Swift：按函数值对对象进行排序

Question

我正在尝试通过其中一个函数/方法的返回值对一组对象进行排序。我的班级如下：

class Shift{
var Name: String

var Deliveries: [Delivery] = []
var SalesPercentage: Double = 0.0
var LabelForecast: Double = 0.0
var PromotionModsChanging: Double = 0.0

var ShortName: String{
    get{
        return Name[0...2]
    }
}

init(Name: String){
    self.Name = Name
}

func getSales() -> Double{
    return (SalesPercentage / 100) * Settings.ExpectedWeeklySales
}

func totalWeight() -> Double{
    var total: Double = 0.0

    // Add total Deliveries Weight
    for delivery: Delivery in Deliveries{
        total = total + delivery.DeliveryWeight()
    }

    // Add Sales Weight
    total = total + (getSales() * 0.2)

    // Add labels Weight measured at 100 labels per hour
    total = total + (LabelForecast * 0.6)

    // Add Promotion Mods Changing measured at 45 Minutes per mod. Ladder racks and grocery shelving should be classed as 0.5 mods each.
    total = total + (PromotionModsChanging * 45)

    return total
}


}

它们存储的数组如下：

var Shifts: [Shift] = []

然后我将 Shift 对象附加到其中。然后我试图找到一种方法，通过 totalWeight() 函数的返回值来组织 Shifts 数组。有人可以帮忙吗？

Answer 1

以下将Shifts 的数组按升序排序：

let sorted = shifts.sorted { $0.totalWeight() < $1.totalWeight() }

或者，不是创建一个新数组并将已排序的shifts 分配给该数组；你可以像这样对shifts 进行排序：

shifts.sort { $0.totalWeight() < $1.totalWeight() }

请记住，上面的代码只有在您将 shifts 声明为变量时才会起作用。