侧滑导航栏消失问题笔记

Posted on Edited on In

如果前页面和后页面不同，则会出现轻微侧滑时导航栏莫名其妙没了😂

Demo-PushAndPop

Demo-PushAndPop

[已解决] 隐藏导航栏+改变状态栏样式时出现导航栏莫名其妙没了

问题

snapshot

当ViewController.swift实现

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override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
}

时，两个ViewController对应的UIStatusBarStyle不同，则会出现如上图。UIStatusBarStyle一致则正常。

解决关键

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class NavigationController: UINavigationController {
    override var childViewControllerForStatusBarStyle: UIViewController? {
        return topViewController
    }
}

只需要将childViewControllerForStatusBarStyle设置为UINavigationController.topViewController即可。

另外

附上BViewController中相关代码。在切换的两个UIViewController的preferredStatusBarStyle一样时，不需要设置UINavigationController.childViewControllerForStatusBarStyle。

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class BViewController: UIViewController {

    var navigationBarHidden = false

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        guard let navigationController = navigationController  else {
            return
        }
        if navigationController.isNavigationBarHidden != navigationBarHidden {
            navigationController.setNavigationBarHidden(navigationBarHidden, animated: animated)
        }
    }
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        guard let navigationController = navigationController  else {
            return
        }
        guard let last = navigationController.viewControllers.last as? BViewController else {
            return
        }
        if last.navigationBarHidden != navigationBarHidden {
            navigationController.setNavigationBarHidden(last.navigationBarHidden, animated: animated)
        }
    }
}

感谢

  • @木头 viewWillAppear更换为viewDidAppear然后调试，在Demo中测试也可以曲线救国。
  • @Harry 提供的终极大法～