ios – 隐藏UISearchController中搜索栏上的“取消”按钮

我试图隐藏UISearchController中搜索栏的“取消”按钮,但不幸的是在viewDidLoad()中设置以下内容不起作用：

override func viewDidLoad() {
    super.viewDidLoad()

    searchResultsTableController = UITableViewController()
    searchResultsTableController.tableView.delegate = self

    searchController = UISearchController(searchResultsController: searchResultsTableController)
    searchController.searchResultsUpdater = self
    searchController.searchBar.sizetoFit()
    searchResultsView.tableHeaderView = searchController.searchBar

    searchController.delegate = self
    searchController.dimsBackgroundDuringPresentation = false
    searchController.searchBar.delegate = self

    searchController.searchBar.searchBarStyle = .Minimal
    searchController.searchBar.showsCancelButton = false

    definesPresentationContext = true
}

我也试过在这个委托方法中使用上面的代码：

func didPresentSearchController(searchController: UISearchController) {
    searchController.searchBar.showsCancelButton = false
}

这种方法有效但在隐藏之前会短暂显示取消按钮,这并不理想.有什么建议？

解决方法

我按照建议继承了UISearchBar和UISearchController的子类：

CustomSearchBar.swift

import UIKit

class CustomSearchBar: UISearchBar {

    override func layoutSubviews() {
        super.layoutSubviews()
        setShowsCancelButton(false,animated: false)
    }
}

CustomSearchController.swift

import UIKit

class CustomSearchController: UISearchController,UISearchBarDelegate {

    lazy var _searchBar: CustomSearchBar = {
        [uNowned self] in
        let result = CustomSearchBar(frame: CGRectZero)
        result.delegate = self

        return result
    }()

    override var searchBar: UISearchBar {
        get {
            return _searchBar
        }
    }
}