在 ios 上通过 Twilio 发送短信？

我怎么能够通过 twilio 发送短信 https://www.twilio.com/docs/api/rest，我已经尝试过并正在执行以下操作。

- (IBAction)sendButtonPressed:(id)sender 
 {
    NSLog(@"Sending request.");

    // Common constants
    NSString *kTwilioSID = delegate.sessionId;
    NSString *kTwilioSecret = delegate.twilioToken;
    NSString *kFromNumber = delegate.twlioNumber;
    NSString *kToNumber = @"+14126620408";
    NSString *kMessage = @"Hi there......";

    // Build request
    NSString *urlString = [NSString stringWithFormat:@"https://%@:%@@api.twilio.com/2010-04-01/Accounts/%@/SMS/Messages", kTwilioSID, kTwilioSecret, kTwilioSID];

    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:url];
    [request setHTTPMethod:@"POST"];

    // Set up the body
    NSString *bodyString = [NSString stringWithFormat:@"From=%@&To=%@&Body=%@", kFromNumber, kToNumber, kMessage];
    NSData *data = [bodyString dataUsingEncoding:NSUTF8StringEncoding];
    [request setHTTPBody:data];
    NSError *error;
    NSURLResponse *response;
    NSData *receivedData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

    // Handle the received data
    if (error) {
        NSLog(@"Error: %@", error);
    } else {
        NSString *receivedString = [[NSString alloc]initWithData:receivedData encoding:NSUTF8StringEncoding];
        NSLog(@"Request sent. %@", receivedString);
    }     
 }

并收到错误：操作无法完成。 （kCFErrorDomainCFNetwork 错误-1012。 请帮助解决这个问题，或者与我分享任何帮助材料。提前致谢。

根据这个答案 https://stackoverflow.com/a/3798846/329700，错误 1012 表示用户取消了身份验证请求。

这只是一种预感，但您可能想通过添加如下授权标头来尝试使用 HTTP 基本身份验证：Objective-c HTTP 基本身份验证 https://stackoverflow.com/questions/4120311/objective-c-http-basic-authentication而不是在 URL 字符串中包含凭据，这依赖于 Objective C 库将它们正确地转换为标头。