Question

在我的appDelegate中，我将ClassA设置为导航控制器的根视图，如下所示

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
  self.window       =   [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
  ClassA    *classA =   [[ClassA alloc] initWithNibName:@"ClassA" bundle:nil];

  self.navigationController  =   [[UINavigationController alloc] classA];
  [self.window makeKeyAndVisible];
  return YES;
}

然后在classA，我正在做

- (void)myMethod {
  NSMutableArray *navigationArray1 = [[NSMutableArray alloc]initWithArray:self.navigationController.viewControllers];    

  NSLog(@"before using setViewControlles---->navigationarray.viewControllers is %d",[navigationArray1 count]);

  ClassB     *classB     =   [[ClassB alloc] initWithNibName:@"ClassB" bundle:nil];
  [self.navigationController setViewControllers:[NSArray arrayWithObject:classB] animated:YES]; 

  NSMutableArray *navigationarray2 = [[NSMutableArray alloc]initWithArray:self.navigationController.viewControllers];
  NSLog(@"after using setViewControllers---->navigationController.viewControllers is %d",[navigationarray2 count]);

}

在调试模式下，我正在

before using setViewControlles---->navigationarray.viewControllers is 1
after  using setViewControlles---->navigationarray.viewControllers is 0

我认为使用setViewControllers

后结果应为1

我现在迷路了，需要你们的一些建议。如果您对此问题有任何想法，请提供帮助。感谢

Answer 1

self.window.rootViewController = classA

我改变了答案。 self.navigationController.rootViewController错误

在setViewControllers之后，navigationController.viewControllers为0

1 个答案: