iOS Card *card=[self.deck drawRandomCard];引起线程1：信号SIGABRT

Posted 2023-03-16

【中文标题】iOS Card *card=[self.deck drawRandomCard];引起线程1：信号SIGABRT

【英文标题】：iOS Card *card=[self.deck drawRandomCard]; Causing Thread 1:signal SIGABRT

【发布时间】：2015-01-19 08:46:26

【问题描述】：

我正在做斯坦福 ios7 CS193P Lecture2 作业，有一个问题我不明白。有趣的是我第二次翻转卡片时会发生这种情况。 这里是 wraning libc++abi.dylib: terminating with uncaught exception of type NSException

#import "ViewController.h"
#import "PlayingCardDeck.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *fliplabel;
@property(strong,nonatomic)Deck *deck;
@property(nonatomic)int flipscount;
@end

@implementation ViewController
-(void)setFlipscount:(int)flipscount

    _flipscount=flipscount;
    self.fliplabel.text=[NSString stringWithFormat:@"Flips: %d",self.flipscount];


-(Deck *)deck

    if (!_deck)
        _deck=[self createDeck];
        return _deck;



-(Deck *)createDeck;

    return [[PlayingCardDeck alloc] init];


- (IBAction)touchCardButton:(UIButton *)sender 
        if ([sender.currentTitle length]) 
            [sender setBackgroundImage:[UIImage imageNamed:@"cardback"] forState:UIControlStateNormal];
            [sender setTitle:@"" forState:(UIControlStateNormal)];
        else
            Card *card=[self.deck drawRandomCard];
            [sender setBackgroundImage:[UIImage imageNamed:@"cardfront"] forState:UIControlStateNormal];
            [sender setTitle:[card contents] forState:(UIControlStateNormal)];
        


    self.flipscount++;

如果我在 (IBAction)touchCardButton:(UIButton *)sender 中删除 Card *card=[self.deck drawRandomCard] 那么它工作正常，这是怎么发生的，我该如何解决它，有人请帮助我 PS：我没有更改我的标签名称

有我的错误页面：

 int main(int argc, char * argv[]) 
        @autoreleasepool 
            return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
        
    
**Thread1:signal SIGABRT**

这是我的输出：

    25  libdyld.dylib                       0x000000010a412145 start + 1
    26  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

这是我的drawRandomCards：

-(Card *)drawRandomCard

    Card *randomcardCard=nil;
    unsigned index = arc4random() % [self.cards count];
    randomcardCard = self.cards[index];
    [self.cards removeObjectAtIndex:index];
    return randomcardCard;

【问题讨论】：

显示整个错误信息。您能否也显示drawRandomCard 中的内容？

@Larme 我把我的错误信息和 drawRandomCard 放在上面。

如果您转到 Xcode 的断点导航器并在所有 Objective-C 异常上添加断点，该错误应该会导致您停在有用的地方而不是 main() 内。这将引导您找到造成麻烦的实际线路。

顺便问一下，当你遇到错误时，drawRandomCard 中的[self.cards count] 的值是多少？

【参考方案1】：

首先，检查“drawRandomCard”中的“index”值。也许 self.cards 数组没有你要进入的索引

randomcardCard = self.cards[index];