arrays - Swift:按函数值对对象排序

Question

我正在尝试根据其中一个函数/方法的返回值对对象数组进行排序。我的类(class)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来通过 totalWeight() 函数的返回值来组织 Shifts 数组。谁能帮忙？

Answer 1

以下将对 Shift 的数组进行升序排序:

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

或者，不是创建一个新数组并将排序后的 shifts 分配给它；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 声明为变量时才有效。