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当手机处于 UIInterfaceOrientationPortrait 时，使用 MFMailComposeViewController 可以正常工作，但是如果我不允许自动旋转，当用户旋转手机时，我会得到类似的结果：

在此处输入图像描述

所以我决定允许视图控制器（也是模态视图），它是调用模态视图旋转的视图的一部分：

RootAppInfoViewController.h

#import <UIKit/UIKit.h>


@interface RootAppInfoViewController : UIViewController <UINavigationControllerDelegate>{
    UINavigationController *navigationControl;
}

@property (nonatomic,retain) IBOutlet UINavigationController *navigationControl;

//dismisses this modal view
- (IBAction)selectHome:(id)sender;

@end

RootAppInfoViewController.m

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

（顺便说一下，让这个自动旋转允许旋转整个视图）。但这只是一个视图控制器，我希望以模态方式呈现表视图，所以我有这个类，它通过 RootAppInfoViewController.xib 引用，这使得这个模态视图成为表视图：

AppInfoViewController.h

#import <UIKit/UIKit.h>
#import <MessageUI/MessageUI.h>


@interface AppInfoViewController : UITableViewController <MFMailComposeViewControllerDelegate, UINavigationControllerDelegate> {
    NSMutableArray *dataSourceArray;
}

@property(nonatomic, retain) NSMutableArray *dataSourceArray;

@end

AppInfoViewController.m

//..
/* //NOTE: Commenting or uncommenting this block of code has no effect!
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}//*/
//...
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    NSString *source = [[[self.dataSourceArray objectAtIndex:indexPath.section] objectForKey:kSourceKey] objectAtIndex:indexPath.row];

    if(indexPath.section == kFeedbackSection) {
        if([MFMailComposeViewController canSendMail]) {
            // fill out email
            //...
            MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
            //MailCompose *controller = [[MailCompose alloc] init];
            controller.mailComposeDelegate = self;
            [[controller navigationBar] setTintColor:[UIColor oceanColor]];
            [controller setToRecipients:[NSArray arrayWithObject:kFeedbackEmail]];
            [controller setSubject:emailSubject];
            [controller setMessageBody:emailBodyTemplate isHTML:NO];
            [self presentModalViewController:controller animated:YES];
            [controller release];
        } else {
            [UIAlertHelper mailErrorAlert];
        }
    } //... 

}

#pragma mark -
#pragma mark MFMailComposeViewControllerDelegate methods

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

注释或不注释掉此类中的自转代码无效。将设备直立并单击加载 MFMailComposeViewController 的行没有问题，它会直立加载，然后旋转就好了。但是，加载表格视图，将其侧向按住，然后使用 MFMailComposeViewController 在行上点击，将模式视图控制器加载为空白屏幕：

在此处输入图像描述

这发生在模拟器和实际的物理设备中。

有谁知道怎么回事？提前致谢！

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1 回答 1

0

为了充分解释答案，我必须首先详细说明我的模态视图是如何创建的。

以下是我的观点的概述：

RootViewController -> AppInfoViewController -> MFMailComposeViewController

我在我的 RootViewController 中有以下方法：

- (IBAction)openEmail:(id)sender {
    AppInfoViewController *aivc = [[AppInfoViewController alloc] initWithNibName:@"AppInfoViewController" bundle:nil];
    aivc.title = @"Email";
    [self presentModalViewController:aivc animated:YES];
    [aivc release];
 }

这会弹出一个模态视图控制器，显示一个表格视图，用户可以从中深入了解其他视图。这里的问题是我创建了模态控制器而没有将它首先呈现的视图放入导航控制器中，如下所示：

- (IBAction)openEmail:(id)sender {
    AppInfoViewController *aivc = [[AppInfoViewController alloc] initWithNibName:@"AppInfoViewController" bundle:nil];
    myNavigationController = [[UINavigationController alloc] initWithRootViewController:aivc];
    aivc.title = @"Email";
    [self presentModalViewController:myNavigationController animated:YES];
    [myNavigationController release];
    [aivc release];
}

将我的代码更改为上述代码后，一切正常。问题不在 AppInfoViewController 中。

于 2013-05-25T20:36:40.953 回答