Question

我遵循了教程：https://kotlinlang.org/docs/tutorials/native/mpp-ios-android.html，并成功导出了Android的jar文件和iOS的框架。之后，我想实现一些更复杂的东西。我将Android Studio Kotlin与以下代码结合使用：

Model.kt：

package org.kotlin.mpp.mobile.BusinessLogic

abstract class Model{

var _id:Long = 0

abstract fun PolymorphismTest()
}

Sales.kt：

package org.kotlin.mpp.mobile.BusinessLogic

class Sales : Model() {

init {
    this._id = _counter
    _counter++

}
companion object {

    private var _counter: Long = 0

}

fun get_counter(): Long {
    return _counter
}

private val _salesItems:MutableList<SalesItem> = ArrayList()

fun SalesItems(): MutableList<SalesItem> {
    return _salesItems
}

fun TotalAmount():Double
{
    var totalAmount:Double = 0.0
    for(aSalesItem in _salesItems)
    {
        totalAmount += aSalesItem.SubTotal()
    }

    return totalAmount
}

fun AddSalesItem(salesItem: SalesItem)
{
    this._salesItems.add(salesItem)
}

fun AddSalesItem(itemName:String, itemCode:String, quantity:Double, amount:Double )
{
    val aSalesItem = SalesItem()
    aSalesItem._itemCode = itemCode
    aSalesItem._itemName = itemName
    aSalesItem._quantity = quantity
    aSalesItem._amount = amount
    this.AddSalesItem(aSalesItem)
}

fun ToString(): String {
    return "Sales: $this._id"
}


override fun PolymorphismTest() {
    println("This is method from Sales")
}

}

SalesItem.kt：

package org.kotlin.mpp.mobile.BusinessLogic

class SalesItem : Model() {

init {
    this._id = _counter
    _counter++
}
companion object {

    private var _counter: Long = 0
}

fun get_counter(): Long {
    return _counter
}

var _sales: Sales? = null

var _amount:Double = 0.toDouble()
var _quantity:Double = 0.toDouble()

fun SubTotal(): Double {
    return _amount * _quantity
}

var _itemName:String? = null
var _itemCode:String? = null


fun Sales():Sales?{
    return _sales
}

fun SalesItem(sales:Sales)
{
    _sales = sales
    this._id = _counter
    _counter++
}

fun ToString(): String {
    return "Sales: $this._id"
}

override fun PolymorphismTest() {
    println("This is method from SalesItem")
}
}

我将这些代码导出到框架中，然后导入Xcode并使用Swift进行调用

ViewController.swift

import UIKit
import SharedCode
class ViewController: UIViewController{

override func viewDidLoad(){
     super.viewDidLoad()

     print("Creating Sales Object")
     let sales = Sales() //error here

   }
 }

之后，我遇到了

的错误

kotlin.Error，kotlin.RuntimeException和子类的实例不会从Kotlin传播到Objective-C / Swift。如果方法具有或继承@Throws批注，则其他异常可以作为NSError传播。未捕获的Kotlin异常：kotlin.native.concurrent.InvalidMutabilityException：冻结的org.kotlin.mpp.mobile.BusinessLogic.Sales.Companion@228b588的突变尝试在0 SharedCode处

Answer 1

Kotlin / Native具有不同的线程模型。这个想法是必须冻结对象的实例才能从所有线程访问它。有.freeze()个扩展方法。

默认情况下，object Smth也被冻结。在代码狙击手中，伴随对象中具有可变字段。

可能的解决方法是用您明确创建的普通类替换伴侣对象

https://kotlinlang.org/docs/reference/native/concurrency.html#concurrency-in-kotlinnative

https://kotlinlang.org/docs/reference/native/immutability.html#immutability-in-kotlinnative

从Kotlin / Native框架快速调用类

1 个答案: