swift - 更新到 iOS 11 后，我的搜索栏表现很奇怪

Question

更新到 iOS11 后，我的搜索栏行为非常奇怪。激活后，它会跳转到屏幕顶部。它像以前一样正常工作，但我当然希望它保持在原位。我通过谷歌搜索这种行为尝试了很多解决方案，但没有任何帮助。有人有同样的问题吗？您采取了什么措施来解决这个问题？

searchBar in place

searchBar jumped to top

var searchController: UISearchController!


        override func viewDidLoad() {
            super.viewDidLoad()
            // Setup the Search Controller
            searchController = UISearchController(searchResultsController: nil)
            searchController.searchResultsUpdater = self
            searchController.dimsBackgroundDuringPresentation = false
            searchController.hidesNavigationBarDuringPresentation = false
            searchController.searchBar.preservesSuperviewLayoutMargins = true
            searchController.obscuresBackgroundDuringPresentation = false
            searchController.searchBar.sizeToFit()
            walkaboutTableView.tableHeaderView = searchController.searchBar
            searchController.searchBar.barTintColor = matildaLightBlue
            searchController.searchBar.clipsToBounds = true
            searchController.searchBar.layer.borderWidth = 2
            searchController.searchBar.layer.borderColor = UIColor.black.cgColor
    }

Answer 1

将搜索 Controller 实例添加到导航项而不是表标题 View 中可以帮助我解决项目中的类似问题。

if #available(iOS 11, *) {
   navigationItem.searchController = searchController
} else {
   tableView.tableHeaderView = searchController.searchBar
}

navigationItem.searchController

navigationItem.hidesSearchBarWhenScrolling