如何将值传递给嵌入在 NavigationController 中的 viewController

Question

There are similar questions but they are either in swift or are not solving my problem.
I've a view controller which is presenting navigation view controller when cell did select button is pressed as:

patientBillNavigationViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PatientBillVC"];
//soem value assignment
[self presentViewController:viewController animated:YES completion:nil];

You can say billing opens up a whole new view independent of the main app flow to handle billing process.
The view this navigation View Controller automatically loads is the bill view and now if I want to pass a value from this viewcontroller to the other viewController embedded in navigation view I can't do that. How to pass a value?

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
            PatientBillViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"PBVC"];

            vc.superBillToAddEdit = sb;
//then display the view embedded in navigation view

But this is not working.

Answer 1

One way I know is to Subclass UINavigationViewController and in its viewDidLoad , you can do:

 YourEmbeddedVc *svc =self.viewControllers[0]; //get the controller reference
 svc.name= @"Hello";

I'm assuming you are only having one controller in your navigation stack, if not you need to find out the proper match of the required VC.

Answer 2

I might not be understanding the question exactly, correct me if I'm wrong.

It sounds like you want to start a nav controller from a view controller (let's call this firstViewController ) and pass a value from firstViewController to the view controller that will eventually load in the nav controller.

If that's the case, why don't you create the second view controller ( billingStep1ViewController ) and then assign the value to it as a property, then pass the billingStep1ViewController to the nav controller's initWithRootViewController: method?

Something like this (untested code, btw):

 
 
 
 
  
  
  // this code would go inside our FirstViewController file // create the first vc that will be loaded in the nav controller BillingStep1ViewController *billingStepOneVc = [self.storyboard instantiateViewControllerWithIdentifier:@"stepOne"]; // set the value you want billingStepOneVc.bill = myBill; // create new nav controller with step one vc as the root UINavigationController *uiNavController = [[UINavigationController alloc] initWithRootViewController:billingStepOneVc]; [self presentViewController:uiNavController];
 
 
 

That way you can have two view controllers talking directly with one another and not worry about the navigation controller at all.

Update : Here is some tested code that works to illustrate my idea:

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
//create the step 1 view controller - this is the first view controller we will see in the navigation controller
StepOneViewController *stepOneVc = [storyboard instantiateViewControllerWithIdentifier:@"stepOne"];
//assign a value to it (name is an NSString @property of StepOneViewController)
stepOneVc.name = @"Jones";

//this is the nav controller we will display, we set the root vc to our step one.
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:stepOneVc];

//present the nav controller on screen.
[self presentViewController:navController animated:YES completion:nil];

Some of the class names changed but the idea is the same.

Answer 3

Rather than creating the navigation controller from its storyboard identifier, create it programmatically, with the PatientBillViewController you created as its root view controller. Like this:

UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

PatientBillViewController *pbVC = [mainStoryboard instantiateViewControllerWithIdentifier:@"PBVC"];
pbVC.superBillToAddEdit = sb;

PatientBillNavigationViewController * navVC = [[PatientBillNavigationViewController alloc] initWithRootViewController:pbVC];

[self presentViewController:navVC animated:true completion:nil];

Answer 4

Swift Version

Here is the swift version answer for the above problem!!

   let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "PatientBillVC") as! patientBillNavigationViewController
   vc.name = "name"
   let mVc = UINavigationController.init(rootViewController: vc)
       self.navigationController?.present(mVc, animated: true, completion: nil)