Swift如何删除searchController底部边框？

Question

此页面具有tableView和SearchController。我的问题是searchController边框。我无法删除边框

我尝试过： Remove border between View and Search Bar

Remove navigation bar bottom line when using search controller

Remove 1px line at top of UISearchController in large titles UINavigationBar

How to hide UINavigationBar 1px bottom line

How can I remove border bottom of UINavigationBar?

           if #available(iOS 11.0, *) {
                   let scb = searchController.searchBar
                   scb.tintColor = UIColor.white
                   scb.barTintColor = UIColor.white
                   scb.layer.masksToBounds = true
                   scb.layer.borderWidth = 10
                   scb.layer.borderColor = UIColor.clear.cgColor

                   if let textfield = scb.value(forKey: "searchField") as? UITextField {
                       textfield.layer.borderWidth = 2
                       textfield.layer.borderColor = UIColor.clear.cgColor
                       //textfield.textColor = // Set text color
                       if let backgroundview = textfield.subviews.first {
                           // Background color
                           backgroundview.backgroundColor = UIColor.white
                           backgroundview.layer.borderWidth = 0

                           backgroundview.layer.borderColor = UIColor.clear.cgColor
                           // Rounded corner
                           backgroundview.layer.cornerRadius = 10;
                           backgroundview.clipsToBounds = true;
                       }
                   }
                   if let navigationbar = self.navigationController?.navigationBar {
                       navigationbar.barTintColor = UIColor.clear
                   }
                               navigationItem.hidesSearchBarWhenScrolling = false

               }
                navigationItem.searchController = searchController

       navigationItem.largeTitleDisplayMode = .never

       self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white,NSAttributedString.Key.font: UIFont.systemFont(ofSize: 18, weight: .bold) ]
       searchController.obscuresBackgroundDuringPresentation = false
       searchController.searchBar.placeholder = "Search Candies"
       navigationItem.searchController = searchController
       definesPresentationContext = true

如何解决此问题？有想法吗？

Answer 1

一种解决方案是将导航栏的背景和阴影图像设置为空图像。

我又做了一个更改，只是发表评论

  

navigationItem.largeTitleDisplayMode =。从不

并添加这两行

  

navigationbar.setBackgroundImage（UIImage（），用于：.default）   navigationbar.shadowImage = UIImage（）

这是完整的代码：

 if #available(iOS 11.0, *) {
            let scb = searchController.searchBar
            scb.tintColor = UIColor.white
            scb.barTintColor = UIColor.white
            scb.layer.masksToBounds = true
            scb.layer.borderWidth = 10
            scb.layer.borderColor = UIColor.clear.cgColor

            if let textfield = scb.value(forKey: "searchField") as? UITextField {
                textfield.layer.borderWidth = 2
                textfield.layer.borderColor = UIColor.clear.cgColor
                //textfield.textColor = // Set text color
                if let backgroundview = textfield.subviews.first {
                    // Background color
                    backgroundview.backgroundColor = UIColor.white
                    backgroundview.layer.borderWidth = 0

                    backgroundview.layer.borderColor = UIColor.clear.cgColor
                    // Rounded corner
                    backgroundview.layer.cornerRadius = 10;
                    backgroundview.clipsToBounds = true;
                }
            }
            if let navigationbar = self.navigationController?.navigationBar {
                navigationbar.barTintColor = UIColor.white
                navigationbar.setBackgroundImage(UIImage(), for: .default)
                navigationbar.shadowImage = UIImage()

            }
            navigationItem.hidesSearchBarWhenScrolling = false
        }

//        navigationItem.largeTitleDisplayMode = .never
        self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white,NSAttributedString.Key.font: UIFont.systemFont(ofSize: 18, weight: .bold) ]
        searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchBar.placeholder = "Search Candies"
        navigationItem.searchController = searchController
        definesPresentationContext = true



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

    if let navigationbar = self.navigationController?.navigationBar {
        navigationbar.setBackgroundImage(UIImage(), for: .default)
        navigationbar.shadowImage = UIImage()
    }
}

请检查更新的代码。

Answer 2

创建UISearchController的扩展名：

extension UISearchController {

var hairlineView: UIView? {
    let barBackgroundView = searchBar.superview?.subviews.first { String(describing: type(of: $0)) == "_UIBarBackground" }
    
    guard let background = barBackgroundView else { return nil }
    return background.subviews.first { $0.bounds.height == 1 / self.traitCollection.displayScale }
    } 
}

在视图中调用此视图将布局子视图：

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    self.navigationItem.searchController?.hairlineView?.isHidden = true
}