ios - Make NSOperationQueue synchronous -

how can make nsoperationqueue synchronous? did tried subclassing nsoperation , setting "setmaxconcurrentoperationcount" 1. , adding dependencies on previous operations using "adddependency" method.

adding code:

if(!operationqueue) {     operationqueue = [[myqueue alloc] init]; } [operationqueue setmaxconcurrentoperationcount:1]; uploadfileoperation *uploadfileoperation = [[uploadfileoperation alloc] initwithobject:someobject]; [operationqueue addoperation:uploadfileoperation]; 

now when log upload progress 2 files shows both files uploading @ same time. this: file1 - 17.647026% uploaded file1 - 18.352907% uploaded file2 - 0.870381% uploaded file2 - 1.740762% uploaded file2 - 2.611142% uploaded file2 - 3.481523% uploaded file1 - 19.058788% uploaded

edit 2: how implemented nsoperation main method:

- (void)main { @autoreleasepool {     if(self.iscancelled)     {         return;     }      [[[networkmanager alloc] init] uploadfiletoamazon:someurl withrequesttype:networkrequesttype withcompletion:^(networkrequesttype _networkrequesttype, id response, nserror *error) {         nslog(@"response: %@", response);         nslog(@"error: %@", error);        if(uploadfiledelegate && [uploadfiledelegate respondstoselector:@selector(fileuploaded:)])        {            [uploadclipdelegate fileuploaded:response];        }     }]; } } 

i'm using "afamazons3manager" uploading files in "uploadfiletoamazon".