在iOS 8中的导航栏中显示搜索栏 [英] Displaying search bar in navigation bar in iOS 8

问题描述

UISearchDisplayController 有一个 boolean 属性名为 displaysSearchBarInNavigationBar 。在iOS 8中，我的搜索栏向上移动了什么？非常感谢任何指导。

UISearchDisplayController had a boolean property called displaysSearchBarInNavigationBar. What's the equivalent in iOS 8 to have my search bar move up there? Any guidance is greatly appreciated.

这是我的代码，我不完全确定为什么这不起作用。当我单击搜索栏时，它会消失而不是移动自身和导航栏。

Here's my code, I'm not entirely sure why this isn't working. When I click the search bar, it just disappears instead of moving itself and the navigation bar up.

import UIKit

class ViewController: UIViewController, UISearchResultsUpdating, UISearchControllerDelegate, UISearchBarDelegate, UITableViewDelegate, UITableViewDataSource {

let searchController = UISearchController(searchResultsController:  nil)

var tableView = UITableView()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    self.searchController.searchResultsUpdater = self
    self.searchController.delegate = self
    self.searchController.searchBar.delegate = self

    self.searchController.hidesNavigationBarDuringPresentation = true
    self.searchController.dimsBackgroundDuringPresentation = true

    tableView.dataSource = self
    tableView.delegate = self


    self.navigationItem.titleView = searchController.searchBar


    self.definesPresentationContext = true

    self.setupSearchBar()




}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func updateSearchResultsForSearchController(searchController: UISearchController) {

}

func setupSearchBar() {

    // Set search bar position and dimensions
    var searchBarFrame: CGRect = self.searchController.searchBar.frame
    var viewFrame = self.view.frame
    self.searchController.searchBar.frame = CGRectMake(searchBarFrame.origin.x, searchBarFrame.origin.y + 64,viewFrame.size.width, 44)


    // Add search controller's search bar to our view and bring it to forefront
    self.view.addSubview(self.searchController.searchBar)

}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    var cell = UITableViewCell()

    return cell
}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 5
}
}

推荐答案

根据Apple的说法：

According to Apple :

UISearchDisplayController 已被弃用iOS 8.（注意 UISearchDisplayDelegate 也已弃用。）要管理搜索栏的显示并在iOS 8及更高版本中显示搜索结果，请改用 UISearchController 。

UISearchDisplayController is deprecated in iOS 8. (Note that UISearchDisplayDelegate is also deprecated.) To manage the presentation of a search bar and display search results in iOS 8 and later, instead use UISearchController.

UISearchController 类定义了一个界面，用于管理与搜索结果控制器内容一致的搜索栏的显示。搜索结果控制器， UIViewController 对象/index.html#//apple_ref/occ/instp/UISearchController/searchResultsControllerrel =noreferrer> searchResultsController 属性，管理搜索结果。

The UISearchController class defines an interface that manages the presentation of a search bar in concert with the search results controller’s content. The search results controller, a UIViewController object specified by the searchResultsController property, manages the results of the search.

现在您可以使用 UISearchController 来显示导航中的搜索栏bar以下列方式：

Now you can use the UISearchController to show the search bar in your navigation bar in the following way:

class ViewController: UIViewController, UISearchControllerDelegate, UISearchResultsUpdating, UISearchBarDelegate {

    var searchController : UISearchController!

    override func viewDidLoad() {
       super.viewDidLoad()

       self.searchController = UISearchController(searchResultsController:  nil)

       self.searchController.searchResultsUpdater = self
       self.searchController.delegate = self
       self.searchController.searchBar.delegate = self

       self.searchController.hidesNavigationBarDuringPresentation = false
       self.searchController.dimsBackgroundDuringPresentation = true

       self.navigationItem.titleView = searchController.searchBar

       self.definesPresentationContext = true        
    }

    func updateSearchResults(for searchController: UISearchController) {

    }

    override func didReceiveMemoryWarning() {
       super.didReceiveMemoryWarning()
       // Dispose of any resources that can be recreated.
    }
}

但你必须考虑你需要设置一个 UINavigationController 就像在这个故事板中一样：

But you have to consider you need to set a UINavigationController like in this Storyboard :

您可以轻松选择 ViewController 并查看以下步骤：

You can do it very easy just select your ViewController and see the following steps:

然后，当您在搜索栏中点击以下图片时，您应该会在设备中看到：

And then you should see in your device when you make click in the search bar the following picture:

我希望这个帮助你

这篇关于在iOS 8中的导航栏中显示搜索栏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！