我如何通过 twilio 发送短信,我已经尝试过并正在做以下事情。
- (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);
    }     
 }
并得到错误:操作无法完成。(kCFErrorDomainCFNetwork 错误 -1012。请帮助解决此问题,或与我分享任何帮助材料。在此先感谢。