任何其他類中的UINavigationController

Question

嗨，我正在嘗試使UINavigationController而不是在mainViewController（first viewControllerClass）中，我需要將UINavigationController放在第二類中。 但是如果我要在appDelegate.m中編寫這些代碼

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];


        // Override point for customization after application launch.
    self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    self.window.rootViewController = self.viewController;
   // [window addSubview:[navigationController view]];


    UINavigationController *navigation = [[UINavigationController alloc]initWithRootViewController:self.viewController];
    self.window.rootViewController = navigation;

    [self.window makeKeyAndVisible];
    return YES;
}

然后，UINavigationController出現在mainView中。 我試圖把它放在這樣的其他班級

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

  //  strWhichTaleOnScreen=[masivTaleNames objectAtIndex:indexPath.row];
    NSString *selectDay;
    selectDay=@"first string";
    NSLog(@"selecDay=%@",selectDay);
       classDetailOfMessagesViewController *nesneDetailOfMessagesViewController = [[classDetailOfMessagesViewController alloc] initWithNibName:@"classDetailOfMessagesViewController" bundle:nil];
    nesneDetailOfMessagesViewController.selectDay = selectDay;
    [navigation pushViewController: nesneDetailOfMessagesViewController animated:YES];
    nesneDetailOfMessagesViewController = nil;





}

但這是行不通的，我想我必須在第二個視圖中創建rootViewController，但我不知道如何。 如果有人可以向我展示解決問題的方法，我會很高興。

Answer 1

我看到的第一個錯誤是您嘗試兩次設置窗口rootviewcontroller。 視圖層次結構需要類似於window-> navigation controller-> view controller。 因此我對您的代碼進行了一些更改。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];


        // Override point for customization after application launch.
    self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];

    UINavigationController *navigation = [[UINavigationController alloc]initWithRootViewController:self.viewController];
    self.window.rootViewController = navigation;

    [self.window makeKeyAndVisible];
    return YES;
}

在第二個代碼示例中，我找不到導航的引用。 並且如果您將一個視圖控制器（在本例中為initWithRootViewController）推入navigationcontroller堆棧，則可以通過self.navigationController訪問該導航控制器，因此代碼的第二部分應如下所示；

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    NSString *selectDay;
    selectDay=@"first string";
    NSLog(@"selecDay=%@",selectDay);
       classDetailOfMessagesViewController *nesneDetailOfMessagesViewController = [[classDetailOfMessagesViewController alloc] initWithNibName:@"classDetailOfMessagesViewController" bundle:nil];
    nesneDetailOfMessagesViewController.selectDay = selectDay;
    [self.navigationController pushViewController: nesneDetailOfMessagesViewController animated:YES];

}