目標C塊內的塊產生泄漏。我該如何解決它？

Question

這段代碼爲什麼會產生泄漏？它怎麼能解決？

這是原始呼叫：

NSString * url = @"https://theserverurl/user/login" ; 
NSDictionary *parameters = @{@"login":@"the-email@mail.com", @"password":@"encrypted-password"} ; 


[[BackEndAPI sharedManager] NSURLSessionOperation: @"POST" url: url parameters: parameters success:^(NSURLRequest *request, NSHTTPURLResponse * response, id responseObject) { 
    // Success 
} failure:^(IDLEngineError *engineError) { 
    // Failure   
}] ; 

這是處理NSURL要求單身：

- (NSMutableURLRequest *) NSURLSessionOperation:(NSString *) restOperation 
              url:(NSString *)url 
             parameters:(id)parameters 
             success:(void (^)(NSMutableURLRequest *request, NSHTTPURLResponse * response, id responseObject))success 
             failure:(void (^)(IDLEngineError *))failure { 


    NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration]; 

    __weak id weakSelf = self ; 

    // POST 
    if ([restOperation isEqualToString:@"POST"]) { 

     NSError *error; 
     NSURLSession *session = [NSURLSession sessionWithConfiguration: sessionConfig ]; 

     // Create the request 
     __block NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: url ] ]; 
     [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"] ; 
     request.HTTPMethod = @"POST"; 
     NSData *postData = [NSJSONSerialization dataWithJSONObject: parameters options: 0 error:&error]; 
     [request setHTTPBody:postData]; 

     // Perform operation 
     NSURLSessionDataTask * task = [session dataTaskWithRequest: request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 

      // This generates a leak!!!! 
      success(request, nil, nil) ; 

     }] ; 

     [task resume] ; 

    } 


    return nil ; 


} 

請看看到GitHub上泄露的應用：

https://github.com/arkyxperience/myleakedapp

在此處查找報告（屏幕截圖）comin克從儀器：

Answer 1

原來的泄漏與NSURLSessionDataTask。如果你隔離下面的一段代碼，泄漏將保持：

NSString * url = @"https://theserverurl/user/login" ; 
NSDictionary *parameters = @{@"login":@"the-email@mail.com", @"password":@"encrypted-password"} ; 

NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration]; 

NSError *error; 
NSURLSession *session = [NSURLSession sessionWithConfiguration: sessionConfig ]; 


// Create the request 
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: url ] ]; 
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"] ; 
request.HTTPMethod = @"POST"; 
NSData *postData = [NSJSONSerialization dataWithJSONObject: parameters options: 0 error:&error]; 
[request setHTTPBody:postData]; 

// Perform operation 
NSURLSessionDataTask * task = [session dataTaskWithRequest: request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 

}] ; 

[task resume] ; 

我做錯了什麼？

Answer 2

好吧，我試過你的github代碼，看起來好像沒有泄漏。畢竟什麼東西在泄漏？要測試此代碼，請將恢復ID添加到您的控制器。在這個代碼中，即使我不使用弱調用控制器，也會觸發dealloc。所以控制器沒有泄漏，完整的塊沒有保留循環。在NSURLSessionOperation:中沒有看到任何可能泄漏的東西。那麼泄漏到底是什麼？

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    NSString * url = @"https://google.com" ; 
    NSDictionary *parameters = @{@"login":@"the-email@mail.com", @"password":@"encrypted-password"} ; 
    [[BackEndAPI sharedManager] NSURLSessionOperation: @"POST" url: url parameters: parameters success:^(NSURLRequest *request, NSHTTPURLResponse * response, id responseObject) { 
     NSLog(@"finish"); 
     dispatch_async(dispatch_get_main_queue(), ^{ 
      self.view.window.rootViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController"]; 
     }); 

    } failure:^(NSError * error) { 
     NSLog(@"fail"); 
    }]; 
} 

- (void)dealloc { 
    NSLog(@"Did dealloc"); 
}