Question

我在项目中使用xCode 9，swift 4和“ Eureka表单库”。

情况

我有一个具有以下名称和唯一ID的汽车列表：0-任何，1-大众，7-奥迪，20-马自达

var name_cars: [String] = ["ANY","VW","AUDI","MAZDA"]

var id_cars:[Int] = [0, 1, 7, 20]

我也有一个带有“ PushRow”和“ ButtonRow”的表格。在单击按钮时，我要打印所选的汽车名称和ID。我可以打印汽车的名称，但不能打印ID。

import UIKit
import Eureka

class myPage: FormViewController {

    var cars: [String] = ["ANY","VW","AUDI","MAZDA"]
    var id_cars:[Int] = [0, 1,7,20]

    var selected_car: String = "ANY" //default car
    var selected_car_id: Int = 0 //default id car

    override func viewDidLoad() {
        super.viewDidLoad()

        create_form()
    }

    func create_form(){

        form
        +++ Section("List")

        //list
        <<< PushRow<String>() {
            $0.title = "Cars"
            $0.options = cars
            $0.value = "ANY"

            $0.tag = "list_element"
            $0.selectorTitle = "Choose car"
            $0.onChange { [unowned self] row in
                self.selected_car = row.value!
                self.selected_car_id = ??? // **what should it be here in order to get the ID**
            }

        }

        //button
        <<< ButtonRow("Button1") {row in
            row.title = "Get Value on Console"
            row.onCellSelection{[unowned self] ButtonCellOf, row in
                print ("Car selected = ",self.selected_car, " and Id_Car_Selected = ",self.selected_car_id)
            }
        }
   }
}

Answer 1

首先，请遵循命名约定，即类名以大写字母开头，变量名称为 lowerCamelCased 而不是 snake_cased 。

Swift是一种面向对象的语言。而不是两个单独的数组使用自定义结构Car。

import UIKit
import Eureka

struct Car : Equatable {
    let name : String
    let id : Int
}

将推行声明为PushRow<Car>()，并在属性displayValueFor中填充名称

class MyPage: FormViewController {

    let cars = [Car(name: "ANY", id: 0), Car(name: "VW", id: 1), Car(name: "AUDI", id: 7), Car(name: "MAZDA", id: 20)]

    var selectedCar : Car!

    override func viewDidLoad() {
        super.viewDidLoad()
        selectedCar = cars[0]
        createForm()
    }


    func createForm() {

        form
            +++ Section("List")

            //list
            <<< PushRow<Car>() {
                $0.title = "Cars"
                $0.options = cars
                $0.value = selectedCar
                $0.displayValueFor = {
                    guard let car = $0 else { return nil }
                    return car.name
                }

                $0.tag = "list_element"
                $0.selectorTitle = "Choose car"
                $0.onChange { [unowned self] row in
                    self.selectedCar = row.value!
                }

            }

            //button
            <<< ButtonRow("Button1") {row in
                row.title = "Get Value on Console"
                row.onCellSelection{[unowned self] ButtonCellOf, row in
                    print ("Car selected = ", self.selectedCar.name, " and Id_Car_Selected = ", self.selectedCar.id)
                }
        }
    }
}

如何在Swift4中获取PushRow的值和id_value

1 个答案: