在 iOS 8 中的导航栏中显示搜索栏

Question

UISearchDisplayController 有一个 boolean 属性叫 displaysSearchBarInNavigationBar。在 iOS 8 中有什么等价物可以让我的搜索栏向上移动？非常感谢任何指导。

这是我的代码，我不完全确定为什么它不起作用。当我单击搜索栏时，它只是消失了，而不是将其自身和导航栏向上移动。

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
}
}

Answer 1

根据 Apple 的说法：

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.

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 按以下方式在导航栏中显示搜索栏：

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.
    }
}

但是你必须考虑到你需要设置一个 UINavigationController 就像在这个 Storyboard 中一样：

您只需 select 您的 ViewController 即可轻松完成，并查看以下步骤：

然后当您在搜索栏中单击时，您应该会在设备中看到以下图片：

希望对你有所帮助

在 iOS 8 中的导航栏中显示搜索栏

Displaying search bar in navigation bar in iOS 8

uisearchbar

uisearchdisplaycontroller

ios8