ios - UIViewControllerHierarchy不一致

Question

我正在尝试构建我的应用程序，有一次我推送了一个 UIViewController，然后我收到了这个错误。我不确定为什么。

'UIViewControllerHierarchyInconsistency', reason: 'A view can only be associated with at most one view controller at a time! View > is associated with . Clear this association before associating this view with .'

PageViewController *viewController;

viewController = [[PageViewController alloc] initWithManagedObjectContext:managedObjectContext];
dataSource = [[PagesDataSource alloc] initWithManagedObjectContext:managedObjectContext];

PVPage *selectedPage = [[dataSource pages] objectAtIndex:itemIndex];
[viewController setRepresentedPage:selectedPage];

PageFlipperAppDelegate *appDelegate = (PageFlipperAppDelegate *)[[UIApplication sharedApplication] delegate];
[(UINavigationController *)[[appDelegate window] rootViewController] setToolbarHidden:YES animated:YES];
[(UINavigationController *)[[appDelegate window] rootViewController] pushViewController:viewController animated:YES];

在我的 pageViewController 中 .....................

- (id)initWithManagedObjectContext:(NSManagedObjectContext *)initManagedObjectContext
{
    if ((self = [super initWithNibName:@"PageView" bundle:nil]))
    {
        [self setManagedObjectContext:initManagedObjectContext];
        dataSource = [[PagesDataSource alloc] initWithManagedObjectContext:[self managedObjectContext]];
    }
    return self;
}

Answer 1

陷阱场景:如果在同一个 .XIB 文件中有两个 UIViewController，并且 View 导出指向同一个 View ，则在加载 nib 时将引发 UIViewControllerHierarchyInconsistency 异常，例如通过调用其中一个的 .view 属性 View Controller 。