如何在iPhone中创建短信应用程序

this question cannot prepopulate the body of an SMS message

as documented by Apple

#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMessageComposeViewController.h>

@interface YourViewController: UIViewController <MFMessageComposeViewControllerDelegate>

- (void)viewDidLoad {
    [super viewDidLoad];

SMSLabel = [[UILabel alloc] initWithFrame:CGRectMake(30.0, 340.0, 260.0, 30.0)];
    SMSLabel .frame = CGRectMake(30.0, 340.0, 260.0, 30.0);
    SMSLabel .adjustsFontSizeToFitWidth = YES;
    SMSLabel .hidden = YES;
    SMSLabel .text = @"";
    SMSLabel .userInteractionEnabled = NO;
    SMSLabel.alpha=0.0;
    [self.view addSubview:SMSLabel ];  


}

-(void)ComposerSheet 
{
    MFMessageComposeViewController *picker = [[MFMessageComposeViewController alloc] init];
    picker.messageComposeDelegate = self;

    picker.recipients = [NSArray arrayWithObject:@"1234567"];  
    picker.body = @"iPhone OS4";

    [self presentModalViewController:picker animated:YES];
    [picker release];

}

- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result {
    SMSLabel.alpha=1.0;

    switch (result)
    {
        case MessageComposeResultCancelled:
            SMSLabel .text = @"Result: canceled";
            NSLog(@"Result: canceled");
            break;
        case MessageComposeResultSent:
            SMSLabel .text = @"Result: sent";
            NSLog(@"Result: sent");
            break;
        case MessageComposeResultFailed:
            SMSLabel .text = @"Result: failed";
            NSLog(@"Result: failed");
            break;
        default:
            SMSLabel .text = @"Result: not sent";
            NSLog(@"Result: not sent");
            break;
    }

    [self dismissModalViewControllerAnimated:YES];

}

free sms apis ZeepMobile

    NSString *phoneToCall = @"sms:";
NSString *phoneToCallEncoded = [phoneToCall stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
NSURL *url = [[NSURL alloc] initWithString:phoneToCallEncoded];
[[UIApplication sharedApplication] openURL:url];