遵循以下步骤

1 .添加消息i。项目框架

2。在.h文件中导入# Import <MessageUI/MessageUI.h>。

3.复制此代码以发送消息

 if ([MFMessageComposeViewController canSendText]) {
    MFMessageComposeViewController *messageComposer =
    [[MFMessageComposeViewController alloc] init];
    NSString *message = @"Message!!!";
    [messageComposer setBody:message];
    messageComposer.messageComposeDelegate = self;
    [self presentViewController:messageComposer animated:YES completion:nil];
}

4所示。实现委托方法，如果你想。

- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result{


   ///your stuff here 

    [self dismissViewControllerAnimated:YES completion:nil];
}

快跑!

你可以使用这种方法:

[[UIApplication sharedApplication]openURL:[NSURL URLWithString:@"sms:MobileNumber"]]

iOS会自动从你的应用程序导航到消息应用程序的消息合成页面。由于URL的方案是从sms:开始的，这被标识为消息应用程序可以识别的类型，并启动它。

如果您愿意，您可以使用名为CTMessageCenter类的私有框架CoreTelephony。有一些发送短信的方法。

用这个:

- (void)showSMSPicker
{
    Class messageClass = (NSClassFromString(@"MFMessageComposeViewController"));

    if (messageClass != nil) {          
        // Check whether the current device is configured for sending SMS messages
        if ([messageClass canSendText]) {
           [self displaySMSComposerSheet];
        }   
    }
}

- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result
{       
    //feedbackMsg.hidden = NO;
    // Notifies users about errors associated with the interface
    switch (result)
    {
        case MessageComposeResultCancelled:
        {   
            UIAlertView *alert1 = [[UIAlertView alloc] initWithTitle:@"Message" message:@"SMS sending canceled!!!" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
            [alert1 show];
            [alert1 release];
        }   

        // feedbackMsg.text = @"Result: SMS sending canceled";
        break;

        case MessageComposeResultSent:
        {
            UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:@"Message" message:@"SMS sent!!!" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
            [alert2 show];
            [alert2 release];
        }   

        // feedbackMsg.text = @"Result: SMS sent";
        break;

        case MessageComposeResultFailed:
        {   
            UIAlertView *alert3 = [[UIAlertView alloc] initWithTitle:@"Message" message:@"SMS sending failed!!!" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
            [alert3 show];
            [alert3 release];
        }   

        // feedbackMsg.text = @"Result: SMS sending failed";
        break;

        default:
        {   
            UIAlertView *alert4 = [[UIAlertView alloc] initWithTitle:@"Message" message:@"SMS not sent!!!" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
            [alert4 show];
            [alert4 release];
        }   

        // feedbackMsg.text = @"Result: SMS not sent";
        break;
    }

    [self dismissModalViewControllerAnimated: YES];
}

[[UIApplication sharedApplication]openURL:[NSURL URLWithString:@"sms:number"]] 

这将是最好和最简单的方法。

您可以使用sms:[目标电话号码]URL打开sms应用程序，但没有指示如何用文本预填充sms正文。