隐藏UISearchController中搜索栏上的“取消”按钮 [英] Hiding Cancel button on search bar in UISearchController

问题描述

我正在尝试隐藏UISearchController中搜索栏的取消按钮，但遗憾的是在viewDidLoad（）中设置以下内容不起作用：

I'm trying to hide the Cancel button of the search bar in the UISearchController, but unfortunately setting the following in viewDidLoad() does not work:

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
}

我也尝试在此委托方法中使用上述代码：

I have also tried using the above code in this delegate method:

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。有什么建议吗？

This approach works but will show the Cancel button briefly before hiding it, which is not ideal. Any suggestions?

推荐答案

我最后继承了 UISearchBar 和 UISearchController 按照建议：

I ended up subclassing both UISearchBar and UISearchController as suggested:

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
        }
    }
}

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