当我尝试呈现视图时收到此警告 "attempt to present ViewController whose view is not in the window hierarchy"

Question

我的视图层次结构如下图所示：

我的问题是我想在单击 VC3 上的任何按钮时显示 VC1。这是我的代码

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("registerNavigation")
self.presentViewController(vc, animated: false, completion: nil)

但我收到此警告 "Warning: attempt to present ViewController whose view is not in the window hierarchy" 但没有任何反应。请告诉我，我做错了什么？

Answer 1

您正在向 navigationController 呈现，因此请使用如下代码。

let VC1 = self.storyboard!.instantiateViewControllerWithIdentifier("registerNavigation") as! ViewController
let navController = UINavigationController(rootViewController: VC1)
self.presentViewController(navController, animated:true, completion: nil)

Answer 2

如果您想从 VC3 显示 VC1，则不需要再次显示它，因为它已经加载到导航堆栈中。您只需要 dismiss or pop 导航堆栈中的 VC3 和 VC2。如果你展示了它然后关闭，如果你推了它然后弹出它。

您的警告的含义：您正在尝试呈现导航控制器 1 的视图层次结构中但不在导航控制器 2 的视图层次结构中的内容。！！

希望这会有所帮助:)

当我尝试呈现视图时收到此警告 "attempt to present ViewController whose view is not in the window hierarchy"

I got this warning "attempt to present ViewController whose view is not in the window hierarchy" when I try to present a view

warnings

modalviewcontroller

ios

swift