1柴墩、清除兩端的數(shù)字
var string = "21 你 \n 好 323"
string = string.trimmingCharacters(in: CharacterSet.decimalDigits)
/// 按照CharacterSet清除兩側(cè)的特殊字符后返回一個(gè)字符串
/// public func trimmingCharacters(in set: CharacterSet) -> String
2、一次性清除多種特殊字符
var string1 = "21 你 \n 好 323"
var set = CharacterSet()
set.formUnion(.whitespacesAndNewlines)
set.formUnion(.decimalDigits)
let array = string1.components(separatedBy: set)
string1 = array.joined(separator: "")
/// 根據(jù)CharacterSet 分割成一個(gè)字符串?dāng)?shù)組
/// func components(separatedBy separator: CharacterSet) -> [String]
