iphone - 即使我有一个 navigationController，pushViewController 也不起作用

Question

我有一个 UIViewController，里面有两个 UITableView。当我在第一个 UITableView 中选择一行时，它必须推送不会发生的相同 UIViewController。

在 UIViewController.hi 中有，

FirstTableViewController *firstController;
SecondTableViewController *secondController;

在 UIViewController.mi 中有，

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    if (firstController == nil) {
        firstController = [[FirstTableViewController alloc] init];
    }
    if (secondController == nil) {
        secondController = [[SecondTableViewController alloc] init];
    }
    UINavigationController *firstNavigationController = [[UINavigationController alloc] initWithRootViewController:firstController];
    firstController.product = self.product;
    [firstTable setDataSource:firstController];
    [firstTable setDelegate:firstController];
    firstNavigationController.view = firstController.tableView;
}

在 FirstTableViewController.m 中，我有 didSelectRowAtIndexPath，

[self.searchDisplayController setActive:YES animated:YES];
UIViewController *controller = [[UIViewController alloc]initWithNibName:@"UIViewController" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:controller];
navController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
controller.product = prod;
NSLog(@"Navigation controller is %@",self.navigationController); //not null
[[self navigationController]pushViewController:controller animated:YES];

请帮忙。

编辑#1：从 UtilityApp 的 FlipsideViewController 调用 UIViewController。

Answer 1

向您的 AppDelegate 添加一个属性UINavigationController *nav 在应用程序 didFinishLaunching 方法中将此行添加到 AppDelegate.m

navigationControl = [[UINavigationController alloc] initWithRootViewController:yourFirst ViewController];

转到 yourFirstViewController，添加一个UINavigationController *nav属性并将这些行添加到 viewDidLoad 方法

AppDelegate *app = [[UIApplication sharedApplication] delegate];
self.nav = app.nav;

使用此行推送任何 viewController

[self.nav pushViewController:controller animated:YES];

Answer 2

LoginViewSimpleController *loginViewSimple = [[LoginViewSimpleController alloc]init];

UINavigationController *navController = [[UINavigationController alloc]initWithRootViewController:loginViewSimple];

[self setNavigationController:navController];

Have you identify both tableviews ? Can you Post log status here ?

Answer 3

在“didSelectRowAtIndexPath”中使用此代码

UIViewController *controller = [[UIViewController alloc]initWithNibName:@"UIViewController" bundle:nil];


     [self.navigationController pushViewController:controller animated:YES];

     [viewController release];

Answer 4

如果你想以模态方式显示视图控制器，你应该使用presentViewController:animated:completion:and not pushViewController:animated:。

[self presentViewController:controller animated:YES completion:nil];