ios - 模型初始化时应用程序启动时出现无限循环和访问错误

Question

请帮忙....我正在努力解决这个问题。 我是 iOS 的新手，所以如果这很明显，请不要对我太苛刻! ;)

我正在使用 xcode 4.6 并以 iPhone6.1 模拟器为目标。

启动我的应用程序时出现以下错误:

EXC_BAD_ACCESS code = 2

Debug Navigator 中出现了数百个线程，这导致人们相信某处存在某种无限循环(我只是看不到哪里)。

错误发生在 PlayingCardDeck.m 中的 (id)init 旁边，在从 ViewController.m 进入后，在行:

Card *card = [self.deck drawRandonCard];

查看 Controller :

#import "ViewController.h"

#import "PlayingCardDeck.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UILabel *flipsLabel;
@property (nonatomic) int flipCount;
@property (strong, nonatomic) Deck *deck;
@property (strong, nonatomic) IBOutletCollection(UIButton) NSArray *cardButtons;

@end

@implementation ViewController

@synthesize deck = _deck;

- (IBAction)flipCard:(UIButton *)sender {
    sender.selected = !sender.isSelected;
    self.flipCount++;
}

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

- (Deck *)deck
{
    if (!_deck) _deck = [[PlayingCardDeck alloc] init];
    return _deck;
}

- (void)setCardButtons:(NSArray *)cardButtons
{
    _cardButtons = cardButtons;
    for (UIButton *cardButton in cardButtons)
    {
        Card *card = [self.deck drawRandonCard];
        [cardButton setTitle:card.contents forState:UIControlStateSelected];
    }
}

@end

甲板.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 (atTop)
    {
        [self.cards insertObject:card atIndex:0];
    }
    else
    {
        [self.cards addObject:card];
    }
}

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

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

    return randomCard;
}

@end

PlayingCardDeck.m

#import "PlayingCardDeck.h"
#import "PlayingCard.h"

@implementation PlayingCardDeck

- (id)init
{
    self = [self init];

    if (self)
    {
        for (NSString *suit in [PlayingCard validSuits])
        {
            for (NSUInteger rank=1; rank <= [PlayingCard maxRank]; rank++)
            {
                PlayingCard *card = [[PlayingCard alloc] init];
                card.suit = suit;
                card.rank = rank;
                [self addCard:card atTop:YES];
            }
        }
    }

    return self;
}

@end

Answer 1

在 PlayerCardDeck.m 中 self = [self init] 应该是 self = [super init]。这导致了无限循环。