Question

我目前正在创建一个使用＆＃34;定时奖励＆＃34;只持续一段特定时间，我在Swift中使用过滤器的新手，我需要满足的当前目标：

如果redemptionDate为NULL，则显示奖励
如果currentDateTime＆gt; = redemptiondate + redeemTimeLimit（这些是JSON对象），则隐藏奖励
如果currentDateTime＆lt;显示奖励并显示倒数计时器redemptiondate + redeemTimeLimit
倒计时器金额是redemptiondate + redeemTimeLimit和currentDateTime之间的差异

到目前为止，这是我的代码，我遇到了几次崩溃，这些注释都在代码中。我也编号了我尝试并符合上述标准的区域：

   var rewardsArray : [MemberRewardsInfo] = []//MemberRewarsInfo is a JSON Object custom class
  var timeFilteredRewardsArray : [MemberRewardsInfo] = []

 RewardManager.sharedInstance.updateRewards({ rewards in

self.timeFilteredRewardsArray = rewards


  //.1
  self.timeFilteredRewardsArray = self.timeFilteredRewardsArray.filter ({$0.redemptionDate == nil})


for filteredReward in self.timeFilteredRewardsArray {


  let Date = NSDate()
  let df = NSDateFormatter()
  df.timeZone = NSTimeZone(forSecondsFromGMT: 0)
  df.dateFormat = "MM-dd-yyyy"
  let currentDate = df.stringFromDate(Date)

  //.2
  if currentDate >= filteredReward.redemptionDate! + filteredReward.redeemTimeLimit! {

            //remove current reward from array, not sure how to do this

    //.3
  } else if currentDate < filteredReward.redemptionDate! + filteredReward.redeemTimeLimit!{

    //.4
    var countdownTimer = (filteredReward.redemptionDate! + filteredReward.redeemTimeLimit!) - currentDate

       //error occurs here: "Binary operator '-' cannot be applied to two 'String' operands"
  }
}



   self.rewardsArray =  self.timeFilteredRewardsArray
    self.rewardsTableView.reloadData()

  })

Answer 1

我建议您使用此库SwiftyJSON。 Swift对类型非常严格，JSON并不关心类型。此外，链接变得一团糟，SwiftyJSON修复了所有这些。它将帮助您专注于过滤器，因为您正在过滤数组，然后将其分配给相同的数组...

快速举例，因为我不知道你的json结构：

let json = JSON(data: dataFromNetworking)
if let userName = json[0]["data"]["date"].string {
  //convert to date and do your filters
}

如何过滤JSON数据然后枚举过滤后的数据？

1 个答案: