Question

我之前见过几个问题，例如this，但由于缺乏一个已接受的答案以及根据需要实施了所有问题，我仍然继续面对如下问题：我显示邮件编辑器，但点击取消时，作曲家视图冻结。我认为这是由于保存/删除草稿操作表显示在可见框架之外。是的我已将mailComposeDelegate设置为呈现视图控制器，并已阅读几个类似的问题，其中用户未处理(void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error委托以取消取消作曲家。我也处理了这个问题，但我似乎无法弄清楚为什么动作表不会出现在我的通用应用程序的iPhone版本的屏幕的可见区域中。以模块方式将邮件编辑器呈现为NSLogged的视图控制器的视图框架是（0,0,320,480）。我的应用程序是通用的＆amp;邮件作曲家在iPad上完美运行。以下是在iPhone模拟器5.1上运行的作曲家视图外观的截图： -
enter image description here
这是显示作曲家的代码：

-(IBAction)mailButtonPressed:(id)sender {

    MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
    controller.mailComposeDelegate = self;
    [controller setSubject:@"Subject"];
    [controller setMessageBody:@"Test" isHTML:YES];
    [controller setToRecipients:nil];

    if(controller) {
        [self presentModalViewController:controller animated:YES];
        [controller release];
    }
}

- (void)mailComposeController:(MFMailComposeViewController*)controller 
          didFinishWithResult:(MFMailComposeResult)result
                        error:(NSError*)error 
{ 
    [self dismissModalViewControllerAnimated:YES];
}

Answer 1

为什么不尝试删除代码，并在线上教程时重试，例如：

http://iphonedevsdk.com/forum/tutorial-discussion/43633-quick-tutorial-on-how-to-add-mfmailcomposeviewcontroller.html

在这些情况下，你总是忘记了工作所需的一行简单代码，因此遵循教程可以帮助我确保所有必要的代码都在那里。

请尝试使用此代码：

- (void) mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    switch (result)
    {
        case MFMailComposeResultCancelled:
            NSLog(@"Mail cancelled");
            break;
        case MFMailComposeResultSaved:
            NSLog(@"Mail saved");
            break;
        case MFMailComposeResultSent:
            NSLog(@"Mail sent");
            break;
        case MFMailComposeResultFailed:
            NSLog(@"Mail sent failure: %@", [error localizedDescription]);
            break;
        default:
            break;
    }

    // Close the Mail Interface
    [self dismissViewControllerAnimated:YES completion:NULL];
}

Answer 2

在此处使用此完整代码作为消息：

·H

    #import <MessageUI/MFMailComposeViewController.h>
    @interface EmailViewController : UIViewController<MFMailComposeViewControllerDelegate>

的.m

  -(IBAction)Email {

        MFMailComposeViewController *composer = [[MFMailComposeViewController alloc] init];
            [composer setMailComposeDelegate:self];
            if ([MFMailComposeViewController canSendMail]) {
                [composer setToRecipients:[NSArray arrayWithObjects:@"contact_aaron@easy.com", nil]];
                [composer setSubject:@"Idea for Basic Calculator"];
                [composer setMessageBody:@"My idea is:" isHTML:NO];
                [composer setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
                [self presentModalViewController:composer animated:YES];

    }

-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    if (error) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error with message" message:[NSString stringWithFormat:@"Error %@", [error description]] delegate:nil cancelButtonTitle:@"Try Again Later!" otherButtonTitles:nil, nil];
        [alert show];
        [self dismissModalViewControllerAnimated:YES];
    }
    else {
        [self dismissModalViewControllerAnimated:YES];
    }
}

Answer 3

您尝试的设备可能由于某种原因无法发送邮件

您可以使用[MFMailComposeViewController canSendMail]

进行检查

Answer 4

在

中应用此功能

-(void)displayComposerSheet

if(composer != nil) {

    [composer release];

    composer = nil;

}

为此对象赋值后

[picker composer];

Answer 5

您似乎没有使用自动参考计数（ARC）。您过早发布邮件撰写控制器。在被解雇后释放它。

删除此行：[控制器发布]

if(controller) {
    [self presentModalViewController:controller animated:YES];
    /// remove this: ---->  [controller release];
}

并在此处发布此控制器

- (void)mailComposeController:(MFMailComposeViewController*)controller 
          didFinishWithResult:(MFMailComposeResult)result
                        error:(NSError*)error 
{ 
    [self dismissModalViewControllerAnimated:YES];

    [controller release]; // <----     add this
}

Answer 6

将此添加到您的（所有）UIViewControllers以检查您的iPhone是否耗尽或内存。这可以解释奇怪的行为，即mailComposerSheet发布了你的基本viewController，所以mailComposerDelegate是零。

- (void)didReceiveMemoryWarning
{
  NSLog(@"didReceiveMemoryWarning");
  [super didReceiveMemoryWarning];
}

MFMailComposeViewController的取消按钮（可能是操作表）冻结视图

6 个答案: