索引将搜索栏推到左侧

Question

我在tablview标题中有一个searchcontroller，但看起来tableview索引在右边引起了额外的填充。如何让searchcontroller文本字段中的左右填充相同？

var controller = UISearchController(searchResultsController: nil)
    self.controller = ({
            controller.searchResultsUpdater = self
            controller.dimsBackgroundDuringPresentation = false
            controller.searchBar.sizeToFit()
            controller.hidesNavigationBarDuringPresentation = false
            controller.loadViewIfNeeded()
            controller.delegate = self
            let textFieldInsideSearchBar = controller.searchBar.value(forKey: "searchField") as? UITextField
            textFieldInsideSearchBar?.leftViewMode = .always
            textFieldInsideSearchBar?.backgroundColor = "e8e8e9".hexColor
            textFieldInsideSearchBar?.rightViewMode = UITextFieldViewMode.whileEditing
            textFieldInsideSearchBar?.leftViewMode = UITextFieldViewMode.never
            controller.searchBar.barTintColor = "f6f6f6".hexColor
            self.tableView.tableHeaderView = controller.searchBar
            return controller
        })()