- (void)showMessageViewWithTel:(NSString *)tel{        if( [MFMessageComposeViewController canSendText] ){                MFMessageComposeViewController * controller = [[MFMessageComposeViewController alloc]init]; //autorelease];                controller.recipients = [NSArray arrayWithObject:tel];        controller.body = @"";        controller.messageComposeDelegate = self;                [self presentViewController:controller animated:YES completion:nil];                        [[[[controller viewControllers] lastObject] navigationItem] setTitle:@"测试短信"];//修改短信界面标题    }else{                [self alertWithTitle:@"提示信息" msg:@"设备没有短信功能"];    }}//MFMessageComposeViewControllerDelegate- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result{        [controller dismissViewControllerAnimated:NO completion:nil];//关键的一句   不能为YES        switch ( result ) {                    case MessageComposeResultCancelled:                        [self alertWithTitle:@"提示信息" msg:@"发送取消"];            break;        case MessageComposeResultFailed:// send failed            [self alertWithTitle:@"提示信息" msg:@"发送失败"];            break;        case MessageComposeResultSent:            [self alertWithTitle:@"提示信息" msg:@"发送成功"];            break;        default:            break;    }}- (void) alertWithTitle:(NSString *)title msg:(NSString *)msg {            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title                                                    message:msg                                                   delegate:self                                          cancelButtonTitle:nil                                          otherButtonTitles:@"确定", nil];        [alert show];    }