AVWeakReferencingDelegateStorage：委託序列化隊列

自iOS 10更新以來，我目前遇到了iOS應用程序的新問題。這個問題只發生在iOS 10及以上版本的設備上。完整的崩潰日誌如下：AVWeakReferencingDelegateStorage：委託序列化隊列

Crashed: <AVWeakReferencingDelegateStorage: 0x170229fc0> delegate serialization queue 
0 libdispatch.dylib    0x18f8121e8 _os_object_retain + 72 
1 libdispatch.dylib    0x18f8111c0 _dispatch_client_callout + 16 
2 libdispatch.dylib    0x18f822584 _dispatch_non_barrier_sync_f_invoke + 84 
3 AVFoundation     0x1980e33ec -[AVWeakReferencingDelegateStorage getRetainedDelegate:retainedDelegateQueue:] + 168 
4 AVFoundation     0x1980e3240 -[AVWeakReferencingDelegateStorage delegate] + 36 
5 AVFoundation     0x1980ce244 -[AVCaptureVideoDataOutput _handleRemoteQueueOperation:] + 76 
6 AVFoundation     0x1980ce168 __47-[AVCaptureVideoDataOutput _updateRemoteQueue:]_block_invoke + 100 
7 CoreMedia      0x1932a0da8 __FigRemoteOperationReceiverCreateMessageReceiver_block_invoke + 260 
8 CoreMedia      0x1932c0020 __FigRemoteQueueReceiverSetHandler_block_invoke.2 + 216 
9 libdispatch.dylib    0x18f8111c0 _dispatch_client_callout + 16 
10 libdispatch.dylib    0x18f81e008 _dispatch_continuation_pop + 576 
11 libdispatch.dylib    0x18f82a648 _dispatch_source_latch_and_call + 204 
12 libdispatch.dylib    0x18f813164 _dispatch_source_invoke + 820 
13 libdispatch.dylib    0x18f81f278 _dispatch_queue_serial_drain + 468 
14 libdispatch.dylib    0x18f8149a8 _dispatch_queue_invoke + 652 
15 libdispatch.dylib    0x18f81f278 _dispatch_queue_serial_drain + 468 
16 libdispatch.dylib    0x18f8149a8 _dispatch_queue_invoke + 652 
17 libdispatch.dylib    0x18f8202ac _dispatch_root_queue_drain_deferred_item + 248 
18 libdispatch.dylib    0x18f826b0c _dispatch_kevent_worker_thread + 816 
19 libsystem_pthread.dylib  0x18fa19174 _pthread_wqthread + 948 
20 libsystem_pthread.dylib  0x18fa18db4 start_wqthread + 4

我在代碼中找到確切位置的代碼崩潰，但現在我知道是什麼原因造成它與iOS 10. 附註：在設備上崩潰它不會在所有iOS 10+設備上崩潰。

的代碼如下：

- (void)forwardToResultsVC:(NSDictionary *)results 
{ 
    self.successfulTestResults = results; 

    NSManagedObjectContext *localContext = [NSManagedObjectContext MR_contextForCurrentThread]; 
    [self.petTest updateTestWithTestElementParameters:results]; 
    [localContext MR_saveOnlySelfAndWait]; 
    [self performSegueWithIdentifier:kTestAnalyzeSeguge sender:nil]; 

    // Log successful test and time it took to take (Parse) 
    NSDate *testCompleteDate = [NSDate date]; 
    NSTimeInterval timeToTakeTest = [testCompleteDate timeIntervalSinceDate:self.testStartDate]; 
    NSDictionary *params = @{ kPetnosticsAnalyticsTimeToTakeSuccesfulTest : [NSString stringWithFormat:@"%f", timeToTakeTest]}; 
    [PFAnalytics trackEvent:kPetnosticsAnalyticsTestSuccesfullyCompleted dimensions:params]; 
} 

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{ 
    if ([segue.identifier isEqualToString:kTestResultsSeguge]) { 
     SPResultsViewController *resultsVC = segue.destinationViewController; 
     resultsVC.test = self.petTest; 
     resultsVC.ogHarrisFoundPointsImage = self.ogHarrisFoundPointsImage; 
     resultsVC.foundTestPointsImage = self.foundTestPointsImage; 
     resultsVC.analysisImage = self.analysisImage; 
     resultsVC.croppedStripImage = self.croppedStripImage; 
     resultsVC.test = self.petTest; 
    } else if ([segue.identifier isEqualToString:kTestAnalyzeSeguge]) { 
     SPAnalyzingViewController *analyzingVC = segue.destinationViewController; 
     analyzingVC.pet = self.pet; 
     analyzingVC.test = self.petTest; 
     analyzingVC.ogHarrisFoundPointsImage = self.ogHarrisFoundPointsImage; 
     analyzingVC.foundTestPointsImage = self.foundTestPointsImage; 
     analyzingVC.analysisImage = self.analysisImage; 
     analyzingVC.croppedStripImage = self.croppedStripImage; 
     analyzingVC.backingCard = self.backingCard; 
     if (self.testMethod == nil) { 
      self.testMethod = @"Cup"; 
     } 
     analyzingVC.testMethod = self.testMethod; 
    } 
}

的賽格瑞然後提示如下：

- (void)viewWillAppear:(BOOL)animated 
{ 
    [super viewWillAppear:animated]; 
    [self saveTestUploadImage]; 
} 

- (void)saveTestUploadImage 
{ 
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{ 
     UIImage *debugImage = self.foundTestPointsImage; 
     NSData *testImageData = nil; 
     if (debugImage) { 
      [debugImage saveImageTofileName:@"testImage.jpg"]; 
      testImageData = UIImageJPEGRepresentation(debugImage, 1); 
     } 
     if ([testImageData length] > 0) { 
      PFFile *imageFile = [PFFile fileWithName:@"testImage.jpg" data:testImageData]; 
      [self uploadTestDataWithImage:imageFile]; 
     } else { 
      // No Test Image Data... hmm... 
      [PFAnalytics trackEvent:@"SPTestNoImageFound"]; 
      [self uploadTestDataWithImage:nil]; 
     } 
    }); 
}

然而，它崩潰被稱爲前saveTestUploadImage。任何想法？先進的謝謝你。

來源

2016-10-06 Eric Salazar

在跟蹤中看到AVCaptureVideoDataOutput，您是否向plist文件添加了相應的授權？ NSCameraUsageDescription，NSPhotoLibraryUsageDescription，尤其是NSMicrophoneUsageDescription，似乎確實讓應用崩潰了正確的崩潰信息。

來源

2016-10-10 22:56:32 SeNeO

這是一個非常好的猜測。我們必須找出類似的問題，我們驚訝地發現，這是因爲我們沒有在plist中指定一個** Privacy：**字符串。 – NRitH

感謝您的貢獻。不幸的是，由於它不會在所有iOS10設備上發生，並且不會每次都發生（它來來去去），所以我無法測試這個理論。該應用在應用商店的iOS 10更新之前發佈。在iOS 10之前，隱私是自動處理的，你認爲新的iOS會將自己與舊應用混淆嗎？ –

在我的情況下，應用程序總是崩潰在ios10設備上的新安裝。我很確定它沒有在iOS10更新之前安裝並啓動應用程序的設備上崩潰。 – SeNeO

AVWeakReferencingDelegateStorage：委託序列化隊列

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