Ios – Segue to a UINavigation Controller programmatically without storyboards

iosios6uinavigationcontrolleruiviewcontroller

I have code that uses Storyboards for seques, like so:

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"ShowDiagnosis"])
    {
        [segue.destinationViewController setHappiness:self.diagnosis];
    }
    ...

But I want to do it programmatically. I have myViewController class and when I click on a button I want to animate and push to myUINavigationController.

How is this done programmatically?

Best Answer

First things first, a segue cannot be created programmatically. It is created by the storyboard runtime when it is time to perform. However you may trigger a segue, which is already defined in the interface builder, by calling performSegueWithIdentifier:.

Other than this, you can provide transitions between view controllers without segue objects, for sure. In the corresponding action method, create your view controller instance, either by allocating programmatically or instantiating from storyboard with its identifier. Then, push it to your navigation controller.

- (void)buttonClicked:(UIButton *)sender
{
    MyViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"my-vc-identifier"];
    // OR MyViewController *vc = [[MyViewController alloc] init];

    // any setup code for *vc

    [self.navigationController pushViewController:vc animated:YES];
}

Related Solutions

Ios – Perform Segue programmatically and pass parameters to the destination view

The answer is simply that it makes no difference how the segue is triggered.

The prepareForSegue:sender: method is called in any case and this is where you pass your parameters across.

Ios – Programmatically set the initial view controller using Storyboards

How to without a dummy initial view controller

Ensure all initial view controllers have a Storyboard ID.

In the storyboard, uncheck the "Is initial View Controller" attribute from the first view controller.

If you run your app at this point you'll read:

Failed to instantiate the default view controller for UIMainStoryboardFile 'MainStoryboard' - perhaps the designated entry point is not set?

And you'll notice that your window property in the app delegate is now nil.

In the app's setting, go to your target and the Info tab. There clear the value of Main storyboard file base name. On the General tab, clear the value for Main Interface. This will remove the warning.

Create the window and desired initial view controller in the app delegate's application:didFinishLaunchingWithOptions: method:

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

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

    UIViewController *viewController = // determine the initial view controller here and instantiate it with [storyboard instantiateViewControllerWithIdentifier:<storyboard id>];

    self.window.rootViewController = viewController;
    [self.window makeKeyAndVisible];

    return YES;
}

Best Answer

Related Solutions

Ios – Perform Segue programmatically and pass parameters to the destination view

Ios – Programmatically set the initial view controller using Storyboards

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