Swift對字符串的排序

主要是使用sorted函數,自己提供排序規則,或者自己重載< 或者 >

1.sorted對數組內的字符串升序

 

var name2 : [String] = ["Alice","Mike","Bob","May","Cake"]

name2 = name2.sorted({name1 , name2 in

    return name1.localizedStandardCompare(name2) == NSComparisonResult.OrderedAscending

})

name2

輸出結果:

["Alice", "Bob", "Cake", "May", "Mike"]

NSComparisonResult.OrderedDescending降序

2.重載 < 

var names : [String] = ["Alice","Mike","Bob","May","Cake"]
names = names.sorted({$0 < $1})

names

func < (lhs: String, rhs:String) -> Bool {
    return lhs.localizedStandardCompare(rhs) == NSComparisonResult.OrderedAscending
}

輸出:["Alice", "Bob", "Cake", "May", "Mike"]

也可以重載 > 降序,修改NSCompareResult即可.