1.字符串截取 (用时注意to和from)
后5位
let str: String = "12345678"
let end = str.index(str.endIndex, offsetBy: -5)
self.endTime = str.substring(from: end)
打印:45678
前2位
let end = str.index(str.startIndex, offsetBy: 3)
self.endTime = str.substring(to: end)
打印:123
2.获取字符串长度
let titleString : String = "title"
let count = titleString.characters.count
持续更新..
