MessageComposeResult UIAlert 未显示

Question

我正在尝试获取一个 UIAlert，它会在用户发送短信时显示 "message sent"。这是我的。

- (void)messageComposeViewController:(MFMessageComposeViewController
                                      *)controller didFinishWithResult:(MessageComposeResult)result
{
    if (result == MessageComposeResultCancelled)
    {
    }
    else if (result == MessageComposeResultSent)
    {
        UIAlertController* messageSent = [UIAlertController alertControllerWithTitle:@"" message:@"Message Sent." preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction* okAction = [UIAlertAction actionWithTitle:@"OK"style:UIAlertActionStyleDefault
                                                         handler:NULL];
        [messageSent addAction:okAction];
        [self.presentViewController:messageSent animated:YES completion:nil];
    }
    else
        NSLog(@"Message failed");

        [self dismissViewControllerAnimated:YES completion:NULL];
}

当我运行应用程序发送消息时，没有出现 UIAlert。 Xcode 还说，警告：试图展示其视图不在 window 层次结构中！我哪里错了？

Answer 1

我没有使用过 MFMessageComposeViewController，但我认为您必须先关闭 MFMessageComposeViewController，然后在完成时显示警报，如下所示。尝试一下，让我知道是否可行，也许自己指的是 MFMessageComposeViewController？不确定！

else if (result == MessageComposeResultSent)
{
    [controller dismissViewControllerAnimated:true completion:^{
        UIAlertController* messageSent = [UIAlertController alertControllerWithTitle:@"" message:@"Message Sent." preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction* okAction = [UIAlertAction actionWithTitle:@"OK"style:UIAlertActionStyleDefault
                                                         handler:NULL];
        [messageSent addAction:okAction];
        [self presentViewController:messageSent animated:true completion:^{
            //try anything on completion
        }];
    }];
}

MessageComposeResult UIAlert 未显示

MessageComposeResult UIAlert Not showing

sms

objective-c

uialertview