swift - 加载 Controller 时激活 UISearchBar

Question

我有以下 SearchController:

class SearchController: UITableViewController, UISearchResultsUpdating

实现效果很好，但每次加载 Controller 时我都必须点击搜索栏开始搜索。我想要的是在加载 SearchController 后激活搜索栏。我试过:

override func viewDidLoad() {
    super.viewDidLoad()

    ...
    ...

    self.resultSearchController.searchBar.becomeFirstResponder()
}

我也尝试过:

override func viewDidAppear(animated: Bool) {
    self.resultSearchController.searchBar.becomeFirstResponder()
}

但搜索栏仍处于停用状态，键盘也不会出现。我错过了什么？谢谢!

Answer 1

这有效(不知道为什么它不适合你):

class ViewController: UIViewController {

    let mySearchController = UISearchController(searchResultsController: nil)

    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.titleView = mySearchController.searchBar
        mySearchController.hidesNavigationBarDuringPresentation = false
        mySearchController.searchBar.becomeFirstResponder()
    }
}