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我在更新我的一个旧应用程序时遇到问题，这只是因为我更新到 Xcode 4.5 并在 iOS6 上尝试它给出了以下错误；

*** Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'A view can only be associated with at most one view controller at a time! View <MainView: 0x1e818620; frame = (0 0; 320 476); autoresize = RM+BM; layer = <CALayer: 0x1e818750>> is associated with <MainViewController: 0x1e811850>. Clear this association before associating this view with <UIViewController: 0x21149860>.'

*第一掷调用堆栈：（0x377d82a3 0x35ae897f 0x377d81c5 0x38b0dd7b 0x38b0dc6b 0x1dc25 0x38b940ad 0x38b9405f 0x38b9403d 0x38b938f3 0x38b93de9 0x38abc5f9 0x38aa9809 0x38aa9123 0x37c5c5a3 0x37c5c1d3 0x377ad173 0x377ad117 0x377abf99 0x3771eebd 0x3771ed49 0x37c5b2eb 0x38afd301 0x1bf03 0x1bea8）的libc ++ abi.dylib：终止叫做抛出异常[切换处理9219线程0x2403]

我认为这是导致问题的原因；

 mailComposer = [[UIViewController alloc] init];
[mailComposer setView:self];
[mailComposer setModalTransitionStyle: UIModalTransitionStyleCoverVertical];




MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];   picker.mailComposeDelegate = self;

就像当我单击应该将我带到 MFMail 作曲家的按钮时，应用程序崩溃时一样。

有任何想法吗？

提前致谢

编辑 - 如果我删除前 3 行，应用程序不会崩溃，但是邮件视图不会加载......这是整个代码；

    // The actual mail window call



mailComposer = [[UIViewController alloc] init];
[mailComposer setView:self];
[mailComposer setModalTransitionStyle: UIModalTransitionStyleCoverVertical];




MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];   picker.mailComposeDelegate = self;

[picker setSubject:@"Hello How are you"];

    // Fill out the email body text
NSString *pageLink = @"http://www.apple.com"; 
NSString *iTunesLink = @"http://itunes.apple.com/gb/artist/randomer";
NSString *content = @"blah blah"; 


NSString *emailFileName = [NSString stringWithFormat:@"email_.html"];


NSString *emailFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: emailFileName];
NSString *body = [NSString stringWithContentsOfFile:emailFilePath encoding:NSUTF8StringEncoding error:nil];


body = [body stringByReplacingOccurrencesOfString:@"//TEXT_PLACEHOLDER//" withString:@"replace here"];
body = [body stringByReplacingOccurrencesOfString:@"//FRIENDNAME_PLACEHOLDER//" withString:pageLink];
body = [body stringByReplacingOccurrencesOfString:@"//ITUNES_PLACEHOLDER//" withString:  iTunesLink];
body = [body stringByReplacingOccurrencesOfString:@"//PASSKEY_PLACEHOLDER//" withString:  yourPassword];
body = [body stringByReplacingOccurrencesOfString:@"//PHONETIC_PLACEHOLDER//" withString:  yourPhoneticPassword];




[picker setMessageBody:body isHTML:YES];    
picker.navigationBar.barStyle = UIBarStyleBlack;    
[mailComposer presentModalViewController:picker animated:YES];
[picker release];

}

//HANDLE THE MAIL EVENTS
////////////////////////

  • (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error { // 通知用户与界面开关相关的错误 (result) { case MFMailComposeResultCancelled: break; case MFMailComposeResultSaved: break; case MFMailComposeResultSent: break; 案例 MFMailComposeResultFailed: 中断；

    default:
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Email" message:@"Sending Failed - Unknown Error :-("
                                                   delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
    [alert show];
    [alert release];
}

    break;

    } [mailComposerdismissModalViewControllerAnimated:YES]; //[mailComposer.view.superview removeFromSuperview]; }

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1 回答 1

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让邮件撰写视图控制器显示的主要内容是使用当前活动的 UIViewController 来显示它。您没有共享足够的代码以使我清楚这一点，但是如果self在该上下文中是 UIViewController ，则您需要执行以下操作：

[self presentViewController:picker animated: YES completion:nil];

如果self不是 UIViewController，self则在上面的代码中替换为引用当前 UIViewController 的变量。

于 2012-11-04T12:14:41.930 回答