如何在Swift中从字符串中删除重复的字符

编辑/更新： Swift 4.2或更高版本

您可以使用一组来过滤重复的字符：

let str = "bookkeeper"var set = Set<Character>()let squeezed = str.filter{ set.insert($0).inserted }print(squeezed)   //  "bokepr"

或作为扩展，

RangeReplaceableCollection

extension RangeReplaceableCollection where Element: Hashable {    var squeezed: Self {        var set = Set<Element>()        return filter{ set.insert($0).inserted }    }}

let str = "bookkeeper"print(str.squeezed)      //  "bokepr"print(str[...].squeezed) //  "bokepr"