UINavigationBar 滑开而不是停留在原地 [英] UINavigationBar slides away instead of staying on place

问题描述

我创建了演示项目来显示问题.

I created demo project to show the problem.

我们在 UINavigationController 中有两个视图控制器.

We have two view controllers inside UINavigationController.

MainViewController 是根目录.

class MainViewController: UIViewController {

    lazy var button: UIButton = {
        let button = UIButton()
        button.setTitle("Detail", for: .normal)
        return button
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.title = "Main"
        view.backgroundColor = .blue
        view.addSubview(button)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        button.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        button.widthAnchor.constraint(equalToConstant: 150).isActive = true
        button.heightAnchor.constraint(equalToConstant: 42).isActive = true
        button.addTarget(self, action: #selector(buttonTapped(_:)), for: .touchUpInside)
    }

    @objc func buttonTapped(_ sender: UIButton) {
        navigationController?.pushViewController(DetailViewController(), animated: true)
    }
}

以及被推送的 DetailViewController.

class DetailViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        navigationController?.setNavigationBarHidden(true, animated: animated)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        navigationController?.setNavigationBarHidden(false, animated: animated)
    }
}

如你所见，我想在 DetailViewController 中隐藏 UINavigationBar:

As you can see I want to hide UINavigationBar in DetailViewController:

问题

问题在于，UINavigationBar 与整个 MainViewController 一起滑开而不是留在原地.我怎样才能改变这种行为并保持流行手势?

The problem is that, UINavigationBar slides away instead of stay of his place together with whole MainViewController. How can I change that behavior and keep pop gesture?

推荐答案

在你的 MainViewController 添加那个方法

in your MainViewController add that method

override func viewDidAppear(_ animated: Bool) {        
        UIView.animate(withDuration: 0) {
            self.navigationController?.setNavigationBarHidden(false, animated: false)
        }
    }

并在 DetailViewController 中用下面的方法替换你的方法

and replace your method with below method in DetailViewController

 override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    navigationController?.setNavigationBarHidden(true, animated: animated)
}

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