Ios AFN网络下载循环丢失身份验证

因此，我的情况是，在进入主屏幕之前，我必须在iOS应用程序中下载多个视频文件，我正在使用AFNetworking 2。如果我必须下载一个文件，一切正常，但当我必须下载多个文件时，有些文件会因此错误而失败，它并不总是相同的文件，似乎是随机的..：

错误：Error Domain=com.alamofire.Error.serialization.response Code=-1011“请求失败：未经授权（401）”UserInfo=0x7ff943f4fcb0{NSLocalizedDescription=请求失败：未经授权（401），com.alamofire.serialization.response.Error.response=

假设我正在使用此代码：

MainView *mainViewController = [[MainView alloc] init];

NSURLCredential *credential = [NSURLCredential credentialWithUser:AUTH_USERNAME2 password:AUTH_PASSWORD2 persistence:NSURLCredentialPersistenceForSession];

NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager changeCurrentDirectoryPath:self.topVideoPath];


__block int countVideos = 0;
__block int totalvideos = [videoItems count];
for (int i = 0; i < [videoItems count]; i++){

   NSLog(@"dict array : %@" , self.dictArray);
   NSMutableDictionary *itemDict = [self.dictArray objectAtIndex:i];
   NSURL *url = [NSURL URLWithString:[itemDict objectForKey:@"video"]];
   NSString *videoString = [itemDict objectForKey:@"video"];
   NSString *specificPath = [[fileManager currentDirectoryPath] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.dat", [itemDict objectForKey:@"id"]]];
   TopItem *item = [videoItems objectAtIndex:i];

            if (![videoString isEqualToString:@""]) {

                [fileManager changeCurrentDirectoryPath:self.topVideoPath];

                NSString *moviePath = [[fileManager currentDirectoryPath] stringByAppendingPathComponent:[NSString stringWithFormat:@"Movie%@.mp4", [itemDict objectForKey:@"id"]]];
                NSString *correctMoviePath = [NSString stringWithFormat:@"KyoskSkeleton/TopVideo/Movie%@.mp4", [itemDict objectForKey:@"id"]];

                AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:[NSURLRequest requestWithURL:url]];
                [operation setCredential:credential];
                operation.outputStream = [NSOutputStream outputStreamToFileAtPath:moviePath append:NO];
                [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {

                    float progress = ((float)totalBytesRead) / totalBytesExpectedToRead;
                    NSLog(@"The downloading progress : %f", progress);


                }];
                [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

                    countVideos = countVideos + 1;

                    NSLog(@"specific path : %@", specificPath);
                   [NSKeyedArchiver archiveRootObject:item toFile:specificPath];

                    if (countVideos == totalvideos ){
                    mainViewController.topScrollViewContent = self.topScrollViewContent;  
                        if ([self.responseDelegate respondsToSelector:@selector(pushController:)]) {
                            [self.responseDelegate performSelector:@selector(pushController:) withObject:mainViewController];
                        }
                    }
                } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                    NSLog(@"Not Downloaded");
                    NSLog(@"Error : %@", error);

                    countVideos = countVideos + 1;
                }];

                [operation start];
}
}

MainView*mainViewController=[[MainView alloc]init]；
NSURLCredential*credential=[nsurlCredentialCredentialWithUser:AUTH_用户名2密码：AUTH_密码2持久性：NSURLCredentialPersistenceForSession]；
NSFileManager*fileManager=[NSFileManager defaultManager]；
[fileManager changeCurrentDirectoryPath:self.topVideoPath]；
__block int countVideos=0；
__block int totalvideos=[videoItems count]；
对于（int i=0；i<[videoItems count]；i++）{
NSLog（@“dict数组：%@”，self.dictArray）；
NSMutableDictionary*itemDict=[self.dictArray objectAtIndex:i]；
NSURL*url=[NSURL URLWithString:[itemDict objectForKey:@“视频”]；
NSString*videoString=[itemDict objectForKey:@“video”]；
NSString*specificPath=[[fileManager currentDirectoryPath]stringByAppendingPathComponent:[NSString stringWithFormat:@“%@.dat”，[itemDict objectForKey:@“id”]]；
TopItem*item=[videoItems对象索引：i]；
如果（！[videoString IsequalString:@“”）{
[fileManager changeCurrentDirectoryPath:self.topVideoPath]；
NSString*moviePath=[[fileManager currentDirectoryPath]stringByAppendingPathComponent:[NSString stringWithFormat:@“Movie%@.mp4”，[itemDict objectForKey:@“id”]]；
NSString*correctMoviePath=[NSString stringWithFormat:@“KyoskSkeleton/TopVideo/Movie%@.mp4”，[itemDict objectForKey:@“id”]；
AFHTTPRequestOperation*操作=[[AFHTTPRequestOperation alloc]initWithRequest:[NSURLRRequestWithURL:url]]；
[操作设置凭证：凭证]；
operation.outputStream=[NSOutputStream outputStreamToFileAtPath:moviePath-append:NO]；
[operation setDownloadProgressBlock:^（NSUInteger字节读取、long long totalBytesRead、long long totalBytesExpectedToRead）{
浮动进度=（（浮动）totalBytesRead）/totalBytesExpectedToRead；
NSLog（@“下载进度：%f”，进度）；
}];
[操作setCompletionBlockWithSuccess:^（AFHTTPRequestOperation*操作，id响应对象）{
countVideos=countVideos+1；
NSLog（@“特定路径：%@”，specificPath）；
[NSKeyedArchiver archiveRootObject:item-toFile:specificPath]；
如果（countVideos==totalvideos）{
mainViewController.topScrollViewContent=self.topScrollViewContent；
if（[self.responseDelegate respondsToSelector:@selector（pushController:）]））{
[self.responseDelegate performSelector:@selector（pushController:）with object:mainViewController]；
}
}
}失败：^（AFHTTPRequestOperation*操作，NSError*错误）{
NSLog（@“未下载”）；
NSLog（@“错误：%@”，错误）；
countVideos=countVideos+1；
}];
[操作启动]；
}
}

有人知道出了什么问题吗

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提前感谢！

最后我用一个NSOperationque修复了它，maxConcurrentOperationCount=3，所以同一时间只下载了3个视频。可能是服务器的连接太长太多了