用短信进行分享一段文字

以下是群里有个兄弟回答的，我就顺便先把记下来，说不定日后会有用：

// 短信分享

- (void) shareBySms:(id)viewController  withContent:(NSString*)content
{
    //短信推荐
    Class messageClass = (NSClassFromString(@"MFMessageComposeViewController"));
    if (messageClass != nil)
    {
        if ([messageClass canSendText])
        {
            [self displaySMSComposerSheet:viewController  withContent: content];
        }
        else
        {
            UIAlertView *alertView = [[[UIAlertView alloc] initWithTitle:@"华商圈" message:@"您的设备不支持短信功能" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil] autorelease];
            [alertView show];
        }
    }
    else
    {
        UIAlertView *alertView = [[[UIAlertView alloc] initWithTitle:@"华商圈" message:@"您的设备不支持短信功能！" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil] autorelease];
        [alertView show];
    }
}




-(void)displaySMSComposerSheet:(id)viewController  withContent:(NSString*)content
{
     // 此处能autorelease 
    MFMessageComposeViewController *controller = [[[MFMessageComposeViewController alloc] init] autorelease];
    if (controller)
    {
        controller.body = content;
        controller.messageComposeDelegate = self;
        [(UIViewController*)viewController presentModalViewController:controller animated:YES];
    }
}




//短信发送  回调的协议方法
-(void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result
{
    switch (result)
    {
        case MessageComposeResultCancelled:
            NSLog(@"Result: SMS sending canceled");
            if(_shareDelegate && [_shareDelegate respondsToSelector:@selector(onShareFault:)])
            {
                [_shareDelegate onShareFault:@"取消发送短信"];
            }
            break;
        case MessageComposeResultSent:
            NSLog(@"Result: SMS sent");
            if(_shareDelegate && [_shareDelegate respondsToSelector:@selector(onShareSuccess:)])
            {
                [_shareDelegate onShareSuccess:@"短信已发送成功"];
            }
            break;
        case MessageComposeResultFailed:
            if(_shareDelegate && [_shareDelegate respondsToSelector:@selector(onShareFault:)])
            {
                [_shareDelegate onShareFault:@"短信发送失败"];
            }
            break;
        default:
            if(_shareDelegate && [_shareDelegate respondsToSelector:@selector(onShareFault:)])
            {
                [_shareDelegate onShareFault:@"短信发送失败"];
            }
            break;
    }
    [controller dismissModalViewControllerAnimated:YES];
}