在Swift中将数据附加到全局数组

Question

我在我的应用程序中创建了一个全局数组，并在不同的类中访问它，但是当我在不同的类中向数组附加数据时，我只得到了最后附加的数据。我的代码如下：

struct Vehicle {
    var name: String
    var location: String
    var price: String
    var owner: String
}


class GlobalArray {
    static let shared = GlobalArray()
    var Vehiclecollection = [Vehicle]()
}



class home{

    func addVehicleOne(){

        Vehicle1 = Vehicle(name: "Bus", location: "Delhi", price: "25.5", owner: "Bean")
        var VehicleInfo = GlobalArray.shared.collectionArray
        VehicleInfo.append(Vehicle1)


    }
}

class addVehicle{

    func addVehicleTwo(){
        Vehicle2 = Vehicle(name: "car", location: "mumbai", price: "2.5", owner: "sean")
        var VehicleInfo = GlobalArray.shared.collectionArray
        VehicleInfo.append(Vehicle2)
        addVehicleThree()
    }
    func addVehicleThree(){
        Vehicle3 = Vehicle(name: "bike", location: "bangalore", price: "1.0", owner: "mark")
        var VehicleInfo = GlobalArray.shared.collectionArray
        VehicleInfo.append(Vehicle3)

        print("vehicles are \(VehicleInfo)")

    }
}

当我运行代码时，我得到的结果是：

vehicles are Vehicle(name: "bike", location: "bangalore", price: "1.0", owner: "mark")

为什么我没有获得数组中的所有数据？为什么我只获取到最后一个附加的数据？请告诉我我做错了什么。

- Manas Nayak

---

数组是值类型。var VehicleInfo = GlobalArray.shared.collectionArray会创建一个数组的副本。你只能向该副本添加元素。 - Martin R

是的，我现在明白了。谢谢Martin。感谢您的回复。 - Manas Nayak

Answer 1

您正在引用全局数组并向其添加内容，需要将其设置回去：

var VehicleInfo = GlobalArray.shared.collectionArray
VehicleInfo.append(Vehicle3)
GlobalArray.shared.collectionArray = VehicleInfo

或者简单地执行：

GlobalArray.shared.collectionArray.append(Vehicle3)

- Frankenstein