无法在iOS7中显示模态ViewController [英] Cannot show modal ViewController in iOS7

问题描述

我试图将系统定义的viewcontrollers（MFMailComposeViewController，TWTweetComposeViewController等）显示为模态视图。

I tried to show system defined viewcontrollers (MFMailComposeViewController, TWTweetComposeViewController,etc..) as a modal view.

但是这些viewcontrollers不会出现在iOS 7中（这些在iOS5，iOS6中运行。

But these viewcontrollers dosn't appear in iOS 7(these run in iOS5,iOS6).

由我创建的Viewcontrollers出现在iOS7（ex.HogeViewController）中。

Viewcontrollers created by me appear in iOS7(ex.HogeViewController).

我不打电话给 presentViewController：animated：completion at viewDidLoad 或 viewWillAppear 。

I don't call presentViewController:animated:completion at viewDidLoad or viewWillAppear.

有人知道吗？

控制台日志：

init错误域= NSCocoaErrorDomain代码= 4097操作无法完成。（可可错误4097。）

init Error Domain=NSCocoaErrorDomain Code=4097 "The operation couldn’t be completed. (Cocoa error 4097.)"

或

_serviceViewControllerReady：error：Error Domain = NSCocoaErrorDomain Code = 4097操作无法完成。（Cocoa error 4097。）

_serviceViewControllerReady:error: Error Domain=NSCocoaErrorDomain Code=4097 "The operation couldn’t be completed. (Cocoa error 4097.)"

或

对开始/结束外观转换的不平衡调用。

Unbalanced calls to begin/end appearance transitions for .

TWTweetComposeViewController（不显示）

TWTweetComposeViewController(doesn't appear)

TWTweetComposeViewController *viewController = [[TWTweetComposeViewController alloc]init];
viewController.completionHandler = ^(TWTweetComposeViewControllerResult result){
    NSLog(@"Result : %d",result);
};
[self presentViewController:viewController animated:YES completion:NULL];

日志

结果：0

Result : 0

MFMailComposeViewController（出现片刻并很快解散）

MFMailComposeViewController(appears a moment and dismiss soon)

- (void)send:(NSString*)email{
    if ([MFMailComposeViewController canSendMail]) {
        MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
        picker.mailComposeDelegate = self;

        NSArray *toRecipients = @[email];
        [picker setToRecipients:toRecipients];

        [picker setSubject:@"Subject"];
        [picker setMessageBody:@"Body" isHTML:NO];
        [self.navigationController presentViewController:picker animated:YES completion:NULL];
    }
}

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error {
    [self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"error:%@,result:%d",error.description,result);
    }];
}

日志

_serviceViewControllerReady：error：Error Domain = NSCocoaErrorDomain Code = 4097操作无法完成。（Cocoa error 4097.）
非平衡调用开始/结束外观转换。
错误：（null），结果：0

_serviceViewControllerReady:error: Error Domain=NSCocoaErrorDomain Code=4097 "The operation couldn’t be completed. (Cocoa error 4097.)" Unbalanced calls to begin/end appearance transitions for . error:(null),result:0

推荐答案

原来问题仅在自定义UIBarButtons时显示。如果我们在iPhone 5s上运行的32位应用程序中使用以下内容，则会遇到以下问题：

Turns out the issue only shows up when customizing UIBarButtons. If we use the following in our 32-bit app running on iPhone 5s, we have the problem:

[[UIBarButtonItem appearance] setTitlePositionAdjustment:UIOffsetMake(0, 1.0)
                                           forBarMetrics:UIBarMetricsDefault];

退出该行解决问题。我们已经提交了一份雷达。

Leaving out that line works around the problem. We have filed a radar.

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