Question

This is the main view and I’d like to toggle two separated views; for ON state and for OFF state.

How the code would look like?

Answer 1

Do the following

  - (void)viewDidLoad //of mainViewController {
        //do viewController1 alloc init     // Gray Color
        [self.view addSubview:viewController1.view];

        //do viewController2 alloc init     //Red Color
        [self.view addSubview:viewController2.view];

        [viewController2.view setHidden:YES];
    }

---

//assign this method to segmented controls' valueChanged event
    - (IBAction)segmentControlClicked:(id)sender {
        UISegmentedControl *segmentedControl = (UISegmentedControl *)sender; // if segmented control is not declared as an IBOutlet
        if (segmentedControl.selectedSegmentIndex == 0) {
            [viewController1.view setHidden:NO];
            [viewController2.view setHidden:YES];
        }
        else if (segmentedControl.selectedSegmentIndex == 1) {
            [viewController2.view setHidden:NO];
            [viewController1.view setHidden:YES];
        }
    }

Make sure that the ‘y’ origin viewController1 and viewController2 are below the Segmented Control so that the segmented control is not hidden.