我编写符合协议Comparable的以下Struct. struct Record: Comparable { static func (lhs: Record, rhs: Record) - Bool { if lhs.wins == rhs.wins { return lhs.losses rhs.losses } return lhs.wins rhs.wins } var wins: Int var losses: Int in
struct Record: Comparable { static func < (lhs: Record, rhs: Record) -> Bool { if lhs.wins == rhs.wins { return lhs.losses > rhs.losses } return lhs.wins < rhs.wins } var wins: Int var losses: Int init(wins: Int, losses: Int) { self.wins = wins self.losses = losses } } var a1 = Record(wins: 3, losses: 8) var b1 = Record(wins: 3, losses: 9) var c1 = Record(wins: 4, losses: 7) var records = [a1, b1, c1] records.reverse() print(records)
使用>一切正常< ==并排序.但如果我在记录数组上反转sort方法,它给我输出如下:
[__lldb_expr_48.Record(wins: 4, losses: 7), __lldb_expr_48.Record(wins: 3, losses: 9), __lldb_expr_48.Record(wins: 3, losses: 8)]
应该先取得最高胜利,然后取得较少的胜利,但如果胜利相等,那么在损失增加之前应该减少损失.我在这里做错了什么或遗漏了什么?我仍然学得很快,所以可能.
要按反向排序顺序排序一系列东西,您可以按>排序:records.sort(by: >)
反向将只是反转数组,而不进行排序.