如何在swift 3中通过自定义状态值对自定义对象数组进行排序？

Question

假设我们有一个名为 orderFile 的自定义类，这个类包含三个属性。

class orderFile  {
    var name = String()
    var id = Int()
    var status = String()
}

很多都存储在一个数组中

var aOrders : Array = []

var aOrder = orderFile()
aOrder.name = "Order 1"
aOrder.id = 101
aOrder.status = "closed"
aOrders.append(aOrder)

var aOrder = orderFile()
aOrder.name = "Order 2"
aOrder.id = 101
aOrder.status = "open"
aOrders.append(aOrder)

var aOrder = orderFile()
aOrder.name = "Order 2"
aOrder.id = 101
aOrder.status = "cancelled"
aOrders.append(aOrder)

var aOrder = orderFile()
aOrder.name = "Order 2"
aOrder.id = 101
aOrder.status = "confirmed" 
aOrders.append(aOrder)

问题是：我将如何根据打开、确认、关闭和取消的状态对它们进行排序？

Answer 1

您必须提供一个值，以便在排序函数中进行比较时会产生适当的排序。

例如：

extension orderFile
{    
    var statusSortOrder: Int 
        { return ["open","confirmed","closed","cancelled"].index(of: status) ?? 0 }
}

let sortedOrders = aOrders.sorted{$0.statusSortOrder < $1. statusSortOrder}