pushviewcontroller doesn't work?

Question

There is a button at the viewcontroller and when i click the button pushviewcontroller doesn't work.

my appdelegate.m file :

- (BOOL)applicationUIApplication *)application **didFinishLaunchingWithOptionsNSDictionary** *)launchOptions 
{
    self.window = [[UIWindow alloc] initWithFrame:EK_SCREEN_BOUNDS];

    ExampleViewController *exampleViewController = [ExampleViewController new];

    self.window.rootViewController = exampleViewController;

   [self.window makeKeyAndVisible];

   return YES;
}

Button click method (in ExampleViewController):

mainViewController *frm = [mainViewController new];
[self.navigationController pushViewController:frm animated:YES];

How i can fire button click event ?

its hard to read what you actually need, please use the formatting tools and rephrase your question — bunbun
– bunbun, Commented Jun 23, 2015 at 6:15

Kumar · Accepted Answer · 2015-06-23 06:18:03Z

1

Update your AppDelegate.m file with following code

self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
ExampleViewController *exampleViewController = [ExampleViewController new];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:exampleViewController];
self.window.rootViewController = navController;
//self.window.backgroundColor = [UIColor lightGrayColor];
[self.window makeKeyAndVisible];

The problem is that you are not initializing rootViewController from navigation controller. So, when you push a view controller on navigation controller it doesn't work. Because you never initialize a navigation controller.

answered Jun 23, 2015 at 6:18

Kumar

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6 Comments

melih keskin Over a year ago

okey thank you for reply. i do what you say then i click the button openning page is whole black. its not my viewcontroller. what is your opinion

Kumar Over a year ago

what is in your mainViewContorller? and also use coding convention like instead of mainViewContorller use file name as MainViewController

melih keskin Over a year ago

there is any code in my viewcontroller i just only i see my storyboard

Kumar Over a year ago

can you share screenshot of storyboard or code inside your myviewcontroller?

melih keskin Over a year ago

-(void)viewDidLoad{ [super viewDidLoad]; nslog(@"its done"); } thats all :)

|

Tejas Ardeshna · Accepted Answer · 2015-06-23 06:19:29Z

0

you need to change in appDelegate.m, need to set navigation controller as root view.

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

self.window = [[UIWindow alloc] initWithFrame:EK_SCREEN_BOUNDS];

ExampleViewController *exampleViewController = [ExampleViewController new];
UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController:exampleViewController];
self.window.rootViewController = navigation;

[self.window makeKeyAndVisible];

return YES;
}

answered Jun 23, 2015 at 6:19

Tejas Ardeshna

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Comments

Shekhar Gupta · Accepted Answer · 2015-06-23 06:21:42Z

0

You need to first add your ExampleViewController to UINavigationController as below

ExampleViewController *exampleViewController = [ExampleViewController new];

UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:exampleViewController];

self.window.rootViewController = exampleViewController;

After this you can do

mainViewController *frm = [mainViewController new]; [self.navigationController pushViewController:frm animated:YES];

answered Jun 23, 2015 at 6:21

Shekhar Gupta

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1 Comment

melih keskin Over a year ago

i added navigationcontroller in my appdelegate file then when i click the button works but openning the viewcontroller is not my viewcontroller.Because its whole black.

travdu · Accepted Answer · 2018-06-01 08:50:56Z

Swift version of what Latit mentioend:

class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -&gt; Bool {

        let screenBounds:CGRect = UIScreen.mainScreen().bounds

        var viewController:UIViewController = ViewController();

        self.window = UIWindow(frame: screenBounds);
        var nav:UINavigationController = UINavigationController(rootViewController: viewController);

        self.window?.rootViewController = nav;
        self.window?.makeKeyAndVisible();
       return true
    }
}

more info: http://www.ryanwright.me/cookbook/swift/ui-library/uinavigationcontrolle/set-root-controller

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