Question

我不是CoreData的新手，我有一个用于初始化所有对象的类，将它们设置在数组中，并使用.append从pickerView数组追加到TableView数组。当然，终止应用程序后，将清除tableview数组。我正在尝试使用核心数据进行保存，但tableView现在返回了代码中的每个对象。如何选择一个对象并将其设置为tableView使用的数组。预先感谢

SavedRun是我的实体

import Foundation
import CoreData


extension SavedRun {

@nonobjc public class func fetchRequest() -> NSFetchRequest<SavedRun> {
    return NSFetchRequest<SavedRun>(entityName: "SavedRun")
}

@NSManaged public var formulaTitle: String?
@NSManaged public var formulaNumber: String?
@NSManaged public var base: String?
@NSManaged public var baseValue: Double
@NSManaged public var vit: String?
@NSManaged public var vitValue: Double
@NSManaged public var min: String?
@NSManaged public var minValue: Double
@NSManaged public var verdNat: String?
@NSManaged public var verdNatValue: Double


}

然后在我的init课上。

import UIKit

class AllFormulasTest {

var pickerArr = [SavedRun]()
static var tableArr : [SavedRun] = []

init() {

    let F1354670 = SavedRun(context: PersistenceService.context)
    F1354670.formulaNumber = "F1354670"
    F1354670.formulaTitle = "test formula title"
    F1354670.base = "Base name"
    F1354670.baseValue = 251.90
    F1354670.vit = "Vit name"
    F1354670.vitValue = 50.38
    F1354670.min = "Min name"
    F1354670.minValue = 45.34
    F1354670.verdNat = "Verd name"
    F1354670.verdNatValue = 16.79

    // I have about 200  formulas like the one above I use for my work.

    // pickerArr is used for my pickerView then appened to tableArr array of what needs to be made.
    pickerArr = [F1354670, F1354670, F1354670, F1354670, F1354670]
    // pickerArr returns all the ones created (not just 'F1354670') and works great.

    //this array needs to be what is shown on the tableView
    AllFormulas.tableArr = [] as? [SavedRun] ?? []

    // but.. I think doing it this way is acutally saving F1354670 into 'SavedRun'
    // which causes tableArr array to show them aswell 
    }

}

我如何才能使公式像数据库一样，直到从pickerArr中选择出来才显示在tableArr中。

先谢谢您

如何初始化核心数据对象

0 个答案: