UIIMagePickerController在iPad ios 6.0上解散时崩溃

我有一个带有以下init的ViewController(MyPickerController)：

- (id)init
{
    self = [super init];
    if (self) {
        _picker = [[UIImagePickerController alloc] init];
        _picker.delegate = self;
        _picker.sourCEType = UIImagePickerControllersourceTypeCamera;
        [self.view addSubview:_picker.view];
    }
    return self;
}

我实现了以下UIPickerControllerDelegate方法来dimiss MyPickerController：

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissviewControllerAnimated:YES completion:nil];
}

好吧,我有另一个视图控制器在FormSheetStyle中显示模态,当我点击一个按钮时,我想用以下代码@L_333_6@myPickerController：

@H_869_9@myPickerController * pickerVC = [[MyPickerController alloc] init]; [self presentViewController:pickerVC animated:YES completion:nil];

在我的AppDelegate中我有以下方法：

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    
    return (NSUInteger)[application supportedInterfaceOrientationsForWindow:window] | (1<<UIInterfaceOrientationPorTrait);
    
}

当我点击UIIMagePicker的取消按钮进入MyPickerController时,应用程序崩溃并出现以下错误：

TerminaTing app due to uncaught exception 'UIApplicationInvalidInterfaceOrientation',reason: 'preferredInterfaceOrientationForPresentation must return a supported interface orientation!

阅读stackoverflow上的相关问题,我还创建了以下UIImagePickerController类：

@implementation UIImagePickerController (NonRotaTing)

- (BOOL)shouldAutorotate
{
    return NO;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationMaskPorTrait;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPorTrait;
}

@end

谢谢！