UISearchController SearchBar changes after click cancel button

问题

I have UISearchController in my app:

    searchController = UISearchController(searchResultsController: nil)
    searchController.searchResultsUpdater = self
    if #available(iOS 9.1, *) {
        searchController.obscuresBackgroundDuringPresentation = false
    }

    searchController.searchBar.frame = searchBarView.frame

    searchBarView.addSubview(searchController.searchBar)
    searchController.searchBar.delegate = self

The problem is that when I enter the SearchBar and then click the cancel button the search bar not back to the frame I define here(and stretched to full size screen):

searchController.searchBar.frame = searchBarView.frame

Any idea what can be the problem?

来源：https://stackoverflow.com/questions/57647341/uisearchcontroller-searchbar-changes-after-click-cancel-button