从ViewController导航到RootViewController，主导航选项卡保持不变

Question

这很好用：

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let innerPage: subVC = mainStoryboard.instantiateViewController(withIdentifier: "subSB") as! subVC
self.present(innerPage, animated: true, completion: nil)

这也不起作用：

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let innerPage: subVC = mainStoryboard.instantiateViewController(withIdentifier: "subSB") as! subVC
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = innerPage

除了它删除MainNavigation视图。它只显示特定视图，但没有MainNav。我认为这是因为我没有从我调用代码的ViewController进入根视图控制器？

这是它的配置方式：

但是如何实现呢？

Answer 1

您正在做的是用subVC替换根视图控制器。如果你想保留mainNavigationVC并且只想更改它的＆＃39; root到subVC，执行如下操作

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let innerPage: subVC = mainStoryboard.instantiateViewController(withIdentifier: "subSB") as! subVC
let mainNav: mainNavigationVC = mainNavigationVC(rootViewController: innerPage)

let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = mainNav