Question

employeeDetailed  = [[[EmployeeDetailedViewController alloc] initWithNibName:@"EmployeeDetailedViewController" bundle:nil] autorelease];
    UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:employeeDetailed] autorelease];
    [employeeDetailed release];
    [self.navigationController pushViewController:navController animated:YES];

我试着这说不好访问。[崩溃]

如何解决此问题。

@提前感谢

Answer 1

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    // Override point for customization after application launch.
    // Set the view controller as the window's root view controller and display.
    UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:self.viewController] autorelease];
    self.window.rootViewController = navController;
    [self.window makeKeyAndVisible];

    return YES;
}



employeeDetailed  = [[[EmployeeDetailedViewController alloc] initWithNibName:@"EmployeeDetailedViewController" bundle:nil] autorelease];

[self. navigationController presentModalViewController: navController];

这对你来说很有用。

Answer 2

您在第一行（alloc / init）中设置了autorelease

然后，您将在第三行显式释放视图控制器。

因此，您过度释放此对象并导致崩溃。

您可以删除 [employeeDetailed release] 一行，就可以了。

Answer 3

您无法将UINavigationController添加到现有导航堆栈。而不需要像这样显示新的导航控制器模式：

employeeDetailed  = [[[EmployeeDetailedViewController alloc] initWithNibName:@"EmployeeDetailedViewController" bundle:nil] autorelease];
UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:employeeDetailed] autorelease];
[self presentModalViewController: navController];

Answer 4

我发现在应用程序的特定部分中呈现导航控制器的最佳方式如下：

MyViewController *myViewController = [[MyViewController alloc]initwithnibname :@"MyViewController"];
    UINavigationController *myNavC = [[UINavigationController alloc]initWithRootViewController:myViewController];

然后在你的myViewController.m中使用

[self.NavigationController pushViewController: XController animated:YES];

如何将navigationcontroller添加到uiviewcontroller

4 个答案: