objectivec通用类，import了Card，因为Deck由Card组成


+-------------Class Name--------------+

          Deck : NSObject

+------------Public Methods----------+

-(void)addCard:(Card *)card atTop:(BOOL)atTop;
-(void)addCard:(Card *)card;
-(Card *)drawRandomCard;

+---------Public Properties----------+

PlayingCard

objectivec继承自Card，重写了match方法，重写了contents getter

+-----------------------------------+
       PlayingCard : Card

+------------Public Methods----------+

+ (NSArray *)validSuits;
+ (NSArray *)rankStrings;
+ (NSUInteger)maxRank;

+---------Public Properties----------+

@property (strong, nonatomic) NSString *suit;
@property (nonatomic) NSUInteger rank;

PlayingCardDeck

objectivec继承自Deck，所以继承了一干方法
-(instancetype)init的特殊方法来init 要玩的纸牌

+-----------------------------------+
     PlayingCardDeck : Deck

+------------Public Methods----------+


+---------Public Properties----------+

这四个类，都是Model

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这一讲首先先解答了lecture 2的答案，制作也是精巧啊～～
看slides也会觉得很有意思，比如直接复制粘贴的按钮都会有drawRandomCard的效果...

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然而还是来看一下最终要制作游戏的步骤吧：

新建了一个Model，也就是这个model来控制游戏

objectivec
CardMatchingGame是来控制游戏的，import了Deck和Card
这是好事，因为import的是通用的类别

+-----------------------------------+

    CardMatchingGame : NSObject

+------------Public Methods----------+

-(instancetype)initWithCardCount :(NSUInteger)count
-(void)chooseCardAtIndex:(NSUInteger)index;
-(Card *)cardAtIndex:(NSUInteger)index;

+---------Public Properties----------+

@property (nonatomic,readonly)NSInteger score;

这个method -(instancetype)initWithCardCount :(NSUInteger)count来装载Card

实际上我觉得 -(void)chooseCardAtIndex:(NSUInteger)index 虽说不那么难理解，但是觉得写出来还蛮难的
注意readonly property仅仅是为了防止被外部修改score
内部可以重新将score定义为readwrite

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最终的最终，我们终于可以将这五个类统治/使用起来

objectivec
#import "CardGameViewController.h"
#import "PlayingCardDeck.h"
#import "Deck.h"
#import "CardMatchingGame.h"

@interface CardGameViewController ()
@property (strong, nonatomic) IBOutletCollection(UIButton) NSArray *cardButtons;
@property (weak, nonatomic) IBOutlet UILabel *scoreLabel;

@property (strong,nonatomic) CardMatchingGame *game;
@end

@implementation CardGameViewController

-(CardMatchingGame *)game{
    if (!_game) _game = [[CardMatchingGame alloc]initWithCardCount:[self.cardButtons count]
                                                         usingDeck:[self createDeck]];
    return _game;

}

-(Deck *)createDeck{
    return [[PlayingCardDeck alloc]init];
}



- (IBAction)touchCardButton:(UIButton *)sender
{
    int chosenButtonIndex = [self.cardButtons indexOfObject:sender];
    [self.game chooseCardAtIndex:chosenButtonIndex];
    [self updateUI];
}

- (void)updateUI{
    for (UIButton *cardButton in self.cardButtons) {
        int cardButtonIndex = [self.cardButtons indexOfObject:cardButton];
        Card *card = [self.game cardAtIndex:cardButtonIndex];
        [cardButton setTitle:[self titleForCard:card] forState:UIControlStateNormal];
        [cardButton setBackgroundImage:[self backgroundImageForCard:card] forState:UIControlStateNormal];
        cardButton.enabled = !card.isMatched;
        self.scoreLabel.text = [NSString stringWithFormat:@"Score : %d",self.game.score];
    }
}

-(NSString *)titleForCard:(Card *)card{
    return card.isChosen ? card.contents : @"";
}

-(UIImage *)backgroundImageForCard:(Card *)card{
    return [UIImage imageNamed:card.isChosen ? @"cardfront" : @"cardback"];
}
@end

代码写的非常非常漂亮，对我来说，觉得这是比较难以想象的。T_T

有很多精巧很有趣的地方，比如IBOutletCollection，写一个createDeck方法
UpdateUI放出来感觉这个可能可以想到

但是简洁的setTitle和background也是...
总之，太过精巧以至于很难结构....

望着这样的代码流口水.....