Unbalanced calls to begin/end appearance transitions for <UINavigationController: 0x160015600>.
主视图和详细视图控制器都嵌入在UINavigationController中.但是,只有在设置以下内容时才会出现错误(这是iPhone上逻辑行为所必需的)：
class MySplitViewController: UISplitViewController,UISplitViewControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
}
func splitViewController(splitViewController: UISplitViewController,collapseSecondaryViewController secondaryViewController: UIViewController,ontoPrimaryViewController primaryViewController: UIViewController) -> Bool {
return true
}
}
如果有人能提供这个问题的解决方案,那将是很好的,在此先感谢.
BTW：拆分视图控制器已在故事板中设置
呈现详细视图控制器是在tableView：didSelectRowAtIndexPath：方法中完成的,如下所示：
if let detailViewController = delegate as? DetailViewController {
detailViewController.navigationItem.leftItemsSupplementBackButton = true
detailViewController.navigationItem.leftBarButtonItem = splitViewController!.displayModeButtonItem()
splitViewController!.showDetailViewController(detailViewController.navigationController!,sender: self)
}
解决方法
可能的原因是您可能尝试在主UIViewController的viewDidLoad()方法中呈现详细视图的第一个“实例”？在这种情况下,您应用可能会尝试在主视图完成显示之前显示详细信息视图.请注意,视图之间的区别确实加载了视图并且确实显示了视图：
override func viewDidLoad()
Description:
Called after the controller’s view is loaded into memory.
This method is called after the view controller has loaded its view
hierarchy into memory.
override func viewDidAppear(animated: Bool)
Description:
Notifies the view controller that its view was added to a view
hierarchy. You can override this method to perform additional tasks
associated with presenting the view.
现在,由于您的问题未显示如何加载初始详细信息视图,因此您可能已经注意到以下建议,但无论如何：如果您的详细视图是从viewDidLoad()呈现的,请尝试将其移至viewDidAppear( ) 方法：
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(true)
// present/load detail view here instead
}
