IOS Swift中GBK编码转换

import Foundation

extension String {

    init?(gbkData: Data) {

        //获取GBK编码, 使用GB18030是因为它向下兼容GBK

        let cfEncoding = CFStringEncodings.GB_18030_2000

        let encoding = CFStringConvertEncodingToNSStringEncoding(CFStringEncoding(cfEncoding.rawValue))

        //从GBK编码的Data里初始化NSString, 返回的NSString是UTF-16编码

        if let str = NSString(data: gbkData, encoding: encoding) {

            self = str as String

        } else {

            return nil

        }

    }

    

    var gbkData: Data {

        let cfEncoding = CFStringEncodings.GB_18030_2000

        let encoding = CFStringConvertEncodingToNSStringEncoding(CFStringEncoding(cfEncoding.rawValue))

        let gbkData = (self as NSString).data(using: encoding)!

        return gbkData

    }

    

}

var str = “中国加油”

print(str.gbkData.count)