Swift UISearchController/导航控制器中的搜索栏

我有一个包含简单数据的TableView。我已经通过代码向导航控制器添加了搜索栏。（我不确定我是否采取了正确的方式，但它正在发挥作用）。这就是它的样子：

代码如下：

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!
    var data = ["Hello","This","Is","Table","View","With","Search","Bar","Included","In","NavBar","But","SearchBar","Is","Not","Done","Properly"]
    var filtered = [String]()
    override func viewDidLoad() {
        super.viewDidLoad()
        //My original array and filtered arrays.
        filtered = data
        // Here a play with preferences add/delete 
        let searchBar = UISearchController(searchResultsController: nil)
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationItem.searchController = searchBar
       navigationItem.searchController?.dimsBackgroundDuringPresentation = false
        navigationItem.searchController?.searchResultsUpdater = self
        navigationItem.hidesSearchBarWhenScrolling = false
    }
}

extension ViewController: UITableViewDataSource, UITableViewDelegate {

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return filtered.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell()
        cell.textLabel?.text = filtered[indexPath.row]
        return cell
    }

}

extension ViewController: UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        if searchController.searchBar.text! == "" {
            filtered = data
        }
        else {
            filtered = data.filter  {$0.lowercased().contains(searchController.searchBar.text!.lowercased())}
            }
        self.tableView.reloadData()
    }

}

navigationItem.searchController?.searchBar.tintColor = .white

navigationItem.searchController?.searchBar.barTintColor = .red

正如您所看到的，我通过创建SearchController，然后将其添加到NavController中来完成。 还实现了委托UISearchResultsUpdated方法来搜索和筛选

我尝试了几种方法，但我不知道如何访问SearchBar和NavController的属性。（不是通过故事板）

一些截图：

在经历了一天的搜索和尝试之后，我并不确定这一点，因为有些方法有效，但有些方法无效。例如：

这是有效的：

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!
    var data = ["Hello","This","Is","Table","View","With","Search","Bar","Included","In","NavBar","But","SearchBar","Is","Not","Done","Properly"]
    var filtered = [String]()
    override func viewDidLoad() {
        super.viewDidLoad()
        //My original array and filtered arrays.
        filtered = data
        // Here a play with preferences add/delete 
        let searchBar = UISearchController(searchResultsController: nil)
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationItem.searchController = searchBar
       navigationItem.searchController?.dimsBackgroundDuringPresentation = false
        navigationItem.searchController?.searchResultsUpdater = self
        navigationItem.hidesSearchBarWhenScrolling = false
    }
}

extension ViewController: UITableViewDataSource, UITableViewDelegate {

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return filtered.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell()
        cell.textLabel?.text = filtered[indexPath.row]
        return cell
    }

}

extension ViewController: UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        if searchController.searchBar.text! == "" {
            filtered = data
        }
        else {
            filtered = data.filter  {$0.lowercased().contains(searchController.searchBar.text!.lowercased())}
            }
        self.tableView.reloadData()
    }

}

navigationItem.searchController?.searchBar.tintColor = .white

navigationItem.searchController?.searchBar.barTintColor = .red

这不起作用：

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!
    var data = ["Hello","This","Is","Table","View","With","Search","Bar","Included","In","NavBar","But","SearchBar","Is","Not","Done","Properly"]
    var filtered = [String]()
    override func viewDidLoad() {
        super.viewDidLoad()
        //My original array and filtered arrays.
        filtered = data
        // Here a play with preferences add/delete 
        let searchBar = UISearchController(searchResultsController: nil)
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationItem.searchController = searchBar
       navigationItem.searchController?.dimsBackgroundDuringPresentation = false
        navigationItem.searchController?.searchResultsUpdater = self
        navigationItem.hidesSearchBarWhenScrolling = false
    }
}

extension ViewController: UITableViewDataSource, UITableViewDelegate {

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return filtered.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell()
        cell.textLabel?.text = filtered[indexPath.row]
        return cell
    }

}

extension ViewController: UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        if searchController.searchBar.text! == "" {
            filtered = data
        }
        else {
            filtered = data.filter  {$0.lowercased().contains(searchController.searchBar.text!.lowercased())}
            }
        self.tableView.reloadData()
    }

}

navigationItem.searchController?.searchBar.tintColor = .white

navigationItem.searchController?.searchBar.barTintColor = .red

那么，为什么我可以访问一个属性而不能访问另一个？ 这是一个非常简单的功能，但很难找到

也许你可以给我一些资源，我可以用在我的情况下，如图所示？ 或者，如果你有一个时间-一些解决方案，也许根的例子

提前谢谢

---

将继续搜索。

此答案有用吗感谢链接和努力。是的，我已经设法修复了一些案例，但还不知道如何改变背景。谢谢。我想你可以用setBackgroundImage来实现这一点，只需使用颜色值。你的意思是我可以将图像添加到搜索栏中，使其搜索字段变为白色？我已经很久没有这样做了，一些UI元素你可以使用颜色创建的图像来更改背景颜色。试试这个答案：