AFNetworking存储器

Question

使用AFNetworking从服务器下载文件。下面是代码：

self.networkQueue = [[[NSOperationQueue alloc] init] autorelease];
[networkQueue setMaxConcurrentOperationCount:3];

for(NSDictionary* fileDictionary in self.syncArray) {
    @autoreleasepool {

        if([[fileDictionary allKeys] containsObject:@"downloadZipURL"]) {
            NSString* downloadPath = [fileDictionary objectForKey:@"downloadZipURL"];
            downloadPath = [downloadPath stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
            NSURLRequest *requestURL = [NSURLRequest requestWithURL:[NSURL URLWithString:downloadPath]];

            NSString* localDestPath = [NSString stringWithFormat:@"%@/%@", [FileUtil userDocumentsDirectory], [downloadPath lastPathComponent]];
            NSString* localTempPath = [NSString stringWithFormat:@"%@.tmp", localDestPath];
            [(NSMutableDictionary*)fileDictionary setObject:localDestPath forKey:@"downloadDestination"];

            AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:requestURL];
            operation.outputStream = [NSOutputStream outputStreamToFileAtPath:localDestPath append:NO];
            operation.userInfo = fileDictionary;

            [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
                if (networkQueue.operationCount == 0)
                {
                    if(hasDownloadError || isCancellingSync) {
                        return ;
                    }

                    [self performSelectorInBackground:@selector(processAllFiles) withObject:nil];

                }

            } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                NSLog(@"Error: %@", error);
            }];

            //            [operation setDownloadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
            //                NSLog(@"Sent %lld of %lld bytes, %@", totalBytesWritten, totalBytesExpectedToWrite, localDestPath);
            //                float progress = (float)totalBytesWritten/(float)totalBytesExpectedToWrite;
            //                [(NSMutableDictionary*)operation.userInfo setObject:[NSString stringWithFormat:@"Downloading %.0f%%", progress*100] forKey:@"downloadStatus"];
            //                [(NSMutableDictionary*)operation.userInfo setObject:[NSNumber numberWithFloat:progress] forKey:@"downloadProgress"];
            //                [syncViewController onPermitUpdated];
            //            }];

            [networkQueue addOperation:operation];
        }
    }
}

我的问题是，一旦运行了这些代码，内存就会慢慢消耗殆尽，永远不会返回。现在，这些文件可以是大文件，这就是我使用outputStream的原因。

如有任何建议，将不胜感激。

Answer 1

从我头上-我看到你不是在用ARC。

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:requestURL]

你要在某个地方发布这个行动吗？

 [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
                if (networkQueue.operationCount == 0)
                {
                    if(hasDownloadError || isCancellingSync) {
                        return ;
                    }

                    [self performSelectorInBackground:@selector(processAllFiles) withObject:nil];

                }

在这里，您在completionBlock中使用completionBlock，而块保留networkQueue，然后将操作添加到networkQueue中，后者保留操作，这导致两个操作都不释放。尝试创建networkQueue的一个弱变量，并使用它来打破循环。

如果这些不工作，运行仪器，并记录下哪些对象留在内存中，以及它们的引用计数何时更改。