Switch the sub viewController use segmented control - ios

Question

I want switch the sub view controller from the segment control.
There is vc1 and vc2 in the storyboard, and there is segment control on the main vc's navigation controller bar.
I want to add the vc1 and vc2 on the main vc, how to switch the sub vc use the segment controller?
How to do with that?

Answer 1

Follow below steps.
Add VC1 & VC2 as a childVC of mainVC.
On segment 1 selection VC1.view.hidden = false & vc2.view.hidden = true
On segment 2 selection VC2.view.hidden = false & vc1.view.hidden = true
take reference
How-to-add-childVC
How-tobind-segment-control-action
Code work
#IBAction func indexChanged(_ sender: AnyObject) {
switch segmentedControl.selectedSegmentIndex
{
case 0:
vc1.view.hidden = false
vc2.view.hidden = true
case 1:
vc2.view.hidden = false
vc1.view.hidden = true
default:
break
}
}

Answer 2

The accepted answer is obviously correct, but I honestly prefer using container view for each tab in UISegmentedControl. It that way the logic related with each view is separated in different view controller. You can achieve this in that way:
class TopViewController: UIViewController {
#IBOutlet weak var firstContainerView: UIView!
#IBOutlet weak var secondContainerView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
firstContainerView.alpha = 1.0
secondContainerView.alpha = 0.0
}
#IBAction func didChangeIndex(_ sender: UISegmentedControl) {
switch sender.selectedSegmentIndex {
case 0:
firstContainerView.alpha = 1.0
secondContainerView.alpha = 0.0
case 1:
firstContainerView.alpha = 0.0
secondContainerView.alpha = 1.0
default:
break
}
}
}
If you would like to access properties of FirstViewController or SecondViewController, you can implement prepare(for segue: UIStoryboardSegue, sender: Any?) method.

Answer 3

You should add vc, and the vc.view to the Main ViewController:
When you select the Segmented Control, you can hide the sub viewcontroller's view like below:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIStoryboard *sb = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
_vc1 = [sb instantiateViewControllerWithIdentifier:#"ViewController1"];
_vc2 = [sb instantiateViewControllerWithIdentifier:#"ViewController2"];
[self addChildViewController:_vc1];
[self addChildViewController:_vc2];
[self.view addSubview:_vc1.view];
[self.view addSubview:_vc2.view];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)segAction:(UISegmentedControl *)sender {
if (1 == sender.selectedSegmentIndex) {
NSLog(#"1");
_vc1.view.hidden = YES;
_vc2.view.hidden = NO;
}else {
NSLog(#"%ld", sender.selectedSegmentIndex);
_vc2.view.hidden = YES;
_vc1.view.hidden = NO;
}
}