ios - 如何在出现 searchController 时自动显示键盘

Question

@IBAction func MapSearchController(_ sender: UIBarButtonItem) {

    let searchTable = storyboard!.instantiateViewController(withIdentifier: "SearchTableViewController") as! SearchTableViewController

        mapSearchController = UISearchController(searchResultsController: searchTable)
        mapSearchController.searchResultsUpdater = searchTable
        present(mapSearchController!, animated: true, completion: nil)
        mapSearchController.searchBar.becomeFirstResponder()
        self.mapSearchController.dimsBackgroundDuringPresentation = true
        self.mapSearchController.searchBar.sizeToFit()
        self.mapSearchController.searchBar.barTintColor = UIColor.black
        self.mapSearchController.searchBar.placeholder = "חפש ברים"
        self.mapSearchController.hidesNavigationBarDuringPresentation = true
        mapSearchController.searchBar.delegate = self
        definesPresentationContext = true
        searchTable.mapView = mapView
        searchTable.handleMapSearchDelegate = self

如何在出现 searchController 时自动显示键盘？我尝试了很多解决方案，但没有一个对我有用......包括 becomeFirstResponder() 等等......请帮忙

Answer 1

问题是加载 View ID 时不显示搜索 Controller ，因此即使在 make becomeFirstResponder 之后也不能解决问题。下面的代码将解决这个问题，并在搜索栏中使用光标打开键盘。

override func viewDidAppear(_ animated: Bool) {
    DispatchQueue.main.async {
        self.searchController.searchBar.becomeFirstResponder()
    }
}