如何更改navigationController的rootViewController

Question

在appDelegate中，我创建一个A_NavigationController成为self.window.rootViewController，并设置一个X_ViewController成为rootViewController，在推送其他viewController之后，我创建一个新的B_NavigationController，设置一个新的Y_ViewController成为rootViewController并使用presentModalViewController方法，添加了B_NavigationeController。现在我想做的是，当我解雇Y_ViewController时可以更改A_NavigationController的rootViewController。

     self.viewController = [[AViewController alloc] initWithNibName:@"AViewController" bundle:nil];
    self.navCon=[[UINavigationController alloc]initWithRootViewController:self.viewController];

    self.window.rootViewController = self.navCon;


  BViewController *bView=[[BViewController alloc]initWithNibName:@"BViewController" bundle:nil];
        UINavigationController *navCon=[[UINavigationController alloc]initWithRootViewController:bView];
        [self.navigationController presentModalViewController:navCon animated:YES];

//in BViewController.m
//I want a method to change the window's rootViewController.

Answer 1

“rootViewController”只是navigationStack底部的UIViewController。要更改它，您只需将索引0处的对象设置为您想要的任何控制器