标签:写法 end div code dex pre 截取 art fse
截取某字符串的前10个字符串
let sub1 = str.prefix(10)
截取某字符串的后10个字符串
let str1 = str.suffix(10)
也可以换种写法
let index2 = str.index(str.endIndex, offsetBy: -10) let sub4 = str[index2..<str.endIndex]
截取某字符串的第3个字符到第6个字符范围的字符串
let index3 = str.index(str.startIndex, offsetBy: 3) let index4 = str.index(str.startIndex, offsetBy: 6) let sub4 = str[index3..<index4]
标签:写法 end div code dex pre 截取 art fse
原文地址:https://www.cnblogs.com/heyode/p/9149483.html