AFNetworking waitUntilFinished是否会阻塞UI线程？谢谢

Question

+ (NSData *)postData:(NSDictionary *)dict url:(NSString *)url
{
    NSData *data =  [NSJSONSerialization dataWithJSONObject:dict options:0 error:nil];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
    [request setHTTPMethod:@"POST"];    
    [request setValue:[NSString stringWithFormat:@"%lu", (unsigned long)data.length] forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:data];
    
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    }];
    
    [operation start];
    [operation waitUntilFinished];
    return [operation responseData];//这里会不会阻塞UI线程，在执行failure块的时候，会不会发生闪退？
}

Answer 1

不会，AFNetworking是运行在非主线程中的

http://stackoverflow.com/a/16918374/1324208