Question

ios编程的新手，所以对于练习我试图制作一个带有扑克牌的简单应用程序，它可以回到视图上，你可以点击它来显示卡片的正面。每次点击它时，卡的正面都不同。我想要实现的是当我点击卡片时：

翻转并显示随机卡片，
有一个标签，每次翻转卡片时递增1

我完成了第二项要求，但我似乎无法让第一项要求正确。我有3个型号（卡，甲板，PlayCard）我的Deck模型负责随机化卡片，这里是代码。

加入deck.h

#import <Foundation/Foundation.h>
#import "Card.h"

@interface Deck : NSObject
- (void)addCard:(Card *)card atTop:(BOOL)atTop;

- (Card *)drawRandomCard;

@end

Deck.m

#import "Deck.h"
@interface Deck()

@property (strong, nonatomic) NSMutableArray *cards;

@end

@implementation Deck
-(NSMutableArray *)cards
{
    if(!_cards) _cards =[[NSMutableArray alloc] init];
    return _cards;
} 

- (void)addCard:(Card *)card atTop:(BOOL)atTop
{
    if(card){
        if(atTop){
            [self.cards insertObject:card atIndex:0];
        }
        else
        {
            [self.cards addObject:card];
        }
    }
} 

- (Card *)drawRandomCard
{
    Card *randomCard = nil;  

    if(self.cards.count){
        unsigned index = arc4random() % self.cards.count;
        randomCard = self.cards[index];
        [self.cards removeObjectAtIndex:index];
    }

    return randomCard;
}
@end

我的PlayCard基本上描述了卡的内容。例如。杰克的心，2个钻石杰克将成为卡片的“等级”和“心”将是卡片的套装，它们共同构成卡片的内容。

PlayingCard.h

#import <Foundation/Foundation.h>
#import "Card.h"
@interface PlayingCard : NSObject

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

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

- (NSString *)contents;
@end

PlayingCard.m

#import "PlayingCard.h"

@implementation PlayingCard

- (NSString *)contents
{
    NSArray *rankStrings = [PlayingCard rankStrings];
    return [rankStrings[self.rank] stringByAppendingString:self.suit];
}

@synthesize suit = _suit;

+(NSArray *)validSuits{
    return @[@"♥", @"♦", @"♠", @"♣"] ;
}

+(NSArray *)rankStrings{
    return  @[@ "?", @"A", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9",@"10", @"J", @"Q", @"K"];

}
-(void)setSuit:(NSString *)suit
{
    if([[PlayingCard validSuits] containsObject:suit]){
        _suit = suit;
    }
}

-(NSString *)suit{
    return _suit ? _suit: @"?";
}

+ (NSUInteger)maxRank {
    return [self rankStrings].count-1;
}

-(void)setRank:(NSUInteger)rank{
    if(rank <= [PlayingCard maxRank]) {
        _rank = rank;
    }
}
@end

最后我的ViewController.m

#import "CardGameViewController.h"
#import "Card.h"
#import "Deck.h"
#import "PlayingCard.h"

@interface CardGameViewController ()
@property (weak, nonatomic) IBOutlet UILabel *flipsLabel;
@property (nonatomic) int flipCount;
@property (nonatomic) NSString *title;
@property (weak, nonatomic) IBOutlet UIButton *cardRandom;
@end

@implementation CardGameViewController

- (void)setFlipCount:(int)flipCount
{
    _flipCount = flipCount;
    self.flipsLabel.text = [NSString stringWithFormat:@" Flips:%d", self.flipCount ];
}

- (IBAction)flipCard:(UIButton *)sender
{

    if(sender.isSelected) {
        sender.selected = NO;
        self.flipCount ++;
    }
    else{
        sender.selected = YES;
        self.flipCount ++;         
    }
}

@end

我研究了这个，我发现我应该使用

- (void)setTitle:(NSString *)title forState:(UIControlState)state

其中状态为UIControlStateSelected，因为包含内容的卡的正面是按钮的选定内容，但我不知道如何根据我的模型开发的随机卡内容设置标题。

Answer 1

让我们假设你的CardGameViewController中有一个Deck类（称为cardDeck）的属性，并且你已经使用addCard方法用卡填充了该属性。现在，当用户点击翻转按钮时，你应该做这样的事情::

- (IBAction)flipCard:(UIButton *)sender
{

  //draw a random card
  Card *randomCard = [self.cardDeck drawRandomCard];

  //set the button title
  [sender setTitle:[randomCard contents] forState:UIControlStateSelected];

  if(sender.isSelected) {
    sender.selected = NO;
    self.flipCount ++;
  }
  else{
    sender.selected = YES;
    self.flipCount ++;         
  }
}

希望这有帮助

PS :: drawRandomCard方法有一个返回类型“Card”，它似乎应该是“PlayingCard”，或者PlayCard类应该被命名为Card。

Answer 2

您没有初始化您的扑克牌。您的ViewController.m文件应该如下所示（我在flipCard方法中显示所有卡后我也重置了套牌）：

    #import "CardViewViewController.h"
    #import "PlayingCardDeck.h"

    @interface CardViewViewController ()
    @property (weak, nonatomic) IBOutlet UILabel *flipsLabel;
    @property (nonatomic) int flipCount;
    @property (nonatomic) PlayingCardDeck *myDeck;
    @end
    @implementation CardViewViewController
    -(PlayingCardDeck *)myDeck
    {
        if(!_myDeck) _myDeck=[[PlayingCardDeck alloc] init];
        return _myDeck;
    }

    -(void)setFlipCount:(int)flipCount
    {
        _flipCount= (int) flipCount;
        self.flipsLabel.text=[NSString stringWithFormat:@"Flips: %d",self.flipCount];
    }
    - (IBAction)flipCard:(UIButton *)sender
    {
        if (!sender.isSelected)
        {
            if (self.flipCount >= 52)
            {
                self.flipCount = 0;
                self.myDeck = nil;
            }
            Card *cCard = [self.myDeck drawRandomCard];
            [sender setTitle: [cCard contents] forState:UIControlStateSelected];
            self.flipCount++;
        }
        sender.selected = !sender.isSelected;
    }

@end

随机更改UIButton（在本例中为扑克牌）的标题

2 个答案: