arrays - 使用嵌套元组对数组进行排序

Question

我正在创建包含以下元素的前 5 名排行榜:

Player Name

Completion Time (how long it took to complete the game)

Total Moves

Date Stamp

为此，我创建了一个包含嵌套元组的元组数组来跟踪分、秒和毫秒，如下所示:

var leaderBoard: [(playerName: String, completionTime: (minutes: Int, seconds: Int, miliseconds: Int), totalMoves: Int, dateStamp: Date)] = []

游戏完成后，这些值将附加到数组，直到它总共包含 5 个元素。

我的麻烦是我需要按完成时间升序对这个数组进行排序。由于此数组中元组的复杂嵌套性质，我似乎无法找到实现此目的的有效方法。如有任何帮助，我们将不胜感激。

Answer 1

如果您的 completionTime格式正确( seconds 在 0...59 中， milliseconds 在 0...999 中)，那么您可以对 leaderboard 进行排序与:

leaderBoard.sort { $0.completionTime < $1.completionTime }

---

这是有效的，因为 Swift 可以比较 2 个元组 (1, 2, 3)和 (1, 2, 4)与 <它将比较第一项，如果它们相等，它将比较第二项，如果它们相等，它将比较第三项。所以你可以用一个简单的 < 来订购它们比较。即使项目被标记，只要两个元组具有相同数量的元素，元素数量不超过 6，并且相应元素的类型匹配，这也是有效的。

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示例:

var leaderBoard: [(playerName: String, completionTime: (minutes: Int, seconds: Int, milliseconds: Int), totalMoves: Int, dateStamp: Date)] = [
    (playerName: "Fred", completionTime: (minutes: 4, seconds: 10, milliseconds: 800), totalMoves: 3, dateStamp: Date()),
    (playerName: "Barney", completionTime: (minutes: 5, seconds: 10, milliseconds: 800), totalMoves: 3, dateStamp: Date()),
    (playerName: "Wilma", completionTime: (minutes: 4, seconds: 10, milliseconds: 801), totalMoves: 3, dateStamp: Date()),
    (playerName: "Bam Bam", completionTime: (minutes: 1, seconds: 10, milliseconds: 0), totalMoves: 3, dateStamp: Date()),
    (playerName: "Pebbles", completionTime: (minutes: 4, seconds: 10, milliseconds: 799), totalMoves: 3, dateStamp: Date())
]

leaderBoard.sort { $0.completionTime < $1.completionTime }
leaderBoard.forEach { print($0) }

输出:

(playerName: "Bam Bam", completionTime: (minutes: 1, seconds: 10, milliseconds: 0), totalMoves: 3, dateStamp: 2018-09-21 11:17:36 +0000)
(playerName: "Pebbles", completionTime: (minutes: 4, seconds: 10, milliseconds: 799), totalMoves: 3, dateStamp: 2018-09-21 11:17:36 +0000)
(playerName: "Fred", completionTime: (minutes: 4, seconds: 10, milliseconds: 800), totalMoves: 3, dateStamp: 2018-09-21 11:17:36 +0000)
(playerName: "Wilma", completionTime: (minutes: 4, seconds: 10, milliseconds: 801), totalMoves: 3, dateStamp: 2018-09-21 11:17:36 +0000)
(playerName: "Barney", completionTime: (minutes: 5, seconds: 10, milliseconds: 800), totalMoves: 3, dateStamp: 2018-09-21 11:17:36 +0000)