viewController.view does not showing but it appears when ViewDebugMode - ios

Question

I'm creating Slide Menu using PanGesture and addChild.
Although ParentViewController was able to slide to the left, MenuViewController placed just to the right of it is not displayed.
However, when you check with ViewDebug, it certainly exists and is placed in the expected location.
But why isn't it displayed on the actual screen?
👇 when view was panned
👇 when View Debug and this button tapped
class ParentViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.isUserInteractionEnabled = true
view.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(panGesturePanned)))
let menuViewController = MenuViewController()
menuViewController.view.frame = CGRect(
x: view.frame.maxX,
y: 0,
width: view.bounds.width,
height: UIScreen.main.bounds.height)
view.addSubview(menuViewController.view)
addChild(menuViewController)
menuViewController.didMove(toParent: self)
}
#objc private func panGesturePanned(gesture: UIPanGestureRecognizer) {
guard let gestureView = gesture.view else { return }
switch gesture.state {
case .began:
print()
case .changed:
tabBarController?.view.frame.origin.x = min(max(gesture.translation(in: gestureView).x, -240), 0)
case .cancelled:
print()
case .ended:
print()
default: break
}
}
}

Answer 1

You are moving tabBarController, but as I understand you want to move menuViewController. Try this:
#objc private func panGesturePanned(gesture: UIPanGestureRecognizer) {
guard let gestureView = gesture.view else { return }
switch gesture.state {
case .began: break
case .changed:
tabBarController?.view.frame.origin.x = max(-menuViewController.view.bounds.width, gesture.translation(in: gestureView).x)
menuViewController.view.frame.origin.x = max(0, menuViewController.view.bounds.width - gesture.translation(in: gestureView).x)
case .cancelled: break
case .ended: break
default: break
}
}