pushViewController popViewController

 

	class ViewController: UIViewController {
	override func viewDidLoad() {
	super.viewDidLoad()
	title = "PUSH"
	let push = UIButton(frame: CGRect(x: 0, y: 0, width: 150, height: 50))
	push.setTitle("push noti", for: .normal)
	push.setTitleColor(.red, for: .normal)
	push.center = view.center
	push.addTarget(self, action: #selector(clickPush), for: .touchUpInside)
	view.addSubview(push)
	}
	@objc func clickPush(){
	print("ttt")
	let secondVC = SecondViewController()
	self.navigationController?.pushViewController(secondVC, animated: true)
	}
	}
	class SecondViewController: UIViewController {
	override func viewDidLoad() {
	super.viewDidLoad()
	print("second")
	let pop = UIButton(frame: CGRect(x: 0, y: 0, width: 150, height: 50))
	pop.setTitle("push noti", for: .normal)
	pop.setTitleColor(.red, for: .normal)
	pop.center = view.center
	pop.addTarget(self, action: #selector(clickPop), for: .touchUpInside)
	view.addSubview(pop)
	}
	@objc func clickPop(){
	print("ttt")
	let secondVC = SecondViewController()
	navigationController?.popViewController(animated: true)
	}
	}

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