当两个数组都由其自己的结构定义时，用第二个数组过滤数组

Question

我试图通过 theCaseDataArray 过滤 theDataArray，其中 theDataArray 中的 dataName 与 theCaseDataArray 中的 dataName 相匹配。从代码中可以看出，每个数组都由其自己的结构定义。我已经在代码中标记了需要帮助的行。我试过使用 $0 和我能想到的一切，但没有任何乐趣。我知道论坛上有很多类似的问题，但 none 看到包含针对这种特殊情况的答案。

import UIKit
import SQLite

struct Data_On_Case
{
    var dataID: Int64
    var dataName: String
}

struct MyData
{
    let dataID: Int64
    var dataName: String
    var dataType: String?
    var dataDescription: String?
    var pricePaid: Double?
    var shipping: Double?
    var datePurchased: String?
    var dataDuration: String?
    var manufacturer: String?
    var venue: String?
    var performanceLevel: String?
    var dataNotes: String?
    var dataStyle: String?
}

class Test_VC: UIViewController
{
    private let crossRefTable = Table("CrossRefCase_Data")
    private let crossRefRCaseID = Expression<Int64>("CaseID_CaseXRef")
    private let crossRefDataID = Expression<Int64>("DataID_CaseXRef")

    private var theDataArray = [MyData]()
    private let theDataTable = Table("My_Data")
    private let dataID = Expression<Int64>("DataID")
    private let data_Name = Expression<String>("Data_Name")

    private var searchBarShowing: Bool = false
    private var isSearching: Bool = false
    private var searchingArray = [MyData]()
    private var theCurrentArray = [MyData]()

    private var theCaseDataArray = [Data_On_Case]()

    @IBOutlet weak var theSearchBar: UISearchBar!

    override func viewDidLoad()
    {
        super.viewDidLoad()

    }
}

extension Test_VC: UISearchBarDelegate
{
    func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int)
    {
        switch selectedScope
        {
        case 0:
            searchingArray = theDataArray
            isSearching.toggle()

        case 1:

           // Cannot convert value of type '((Data_On_Case) throws -> Bool) throws -> Bool' to expected argument type '(MyData) throws -> Bool'
            // The line below is where I'm stuck. The error is shown above.
            searchingArray = theDataArray.filter(theCaseDataArray.contains(where:  ))

            isSearching = true

            self.theSearchBar.resignFirstResponder()
            theSearchBar.showsScopeBar = true

        default:
            return
        }
    }
}

Answer 1

使用filter如下，

searchingArray = theDataArray.filter { data in
    return self.theCaseDataArray.contains(where: { [=10=].dataName == data.dataName })
}

当两个数组都由其自己的结构定义时，用第二个数组过滤数组

Filter an array by a second array when both arrays are defined by its own struct

arrays

struct

swift

swift5