如何使用 DateTime 键 (Swift 4) 对 NSDictionary 数组进行排序？

Question

我有一个 NSDictionary 的 NSArray

let Array = (
{ name = "Auni";
  age = "24";
  transactionTime = "01-02-2011 12:32:39" },
{ name = "Atiqah";
  age = "23";
  transactionTime = "02-02-2013 10:32:41" },
{ name = "Aida";
  age = "22";
  transactionTime = "04-02-2020 18:32:21"})

如何按最近的交易时间对这个数组进行排序？使用 Swift4.

谢谢。

编辑：让后端人员为您做这件事更容易。

Answer 1

不需要转成Date对象，dateStrings直接比较也可以。

array.sort { (dict1, dict2) -> Bool in

    /// Considering "transactionTime" key always exists.
    let transactionTime1 = dict1["transactionTime"]!
    let transactionTime2 = dict2["transactionTime"]!

    /// Sort in descending order
    return transactionTime1 > transactionTime2
}

如果您需要对日期对象进行一些计算，那么您还可以在运行时间将字符串转换为日期对象，如下例所示：

let df = DateFormatter()
df.dateFormat = "dd-MM-yyyy HH:mm:ss"
array.sort { (dict1, dict2) -> Bool in

    /// Considering "transactionTime" key always exists.
    let transactionTime1 = dict1["transactionTime"]!
    let transactionTime2 = dict2["transactionTime"]!

    let date1 = df.date(from: transactionTime1)!
    let date2 = df.date(from: transactionTime2)!

    /// Sort in descending order
    return date1 > date2
}

print(array)

输出

[["transactionTime": "04-02-2020 18:32:21", "name": "Aida", "age": "22"], ["transactionTime": "02-02-2013 10:32:41", "name": "Atiqah", "age": "23"], ["transactionTime": "01-02-2011 12:32:39", "name": "Auni", "age": "24"]]

如何使用 DateTime 键 (Swift 4) 对 NSDictionary 数组进行排序？

How to Sort an Array of NSDictionary using DateTime key (Swift 4)?

arrays

sorting

nsdictionary

swift