ios device token: obective-c

obective-c device token

- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken {

    NSUInteger dataLength = deviceToken.length;
    const unsigned char *dataBuffer = (const unsigned char *)deviceToken.bytes;
    NSMutableString *hexString  = [NSMutableString stringWithCapacity:(dataLength * 2)];
    for (int i = 0; i < dataLength; ++i) {
         [hexString appendFormat:@"%02x", dataBuffer[i]];
    }
    let token = [hexString copy];
  
    //continue writing code .....
}