iOS crystal ball app help

 //
//  ViewController.m
//  CrystalBall
//
//  Created by zac plett on 2/18/13.
//  Copyright (c) 2013 zac plett. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize predictionLabel;
@synthesize predictionArray;

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIImage *image = [UIImage imageNamed:@"background.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    [self.view addSubview:imageView];
     self.predictionArray = [[NSArray alloc] initWithObjects:@"It is certain",@"It is possible",@"I would say YES",

                                @"The stars are not aligned",
                                @"My reply is no",
                                @"It is doubtful",
                                @"Better not to tell you now",
                                @"Concentrate and ask again",
                                @"Unable to answer now", nil];


    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)buttonPressed:(UIButton *)sender {
    NSUInteger index = arc4random_uniform(self.predictionArray.count);
    self.predictionLabel.text = [self.predictionArray objectAtIndex:index];
}
@end

//
//  ViewController.h
//  CrystalBall
//
//  Created by zac plett on 2/18/13.
//  Copyright (c) 2013 zac plett. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController :
    UIViewController {
}


@property (strong, nonatomic) IBOutlet UILabel *predictionLabel;
@property (strong, nonatomic)NSArray *predictionArray;

- (IBAction)buttonPressed:(UIButton *)sender;


@end