移除导航栏和工具栏的边框

Question

我在删除 UISearchBar、UINavigationBar 和 UIToolBar 的边框阴影时遇到问题。所以，基本上我有一个视图控制器，我在其中嵌入了一个 UISearchController，下面是一个具有 UISegmentedControl 的 UIToolbar。问题是，即使在使用外观（）委托单独删除 UINavigationBar、UISearchBar、UIToolbar 的边框阴影后，边框仍然会显示在 UISearchBar 和 UIToolBar 之间。

当我进入下一个屏幕时，我观察到 UINavigationBar 没有边框阴影，因此，可以肯定正在显示的边框不是 UINavigationBar。

我还发现一个奇怪的事情，当我从 UINavigationBar 隐藏 UISearchController 时，UINavigationBar 和 UIToolBar 之间没有边界。当我隐藏 UIToolBar 时，UINavigationBar 之后也没有边框。

extension AppDelegate {

    private func appearanceSetup() {
        UINavigationBar.appearance().barTintColor = .appBlueColor
        UINavigationBar.appearance().shadowImage = UIImage()
        UINavigationBar.appearance().titleTextAttributes = [NSAttributedString.Key.foregroundColor : UIColor.white]
        UITextField.appearance().tintColor = .appBlueColor
        UISearchBar.appearance().setBackgroundImage(UIImage(), for: .any, barMetrics: .default)
        UISearchBar.appearance().barTintColor = .appBlueColor
        UISearchBar.appearance().backgroundImage = UIImage()
        UIToolbar.appearance().setShadowImage(UIImage(), forToolbarPosition: .any)
        UIToolbar.appearance().barTintColor = .appBlueColor
        UIToolbar.appearance().layer.borderWidth = 1
        UIToolbar.appearance().layer.borderColor = UIColor.appBlueColor.cgColor
    }
}

class HomeViewController: UIViewController {
   private let searchController: UISearchController = {
        let searchController = UISearchController(searchResultsController: nil)
        searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchBar.placeholder = "Search"
        searchController.searchBar.tintColor = .white
        searchController.searchBar.barTintColor = .appBlueColor
        return searchController
    }()
    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.searchController = searchController
    }

Answer 1

self.navigationController?.navigationBar.setValue(true, forKey: "hidesShadow")

试试这个代码，希望它能解决你的问题

Answer 2

一旦我遇到了类似的问题，appeareance 并没有解决我的问题。所以我开始定制组件。我为UINavigationBar 做了这个并且它起作用了，虽然我的UINavigationBar 被放入了情节提要中，没有在代码中，但它仍然最有效。试试这个并告诉我：

class CustomNavigationBar: UINavigationBar
{
    override init(frame: CGRect) {
        super.init(frame: frame)
        setBackgroundImage(UIImage(), for: .default)
        shadowImage = UIImage()
        backgroundColor = <Your UIView.backgoundColor of type: UIColor>
        tintColor = UIColor.white
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setBackgroundImage(UIImage(), for: .default)
        shadowImage = UIImage()
        backgroundColor = <Your UIView.backgoundColor of type: UIColor>
        tintColor = UIColor.white
    }
}

我不知道您对UISearchController 的处理方法是什么，但我在 searchBar 中也遇到了同样的问题，所以我在代码中添加了 searchBar 并使用了委托。占位符出现两次，因为 iOS 的版本，只有一个在 iOS 10 或 iOS 10+ 以下无法正常工作。取决于哪一个会被删除

    override func viewDidLoad() {
        super.viewDidLoad()

        setup()
        installRefresh()
    }

    private func setup() {
        let searchBar = UISearchBar()
        searchBar.scopeButtonTitles = [placeholdetText] // The String for the place holder
        searchBar.searchBarStyle = .default
        searchBar.barTintColor = view.backgroundColor 
        searchBar.placeholder = placeholdetText + ".."
        searchBar.setBackgroundImage(UIImage(), for: .any, barMetrics: .default)
        searchBar.backgroundColor = UIColor.clear
        searchBar.delegate = self

        // Extra UI Setup
   }

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        if searchText.isEmpty
        {
            // The filters objects it's what i show after the search, and the 
            // general objects it's all the objects
            filtersObjects = generalObjects
        }
        else
        {
           //... Al the code tu filter from the searchText 
        }
          // Refresh the UI
    }

Answer 3

override func viewDidLoad() {
        super.viewDidLoad()

        //MARK:- for default navigation bar

        self.navigationItem.backBarButtonItem = UIBarButtonItem(title: " ", style: .plain, target: nil, action: nil)
        self.navigationItem.backBarButtonItem?.tintColor = UIColor.white

        self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for:.default)
        self.navigationController?.navigationBar.shadowImage = UIImage()
        self.navigationController?.navigationBar.layoutIfNeeded()

    }

Answer 4

覆盖 func viewDidLoad() { super.viewDidLoad()

    //MARK:- for default navigation bar

    self.navigationItem.backBarButtonItem = UIBarButtonItem(title: " ", style: .plain, target: nil, action: nil)
    self.navigationItem.backBarButtonItem?.tintColor = UIColor.white

    self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for:.default)
    self.navigationController?.navigationBar.shadowImage = UIImage()
    self.navigationController?.navigationBar.layoutIfNeeded()

}