Ios 如何确定搜索栏的位置

我正在尝试使用来自的教程构建搜索函数 我需要更改他的密码 因为正如您从图片中看到的，如果我执行

navigationitem.titleview

plus按钮就会消失。我想在搜索时使用搜索栏，但找不到方法

 let searchBar = resultSearchController!.searchBar
        searchBar.sizeToFit()
        searchBar.placeholder = "Search for places"
        navigationItem.titleView = resultSearchController?.searchBar
        resultSearchController?.hidesNavigationBarDuringPresentation = false
        resultSearchController?.dimsBackgroundDuringPresentation = true
        definesPresentationContext = true
        locationSearchTable.mapView = mapView
        locationSearchTable.handleMapSearchDelegate = self

而不是

navigationItem.titleView = resultSearchController?.searchBar

试一试

navigationItem.searchController = resultSearchController