我正在推送一个视图控制器,我想要一个搜索栏,但搜索栏根本没有显示出来。以下是代码。我错过了什么吗?
var searchController = UISearchController(searchResultsController: nil)
searchController.searchResultsUpdater = self
searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search here..."
definesPresentationContext = true
searchController.searchBar.delegate = self
searchController.searchBar.sizeToFit()
if #available(iOS 11.0, *) {
self.navigationItem.searchController = searchController
} else {
// Fallback on earlier versions
navigationItem.titleView = searchController.searchBar
navigationItem.titleView?.layoutSubviews()
}