Objective c NSmutualArray中奇怪的NSZombie错误

几天前我遇到了一个奇怪的错误。幸运的是，我在4-5天内解决了这个错误。然而，我只是想知道为什么会发生这种错误

首先，我将用相同的代码示例描述这种情况

@interface SampleViewController ()

@property (nonatomic, strong) NSMutableArray *selectedIssue;
@property (nonatomic, strong) NSOperationQueue *queueJSON;
@property (nonatomic, strong) NSOperationQueue *queueImage;

@end

@implementation SampleViewController

/** blah blah blah*/

- (void) fillIssueArrayMethodWithIssueId:(NSInteger) selectedId {

    NSString *requestURL = [NSString stringWithFormat:@"%@Issues/Get/?id=%d", kAPIRootURL, selectedId];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:requestURL] 
                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData 
                                                       timeoutInterval:kNetworkTimeOut];

    AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    op.responseSerializer = [AFJSONResponseSerializer serializer];

    [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id response) {
        NSData *JSONData = [NSData dataWithContentsOfFile:filePath
                                                  options:NSDataReadingMappedIfSafe 
                                                    error:nil];
        NSMutableArray *responseObject = [NSJSONSerialization JSONObjectWithData:JSONData 
                                                                         options:NSJSONReadingMutableContainers 
                                                                           error:nil];

        if(responseObject) {
            if([responseObject isKindOfClass:[NSArray class]]) {
                _selectedIssue = [NSMutableArray arrayWithArray:responseObject];
            }
        }

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) { }];

    [_queueJSON addOperation:op];
}

-(void)startDownloadImages {

    NSArray *objPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *strPath = [objPaths lastObject];

    if(!_queueImage)
        _queueImage = [[NSOperationQueue alloc] init];

    _queueImage.maxConcurrentOperationCount = 3;

    NSBlockOperation *completionOperation = [NSBlockOperation new];

    for (__block NSDictionary *object in _selectedIssue) {
            // Photos
            NSString *imgURL = object[@"ImageUrl"];
            NSString *strImageFile = [NSString stringWithFormat:@"%@_%@", object[@"Id"], [imgURL lastPathComponent]];
            __block NSString *strImagePath = [NSString stringWithFormat:@"%@/Images/Issues/%@", strPath, strImageFile];

            NSURLRequest *request4Images = [NSURLRequest requestWithURL:[NSURL URLWithString:imgURL]];

            AFHTTPRequestOperation *operation4Images = [[AFHTTPRequestOperation alloc] initWithRequest:request4Images];

            [operation4Images setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id rawResult) {

                 BOOL isImageWrited = [rawResult writeToFile:strImagePath options:NSDataWritingAtomic error:nil];

                 if(isImageWrited) {
                     NSLog(@"Image Write Success : %@", operation.request.URL);
                 } else {
                    NSLog(@"Image Write Error: %@", imageWriteError.description);
                 }

            } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                NSLog(@"Image Write Failed : %@ : %ld", operation.request.URL, (long)operation.response.statusCode);
            }];

            [completionOperation addDependency:operation4Images];
    }

    [_queueImage addOperations:completionOperation.dependencies waitUntilFinished:NO];
    [_queueImage addOperation:completionOperation];
}

@end

这就是问题所在

在应用程序生命周期中，FillIssuarRayMethodWithIssueId方法首先将JSON数据获取到相互数组。然后通过从数组中获取图像URL开始下载图像

每过一秒，我都想用issueid方法访问_selectedissuein fillissuearraymethod，我的应用程序就会崩溃

根据长期的调查，当启动DownloadImages方法完成时，选择的假设立即成为僵尸对象。但是在这个方法中，我从未重新分配过这个数组。我刚刚读取了这个数组中的值。我确信在这种方法中，数组会变成僵尸对象，因此在for循环中移除块时，问题得到了解决

那么问题是，u块类型如何影响u selectedIssue arrays对象

我只想知道我错过了什么

---

顺便说一句，在for循环之前，我已经尝试过StartDownloadImages方法，我已经创建了临时数组，这个临时数组刚刚用_selectedissuemutablecopy或just copy启动。然而，我再次面临僵尸问题。

你的问题很难理解。您这么说，问题在删除时得到了解决。请键入for循环块，但我在您发布的代码中没有看到任何\uu块。@newacct是的，我使用了arc。@特洛伊木马程序\uu块在for语句中