Question

我正在努力查看视图层次结构，但我无法弄清楚这里出了什么问题。我尝试发送消息（MFMessageComposeViewController）。我希望在委托方法的帮助下，根据成功（或不成功）显示alertView。消息被取消时会显示alertView，但是在发送消息时我收到此错误：

Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior (<UIAlertController: 0x153b3c00>)

看起来好像在MFMessageComposeView被完全解除（或解除分配）消息发送之前调用了完成块（就好像后面还有一些东西在运行），但是当它是取消。如果它可以帮助：

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

    int tag;

    switch (result) {
        case MessageComposeResultCancelled:
        {
            tag = 1;
            NSLog(@"Cancelled");
            break;
        }
        case MessageComposeResultFailed:
        {
            tag = 2;
            NSLog(@"Failed");
            break;
        }

        case MessageComposeResultSent:
        {
            tag = 3;
            NSLog(@"Sent");
            break;
        }
        default:
            break;
    }
    [controller dismissViewControllerAnimated:YES completion:^{
        [self alertSMSMessageWithTag:tag];
    }];
}

- (void)alertSMSMessageWithTag:(int)tag {

    UIAlertController *alertController;

    if (tag == 1) { // cancelled
        alertController = [UIAlertController alertControllerWithTitle:@"Message cancelled" message:nil preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
        [alertController addAction:ok];
    }
    if (tag == 2) { // Failed
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Message failed" message:nil preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
        [alertController addAction:ok];
    }
    if (tag == 3) { // sent
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Message sent" message:nil preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
        [alertController addAction:ok];
    }
    [self presentViewController:alertController animated:YES completion:nil];
}

如果有人能帮助我......

Answer 1

您没有以适当的方式初始化<?php include("includes/connect.php"); if(isset($_GET['id'])){ $get_id = $_GET['id']; $get_query = "select * from posts where post_id='$get_id'"; $run_query = mysql_query($get_query); while ($row=mysql_fetch_array($run_query)){ $post_id = $row['post_id']; $post_title = $row['post_title']; $post_image = $row['post_image']; } } ?>` <div> <h2> <?php echo $post_title;?> </h2> </div>。您正在使用相同的变量名alertController，它是公共的

UIAlertController

但不公开该方法。并且您正在使用对方法if (tag == 3) { }公开的相同变量名称 UIAlertController *alertController;正在访问公共方法变量，即[self presentViewController:alertController animated:YES completion:nil];，您已为标记1正确初始化。我建议您使用以下代码 -

UIAlertController *alertController;

希望它有所帮助。

在解除MFMessageController时显示AlertView时出错

1 个答案: