iphone - pushViewController 不工作，即使我有一个 navigationController

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，它必须推送相同的 UIViewController，但这并没有发生。

在 UIViewController.h 我有，

FirstTableViewController *firstController;
SecondTableViewController *secondController;

在 UIViewController.m 我有，

- (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

将属性添加到您的 AppDelegate 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];

转到您的 FirstViewController，添加 UINavigationController *nav 属性并将这些行添加到 viewDidLoad 方法

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

使用这一行来推送任何viewController

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