使用AFNetworking請求數(shù)據(jù)如果網(wǎng)頁的數(shù)據(jù)是gbk類型的話，用UTF8轉(zhuǎn)換的話，結(jié)果會是nil，這個時候我們需要用gbk編碼做轉(zhuǎn)換，將我們通過網(wǎng)絡(luò)請求獲得的NSData數(shù)據(jù)進(jìn)行如下轉(zhuǎn)化：

        //GBK編碼
          NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
        NSString * encodeStr = [[NSString alloc] initWithBytes:[resultdata bytes] length:[resultdata length] encoding:enc];

如果沒有成功，需要寫上這幾句代碼：

AFHTTPSessionManager * manager = [AFHTTPSessionManager manager]；
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];

swift的寫法如下

  //GBK編碼
            let enc = CFStringConvertEncodingToNSStringEncoding(UInt32(CFStringEncodings.GB_18030_2000.rawValue))
            let string : String = NSString(data: responseObj as! Data, encoding: enc) as! String
           var result:String = string.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)

如果沒有成功和oc一樣需要設(shè)置下manager的responseSerializer和requestSerializer