相关疑难解决方法(0)

我正在显示一个MFMailComposeViewController,如下所示:

- (IBAction) contactUs: (id) sender {
    [Tracker trackContactUsPressed: [MFMailComposeViewController canSendMail]];

    if ([MFMailComposeViewController canSendMail] == NO) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Email Error"
                                                        message: @"Email has not been configured on this device.  Please send us an email at\nFOO@BAR.com"
                                                       delegate: self
                                              cancelButtonTitle: @"OK"
                                              otherButtonTitles: nil];
        [alert show];
        [alert release];
    } else {

        MFMailComposeViewController *controller = [[[MFMailComposeViewController alloc] init] autorelease];

        [controller setSubject:@"Comments about FOO"];            

        [controller setToRecipients: [NSArray arrayWithObject: @"FOO@BAR.com"]];
        [controller setMailComposeDelegate: self];

        [[self parentViewController] presentModalViewController:controller animated:YES];
    }
}

然后我的代表看起来像这样:

- …

下面的代码在iOS 4和5中运行良好,但在iOS 6中崩溃EXC_BAD_ACCESS.我很感激您在排除故障时提供帮助.在UITableViewController处理我的应用程序的搜索逻辑的过程中调用此代码:

CATransition *transition = [CATransition animation];
transition.duration = 0.3f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
transition.type = kCATransitionFade;

[self.navigationController.view.layer addAnimation:transition forKey:nil];
[self.navigationController popViewControllerAnimated:NO];

我添加的tableView方式类似,并且在调用时不会崩溃:

SearchTVC *searchTable = [[SearchTVC alloc] init];
searchTable.detailViewController = self.detailViewController;

CATransition *transition = [CATransition animation];
transition.duration = 0.3f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
transition.type = kCATransitionFade;

[self.navigationController.view.layer addAnimation:transition forKey:nil];
[self.navigationController pushViewController:searchTable animated:NO];

可能是什么问题呢？

*编辑

有趣的是,如果我使用[self.navigationController popViewControllerAnimated:YES];(YES而不是NO),则不会发生崩溃.但当然这会破坏使用自定义流行动画的目的.