过滤NSLog数据

Question

我想过滤NSLog以获取我需要的唯一信息。 我的NSLog给了我：

Birthday : 05/24/1993
Id : xxxxxx (number)

我想只保留05/24/1993，有什么解决方案吗？

我的代码是：

- (void)viewDidLoad
{
    [super viewDidLoad];
    FBRequest *friendRequest = [FBRequest requestForGraphPath:@"/me?fields=birthday"];
    [ friendRequest startWithCompletionHandler:^(FBRequestConnection *connection,id result, NSError *error) {
        [[NSUserDefaults standardUserDefaults]setObject:result forKey:@"birthdayDate"];
        self.birthdayArray=[[NSUserDefaults standardUserDefaults]objectForKey:@"birthdayDate"];

        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"birthdayDate contains[c] /"];
        self.birthday = [self.birthdayArray filteredArrayUsingPredicate:predicate];

        NSLog(@"BIRTHDAY : %@", self.birthday);

    }