iOS using nsstring from class in UIViewController

I've been bashing my head against this for a week solid, I'm sure its been answered before but in all my research i'm just confusing myself more and more.

I'm just simply trying to use an NSString from a class (BBDate) in a UILabel in my main UIViewController.

BBDate.h

#import <Foundation/Foundation.h>
@interface BBDate : NSObject {
  NSString *dateString;
}
@property (nonatomic, retain) NSString *dateString;
@end

BBDate.m

//just a simple date creation and formatting to try to learn this technique
#import "BBDate.h"
@implementation BBDate  
@synthesize  dateString;

- (void)createDate; {
NSDate* date = [NSDate date];
//Create the dateformatter object
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
//Set the required date format
[formatter setDateFormat:@"MM-dd-yyyy"];
//Get the string date
NSString *string = [formatter stringFromDate:date];
//Display on the console
    NSLog (@"%@",string); 
    //set variable
   dateString = string;
   }
   @end

UIViewController.h

#import <UIKit/UIKit.h>
#import "BBDate.h"

@interface BBFirstViewController : UIViewController {

UILabel *dateToday;
BBDate *bbDate;
}
@property (nonatomic, retain) IBOutlet UILabel *dateToday;
@property (nonatomic, retain) BBDate *bbDate;
@end

UIViewController.m

#import "BBFirstViewController.h"
#import "BBDate.h"
@implementation BBFirstViewController
@synthesize dateToday, bbDate;
...
//for testing i'm ju开发者_如何学Gost using viewdidload
- (void)viewDidLoad {
[super viewDidLoad];
dateToday.text = bbDate.dateString;
NSLog(@"%@", bbDate.dateString);
...

You need to initialize bbDate for one thing and create a date:

bbDate = [[BBDate alloc] init];
[bbDate createDate];

Put that before:

dateToday.text = bbDate.dateString;

Also:

- (void)createDate; {

Get rid of the semicolon:

- (void)createDate {

In your createDate method:

dateString = string;

Should be:

self.dateString = string;

Plus you probably are not going to need the NSDateFormatter outside your method so at the end of it say:

[formatter release];