gmsautoCompleteResultsView控制器显示的结果有限吗?

我正在使用 gmsautoCompleteResultsView控制器 对于谷歌自动完成搜索的地方。当我用这个搜索时,它显示的结果非常有限。它不显示所有的结果。此外,当它在Android中使用时,会显示许多结果。请告诉我我错过了什么。

 override func viewDidLoad() {
        super.viewDidLoad()

        resultsViewController = GMSAutocompleteResultsViewController()
        resultsViewController?.delegate = self

        searchController = UISearchController(searchResultsController: resultsViewController)
        searchController?.searchResultsUpdater = resultsViewController

        // Put the search bar in the navigation bar.
        searchController?.searchBar.sizeToFit()
        navigationItem.titleView = searchController?.searchBar

        // When UISearchController presents the results view, present it in
        // this view controller, not one further up the chain.
        definesPresentationContext = true
        // Prevent the navigation bar from being hidden when searching.
        searchController?.hidesNavigationBarDuringPresentation = false
    }