iOS 融云获取token

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];    NSDictionary *dict = @{@"userId":@"11", @"name":@"zs", @"portraitUri":@"http://www.baidu.com/a.png"};    NSString *timestamp = [[NSString alloc] initWithFormat:@"%ld",(NSInteger)[NSDate timeIntervalSinceReferenceDate]];    NSString *nonce = [NSString stringWithFormat:@"%d",arc4random()];#warning 从你的控制台获得    NSString *appkey = @"从你的控制台获得";    NSString *SignatureWillMD5 = [NSString stringWithFormat:@"%@%@%@",appkey,nonce,timestamp];    NSString *Signature = [self MD5String:SignatureWillMD5];    [manager.requestSerializer setValue:appkey forHTTPHeaderField:@"App-Key"];    [manager.requestSerializer setValue:nonce forHTTPHeaderField:@"Nonce"];    [manager.requestSerializer setValue:timestamp forHTTPHeaderField:@"Timestamp"];    [manager.requestSerializer setValue:Signature forHTTPHeaderField:@"Signature"];#warning 从你的控制台查看    [manager.requestSerializer setValue:@"从你的控制台获得" forHTTPHeaderField:@"appSecret"];    [manager.requestSerializer setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];    [manager POST:RONGCLOUD_URL parameters:dict success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {                if ([responseObject[@"code"] integerValue] == 200)        {            // 获取到token        }            } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {                if (error)        {            // token失效等        }            }];