我在UINavigationBar
里面有一个UISearchController
。用户必须点击一个 UIBarButtonItem
,我在其中实例化一个新UIViewController
然后显示它,以便开始搜索。
class ViewController: UIViewController {
var searchController: UISearchController!
override func viewDidLoad() {
super.viewDidLoad()
setupSearchController()
}
func setupSearchController() {
searchController = UISearchController(searchResultsController: nil)
searchController.searchBar.delegate = self
searchController.searchResultsUpdater = self
searchController.searchBar.showsCancelButton = true
searchController.dimsBackgroundDuringPresentation = false
searchController.hidesNavigationBarDuringPresentation = false
definesPresentationContext = true
navigationItem.titleView = searchController.searchBar
}
}
我事先做了很多研究,但仍然无法找到解决方案......
帮助使搜索控制器成为第一响应者将不胜感激。
让UISearchBar
成为主线程上的第一个响应者是解决方案。
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
DispatchQueue.main.async {
self.searchController.searchBar.becomeFirstResponder()
}
}