ios - 在没有 Storyboard的情况下使用 UISearchController

Question

我是 iOS 的新手(100 小时左右)，我正在尝试实现一个没有 Storyboard的 UISearchController。是否可以通过编程方式执行此操作？

Answer 1

您必须实现 UISearchController以编程方式进行，因为 Apple 尚未提供使用 Storyboard 进行设置的能力。

以下是实现 UISearchController 的步骤在 View Controller 中

• 符合UISearchResultsUpdating协议(protocol)

• 创建一个变量来引用 UISearchController

  var searchController: UISearchController!
  

• 设置searchController在viewDidLoad(_:)

  override func viewDidLoad() {
      super.viewDidLoad()
  
      searchController = UISearchController(searchResultsController: nil)
  
      // The object responsible for updating the contents of the search results controller.
      searchController.searchResultsUpdater = self
  
      // Determines whether the underlying content is dimmed during a search.
      // if we are presenting the display results in the same view, this should be false
      searchController.dimsBackgroundDuringPresentation = false
  
      // Make sure the that the search bar is visible within the navigation bar.
      searchController.searchBar.sizeToFit()
  
      // Include the search controller's search bar within the table's header view.
      tableView.tableHeaderView = searchController.searchBar
  
      definesPresentationContext = true
  }
  

• 实现方法updateSearchResultsForSearchController(_:) ，当搜索栏成为第一响应者或用户更改搜索栏内的文本时调用

  func updateSearchResultsForSearchController(searchController: UISearchController) {
      // No need to update anything if we're being dismissed.
      if !searchController.active {
          return
      }
  
      // you can access the text in the search bar as below
      filterString = searchController.searchBar.text
  
      // write some code to filter the data provided to your tableview
  }