UISearchDisplayController 错误 - 斯威夫特

Posted 2023-03-13

【中文标题】UISearchDisplayController 错误 - 斯威夫特

【英文标题】：UISearchDisplayController Error - Swift

【发布时间】：2015-11-06 10:12:08

【问题描述】：

我正在关注这个tutorial，但遇到了一些麻烦。 我正在实现一个搜索栏和显示控制器来过滤结果。

下面是我遇到的错误的图像：

主要错误有：

UISearchDisplayController 已弃用 不能为 [String] 类型的值下标？

任何解决这些问题的帮助都会有所帮助。

以下是我的其余代码：

    import UIKit

    class TableViewController: UITableViewController, UISearchBarDelegate, UISearchDisplayDelegate 

var candies = [Candy]()
var filteredCandies = [Candy]()
var resultSearchController = UISearchController()

override func viewDidLoad() 
    super.viewDidLoad()

    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem()

    self.candies = [Candy(category:"Chocolate", name:"Chocolate Bar"),
        Candy(category:"Chocolate", name:"chocolate chip"),
        Candy(category:"Hard", name:"lollipop"),
        Candy(category:"Hard", name:"candy cane"),
        Candy(category:"Other", name:"caramel"),
        Candy(category:"Chocolate", name:"chocolate chip")]

    self.tableView.reloadData()



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



func filterContentForSearchText(searchText: String, scope: String = "All")

    self.filteredCandies = self.candies.filter((candy: Candy) -> Bool in

        let categoryMatch = ( scope == "All") || (candy.category == scope)
        let stringMatch = candy.name.rangeOfString(searchText)
        return categoryMatch && (stringMatch != nil)
    )


func searchDisplayController(controller: UISearchDisplayController, shouldReloadTableForSearchString searchString: String?) -> Bool 
    let scopes = self.searchDisplayController!.searchBar.scopeButtonTitles
    let selectedScope = scopes[self.searchDisplayController!.searchBar.selectedScopeButtonIndex] as String
    self.filterContentForSearchText(searchString, scope: selectedScope)
    return true    

func searchController(controller: UISearchController, shouldReloadTableForSearchScope searchOption: Int) -> Bool 

    let scope = self.searchDisplayController!.searchBar.scopeButtonTitles
    self.filterContentForSearchText(self.searchDisplayController!.searchBar.text!, scope: scope[searchOption])
    return true


// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int 
    // #warning Incomplete implementation, return the number of sections
    return 1


override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    // #warning Incomplete implementation, return the number of rows
    if tableView == searchDisplayController!.searchResultsTableView 
        return self.filteredCandies.count
     else 

        return self.candies.count
    



override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
    let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)

    // Configure the cell...
    //let candy = self.candies[indexPath.row]

    var candy : Candy

    if tableView == self.searchDisplayController!.searchResultsTableView 
        candy = filteredCandies[indexPath.row]
    else 
        candy = candies[indexPath.row]
    
    cell.textLabel?.text = candy.name

    return cell

【参考方案1】：

UISearchDisplayController 已弃用

UISearchDisplayController 在 ios 8 中已被弃用。您可以使用UISearchController，它与UISearchDisplayController 非常相似。例如，查看本教程：http://www.jhof.me/simple-uisearchcontroller-implementation/

不能为 [String] 类型的值下标？

scopeButtonTitles 返回可选值，所以scopes 是一个可选值。可选数组必须在下标之前解包，以这种方式强制解包：

let scope = self.searchDisplayController!.searchBar.scopeButtonTitles
self.filterContentForSearchText(self.searchDisplayController!.searchBar.text!, scope: scope![searchOption])

或任何额外的可选检查逻辑：

if let scope = scope         
    self.filterContentForSearchText(self.searchDisplayController!.searchBar.text!, scope: scope[searchOption])
 else 
// handle error