Question

I have a tab bar controller with two tabs:

• tabBar1View with a button named “openDifferentView” and a textfield
  “myvalue” with text “test”
• tabBar2View with a textfield named
  “txtInTab2”

When I tap on openDifferentView i want tabBar2View to show, and pass the value “test” (from tabBar1View.myvalue.text) to txtInTab2 (in tabBar2View).

I get the view to show up using [self.tabBarController setSelectedIndex:1] but I’m unsure how I can set the value of its textfield, from this view.

I thought this would be possible:

UIViewController *tab2;
tab2 = [self.tabBarController.viewControllers objectAtIndex:1];
tab2.txtInTab2.text = "something"; //doesn't work
tab2.show; //don't know how to this

Edit: I have already added IBOutlet @property/@synthesize for the textfield in tabBar2View, and #import “tabBar2View.h” in tabBar1View.

Answer 1

UIViewController doesn’t have a property called txtInTab2. txtInTab2 is a property you’ve added to your own UIViewController subclass (which you’ve called TabBar2View).

The code is basically right, but you need to define tab2 as being whatever type of view controller it actually is. From your comments below, it’s actually a navigation controller, so you’ll need to do this:

#import "MyViewController.h"

UInavigationController *tab2;
tab2 = [self.tabBarController.viewControllers objectAtIndex:1];

//now lets get the frontmost view controller in the navigation controller
//which will (hopefully) be your custom view controller class
TabBar2View *viewController = (TabBar2View *)tab2.topViewController;

//now before we set the label, we need to make sure that the
//view controller's view has actually been loaded from its nib
//file. calling its view property forces it to load
[viewController view];

//now we can set the label
viewController.txtInTab2.text = @"something"; //this will work now

Then to actually show it, you need to do this via the tab bar controller, like this:

[self.tabBarController setSelectedIndex:1]; //show the second tab