Swift 3类jsonArray

Question

请告诉我如何根据"BonusCard“值对"bonusCardsArray”中的"currentPoints“多个数组进行排序(降序、升序)。

//Array to sort according to "currentPoints" 
var bonusCardsArray = [BonusCard]()

//basis class
class BonusCard {

  var companyName             : String
  var bonusCardDescription    : String
  var currentPoints           : Int
  var bonusCardType           : Int


  init(companyName: String, bonusCardDescription: String,    
  currentPoints: Int, bonusCardType: Int) {

      self.companyName = companyName
      self.bonusCardDescription = bonusCardDescription
      self.currentPoints = currentPoints
      self.bonusCardType = bonusCardType
  }
}

Answer 1

排序在适当的位置(升序w.r.t. )(到currentPoints属性)，使用 method

bonusCardsArray.sort { $0.currentPoints < $1.currentPoints }

或者，创建一个新数组；原始数组的排序版本使用 method

let sortedfBonusCardsArray = bonusCardsArray
    .sorted { $0.currentPoints < $1.currentPoints }

Answer 2

您应该编写以下代码。

• 降 bonusCardsArray.sorted({ 0美元)currentPoints >$1.currentPoints })
• 为升天 bonusCardsArray.sorted({ 0美元)currentPoints <$1.currentPoints })