仅在设备上运行应用程序时崩溃问题

Question

所以我有一个非常奇怪的问题，当我在模拟器上运行我的应用程序并插入 iPad（在插入电缆的设备上运行应用程序）时，一切正常。但是，在插入设备后在设备上运行并尝试使用该应用程序后，它崩溃了..尝试查看设备崩溃日志，我看到了：

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libobjc.A.dylib                 0x3672bf78 objc_msgSend + 16
1   App                     0x000ca834 -[AHAppImageData dealloc] (AHInstagramImageData.m:122)
2   libobjc.A.dylib                 0x3672d16e _objc_rootRelease + 30
3   CoreFoundation                  0x33d792e0 CFRelease + 88
4   CoreFoundation                  0x33d8ea30 -[__NSArrayM removeObjectAtIndex:] + 288
5   CoreFoundation                  0x33d84adc -[NSMutableArray removeAllObjects] + 64
6   App                     0x000f717e -[AHImageDataSource clearDataSource] (AHImageDataSource.m:53)
7   App                     0x000c0a36 __49-[AHMainViewController loadRequestWithURLString:]_block_invoke_0 (AHMainViewController.m:91)
8   libdispatch.dylib               0x32658c52 _dispatch_call_block_and_release + 6
9   libdispatch.dylib               0x3265aee0 _dispatch_main_queue_callback_4CF$VARIANT$mp + 188
10  CoreFoundation                  0x33e032a6 __CFRunLoopRun + 1262
11  CoreFoundation                  0x33d8649e CFRunLoopRunSpecific + 294
12  CoreFoundation                  0x33d86366 CFRunLoopRunInMode + 98
13  GraphicsServices                0x37d68432 GSEventRunModal + 130
14  UIKit                           0x36820cce UIApplicationMain + 1074
15  App                     0x000b2860 main (main.m:16)
16  App                     0x000b2820 0xb1000 + 6176

知道为什么这只发生在设备上而不是在插入或模拟器运行应用程序时发生吗？

根据下面的评论，我将展示负责此问题的代码：

 [[AHMyAppAPIClient sharedClient] getPath:requestURLPath parameters:nil 
             success:^(AFHTTPRequestOperation *operation, id response) {
                 [self.progressHUD_ hide:YES];


                 self.nextPaginationURL_ = [[response valueForKey:@"pagination"] valueForKey:@"next_url"];

                 [self.collectionView_.pullToRefreshView stopAnimating];
                 [[NSOperationQueue sharedOperationQueue] cancelAllOperations];


                 NSArray *arr = [response valueForKey:@"data"];
                 if ([arr count] > 0){
                     [[AHImageDataSource sharedDataSource] clearDataSource];
                 }


                for (NSDictionary * data in arr){
                     AHInstagramImageData * imgData = [[AHInstagramImageData alloc] initWithData:data];
                     [[AHImageDataSource sharedDataSource] addObject:imgData];
                     [imgData release];
                 }


                 dispatch_async(dispatch_get_main_queue(), ^{
                     [self.collectionView_ setContentOffset:CGPointMake(0, 0)];
                     [self.collectionView_ reloadData];

                 });

             }
             failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                 [self.progressHUD_ hide:YES];
                 NSLog(@"Error fetching user data!");
                 NSLog(@"%@", error);      

             }];

这是我设置数据源的方式：

extern NSString * const kClearDataSource;

@interface AHImageDataSource : NSObject
+ (AHImageDataSource *)sharedDataSource;
- (void) clearDataSource;
- (void) addObject:(id) object;
- (void) addObject:(id)object atIndex:(int) index;
- (int) count;
- (id) objectAtIndex:(int) index;
@end


NSString * const kClearDataSource = @"clearDataSource";

@interface AHImageDataSource()
{
    NSMutableArray * imageDataSource_;
}

@property (nonatomic, retain) NSMutableArray * imageDataSource_;

@end

@implementation AHImageDataSource
@synthesize imageDataSource_;

+ (AHImageDataSource *)sharedDataSource {
    static AHImageDataSource *_sharedClient = nil;
    static dispatch_once_t oncePredicate;
    dispatch_once(&oncePredicate, ^{
        _sharedClient = [[self alloc] init];
    });

    return _sharedClient;
}


- (id)init {
    self = [super init];
    if (!self) {
        return nil;
    }

    NSMutableArray * temp = [[NSMutableArray alloc] initWithCapacity:200];
    self.imageDataSource_  = temp;
    [temp release];


    return self;
}

-(void) clearDataSource
{
    if ([self.imageDataSource_ count] > 0){
        [self.imageDataSource_ removeAllObjects];
    }

}

- (void) addObject:(id) object
{
    [self.imageDataSource_ addObject:object];
}

- (void) addObject:(id)object atIndex:(int) index
{
    [self.imageDataSource_ insertObject:object atIndex:index];
}

- (int) count
{
    return [self.imageDataSource_ count];
}

- (id) objectAtIndex:(int) index
{
    if (index >= 0 && index < [self.imageDataSource_ count]){
        return [self.imageDataSource_ objectAtIndex:index];
    } 

    return nil;
}

- (void) dealloc
{
    [super dealloc];
    [imageDataSource_ release];
}

@end

编辑：

似乎 NSZombieEnabled 似乎隐藏了这个问题。当我禁用 NSZombieEnabled 时，它现在会在模拟器和设备上崩溃。

Answer 1

我同意吉姆的观点，看起来像是双重释放。

我会利用 Instruments 'zombie' 配置文件来测试这种情况。它只能在模拟器中完成，但应该准确地向您展示正在双重发布的内容。

一旦 100% 清楚，解决问题通常很容易。

Answer 2

看起来您通过将AHInstagramImageData 的实例放入字典中过度释放它，然后将保留计数降低到足以将其释放。然后，当它从字典中删除时，它会再次被释放并尝试为不再存在的对象释放内存。

发布负责的代码，您可能会获得更详细的帮助。仅靠崩溃日志是不够的。