sampleBox.m

-(void)viewDidAppear:(BOOL)animated{
  self.box = [[CRBox alloc] initWithClientId:@"" clientSecret:@""];
  NSString * restored_state = [NSUserDefaults.standardUserDefaults objectForKey:@"box_state"];

  if (restored_state != nil ) {
    [self.box loadAsString:restored_state];
    NSString * userName = [self.box userName];
    NSString * userLogin = [self.box userLogin];
    NSLog(@"%@ - %@", userName, userLogin);


    NSString * string = [self.box saveAsString];
    NSLog(@"%@", string);
    [NSUserDefaults.standardUserDefaults setObject:string forKey:@"box_state"];

  }else {
    [self.box login];

    NSString * string = [self.box saveAsString];
    NSLog(@"%@", string);
    [NSUserDefaults.standardUserDefaults setObject:string forKey:@"box_state"];
  }