搜索栏在 swift 3 中不起作用。无法将类型 (_) -> Bool 的值转换为预期的参数类型 NSPredicate

Posted 2023-03-14

【中文标题】搜索栏在 swift 3 中不起作用。无法将类型 (_) -> Bool 的值转换为预期的参数类型 NSPredicate

【英文标题】：Search bar is not working in swift 3. Cannot convert value of type (_) -> Bool to expected argument type NSPredicate

【发布时间】：2017-04-28 12:00:35

【问题描述】：

不断显示错误：无法将类型 (_) 的值 -> Bool 转换为预期的参数类型 NSPredicate 上线：

filtered = OrdersArray.filter(using:  (text) -> Bool in
            let tmp: NSString = text
            let range = tmp.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch)

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) 

        filtered = OrdersArray.filter(using:  (text) -> Bool in
            let tmp: NSString = text
            let range = tmp.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch)
            return range.location != NSNotFound
        )

        if(filtered.count == 0)
            searchActive = false;
         else 
            searchActive = true;
        
        self.tableView.reloadData()
    

UISearchBarDelegate、UISearchDisplayDelegate 代表都被标记 searchBarTextDidBeginEditing, searchBarTextDidEndEditing, searchBarCancelButtonClicked, searchBarSearchButtonClicked 函数写成 请告诉我在NSMutableArray 中搜索数据的其他方法。

这是我的数组。

orders =     (
            
        "created_at" = "2017-05-01 04:49:17";
        id = 591;
        "order_status" = CONFIRMED;
        "pickup_code" = 4356219;
        store =             
            address1 = "**********";
            city = "**********";
            description = "*************";
            logo = "fghdshdx.png";
            name = "*******";
            "postal_code" = 110006;
            storeTotal = "20.00";
            "store_id" = 4;
            "tin_number" = M1O2R3E4MORE;
        ;
        total = "20.00";
        "updated_at" = "2017-05-01 04:49:20";
        "user_address_id" = "<null>";
        "user_id" = 5372;
        "user_name" = "Amit Sinha";
    
);
status = 1;

【问题讨论】：

filtered 数组的类型是什么，OrdersArray 也包含字符串作为对象？

@NiravD var OrdersArray = NSMutableArray(), var filters:[String] = []

@RajatAttri 像这样你必须做 var OrdersArray = [String]() 和 var filters:[String] = [] 并且在视图中确实加载了你可以分配 OrdersArray = ["San Francisco", "纽约","圣何塞","芝加哥","洛杉矶","奥斯汀","西雅图"]

@RajatAttri Sweeper 已发布解决方案。

@RajatAttri 试试这个： let namePredicate = NSPredicate(format: "yourkey %@","searched text");// 用 yourkey 替换你的密钥 let filters = (self.arrQuestions as NSArray).过滤（使用：namePredicate）

【参考方案1】：

不要使用NSArray！

我猜你的OrdersArray 是NSArray 或NSMutableArray。您应该先将其转换为 swift 数组：

let swiftArray = Array(OrdersArray).map   $0 as! NSString 

然后过滤swift数组：

filtered = swiftArray.filter(using:  (text) -> Bool in
    let range = tmp.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch)
    return range.location != NSNotFound
)

【讨论】：

无法将“__NSDictionaryM”（0x1a7a25c50）类型的值转换为“NSString”（0x1a7a35ae8）。 2017-05-01 10:31:03.423309+0530 UniShop Merchant [3029:1014358] 无法将“__NSDictionaryM”（0x1a7a25c50）类型的值转换为“NSString”（0x1a7a35ae8）。

【参考方案2】：

试试这个！来自This的参考

  import UIKit

class SearchViewController: UIViewController,UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate 


    @IBOutlet weak var searchBar: UISearchBar!
    @IBOutlet weak var SearchTableView: UITableView!

    var searchActive : Bool = false
    var data = ["San Francisco","New York","San Jose","Chicago","Los Angeles","Austin","Seattle"]
    var filtered:[String] = []

    override func viewDidLoad() 
        super.viewDidLoad()

        /* Setup delegates */
        SearchTableView.delegate = self
        SearchTableView.dataSource = self
        searchBar.delegate = self
    
    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()

    

    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) 
        searchActive = true;
    

    func searchBarTextDidEndEditing(_ searchBar: UISearchBar) 
        searchActive = false;
    

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) 
        searchActive = false;
    

    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) 
        searchActive = false;
    

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) 

        filtered = data.filter( (text) -> Bool in
            let tmp: NSString = text as NSString
            let range = tmp.range(of: searchText, options: .caseInsensitive)
            return range.location != NSNotFound
        )
        if(filtered.count == 0)
            searchActive = false;
         else 
            searchActive = true;
        
        SearchTableView.reloadData()
    



    func numberOfSectionsInTableView(tableView: UITableView) -> Int 
        return 1
    

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
        if(searchActive) 
            return filtered.count
        
        return data.count;
    

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell")! as UITableViewCell;
        if(searchActive)
            cell.textLabel?.text = filtered[indexPath.row]
         else 
            cell.textLabel?.text = data[indexPath.row];
        

        return cell;
    

【讨论】：

我看过这段代码：它属于achrak，我只是从那里复制的，它不起作用

@RajatAttri 它对我有用，我在 swift3 中更新代码

NSMutableArray = OrderArray, Filtered 和 urs 一样！还是不行

你能告诉我你如何声明和初始化数组吗