导航栏中带有范围按钮的 iOS11 SearchController

Question

在 iOS 11 中，您可以使用几行代码将 UISearchController 放置在导航栏中。

我在 ViewController.swift 中设置了所有内容。

func setupNavBar() {
    navigationController?.navigationBar.prefersLargeTitles = true

    let searchController = UISearchController(searchResultsController: nil)
    searchController.searchResultsUpdater = wordViewController
    searchController.searchBar.scopeButtonTitles = ["French", "English"]
    searchController.searchBar.delegate = wordViewController

    navigationItem.searchController = searchController
    // Make searchbar persistent
    navigationItem.hidesSearchBarWhenScrolling = false
}

在我的代表中，搜索会正确触发和过滤。但是，如果我单击任一范围按钮，它们就会消失。该委托方法永远不会被调用。（按范围过滤尚未实际实现）

extension WordViewController: UISearchBarDelegate {

 func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {

    if let searchText = searchBar.text {
        print("Scoped changed: \(searchText)")
        filteredWordList = wordList.filter({$0.contains(searchText)})
    }
  }
}

完整源代码位于 Github 上：

https://github.com/melling/ios_topics/tree/master/NavBarSearch https://github.com/melling/ios_topics/tree/master/NavBarSearch/NavBarSearch

Answer 1

尝试在 setupNavBar() 中添加以下代码：

searchController.dimsBackgroundDuringPresentation = false