let strings = "点击跳转测试\r\r\n点击跳转测试\n<<<<<https://mp.youkuaiyun.com/postedit>>>>>点击跳转测试,点击跳转测试"
有这样一段文字,要求给<<<<<。。。。 >>>>>之间的文字变色 添加点击链接跳转到新的画面
let strings1 = strings.replacingOccurrences(of: "\r", with: "r") ///替换\r以获取"<<<<<"正确的起始下标
let index1 = strings1.positionOF(sub: "<<<<<") /// "<<<<<"的起始下标
let index2 = strings1.positionOF(sub: ">>>>>") /// ">>>>>"的起始下标
/// 创建富文本字符串
let attriStr : NSMutableAttributedString = NSMutableAttributedString.init(string: strings)
/// 给<<<<< >>>>>之间的文字添加变色和点击链接
attriStr.addAttribut