Two ways iOS calls the system to send text messages

1. Use the system to send text messages outside the program

This method is actually quite simple and calls openURL directly:

NSURL *url = [NSURL URLWithString:@"sms://15888888888"];
[[UIApplication sharedApplication]openURL:url];

2. Call the system to send SMS within the program

One benefit of this approach is that users can return to App after sending a text.

First import MessageUI.framework and introduce the header file:

#import <MessageUI/MessageUI.h>

Then follow the proxy MFMessageComposeViewControllerDelegate And implement the proxy method.

#pragma mark -  Proxy method 
-(void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result
{
  [self dismissViewControllerAnimated:YES completion:nil];
  switch (result) {
    case MessageComposeResultSent:
      // Successful transmission of information 
       
      break;
    case MessageComposeResultFailed:
      // Transmission failure 
       
      break;
    case MessageComposeResultCancelled:
      // The message was canceled by the user 
       
      break;
    default:
      break;
  }
}

Send short message method implementation

#pragma mark -  Sending SMS messages 
-(void)showMessageView:(NSArray *)phones title:(NSString *)title body:(NSString *)body
{
  if( [MFMessageComposeViewController canSendText] )
  {
    MFMessageComposeViewController * controller = [[MFMessageComposeViewController alloc] init];
    controller.recipients = phones;
    controller.navigationBar.tintColor = [UIColor redColor];
    controller.body = body;
    controller.messageComposeDelegate = self;
    [self presentViewController:controller animated:YES completion:nil];
    [[[[controller viewControllers] lastObject] navigationItem] setTitle:title];// Modify the title of the SMS interface 
  }
  else
  {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@" Prompt information "
                            message:@" The device does not support SMS "
                            delegate:nil
                       cancelButtonTitle:@" determine "
                       otherButtonTitles:nil, nil];
    [alert show];
  }
}

Finally, call the method that sends the message

[self showMessageView:[NSArray arrayWithObjects:@"15888888888",@"12399999999", nil] title:@"test" body:@" This is a test with SMS, do not reply! "];

Above is the site to introduce the iOS call system to send SMS two ways, I hope to help you.