Fun Facts app doesn't run the way it is suppose to

Question

I did everything like the instructor did in the video, but when i debug it, the label text doesn't change even though i wrote the code for it to change. When i press the "Show Another Fun Fact" button, it doesn't show another fun fact even though i coded it like the instructor. Also, nothing is changing on the main storyboard

View controller.h

#import <UIKit/UIKit.h>

@class FactBook;

@interface ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UILabel *funFactLabel;
@property (strong, nonatomic) FactBook *factBook;

@end

View controller.m

#import "ViewController.h"
#import "FactBook.h"

@interface ViewController ()
@end
@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];    
    self.factBook = [[FactBook alloc] init];
    self.funFactLabel = [self.factBook.facts objectAtIndex:0];
}

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

- (IBAction)showFunFact {
    self.funFactLabel.text = [self.factBook.facts objectAtIndex:1];
}
@end

FactBook.h

#import <Foundation/Foundation.h>

@interface FactBook : NSObject

@property (strong, nonatomic) NSArray *facts;

@end

FactBook.m

#import "FactBook.h"

@implementation FactBook

- (instancetype)init
{
    self = [super init];
    if (self) {
        _facts = [[NSArray alloc] initWithObjects:
                  @"Ants stretch when they wake up",
                  @"Ostriches can run faster than horses",
                  @"Olympic gold medals are actually made mostly of silver.",
                  @"You are born with 300 bones; by the time you are an adult you will have 206.",
                  @"It takes about 8 minutes for light from the Sun to reach Earth.",
                  @"Some bamboo plants can grow almost a meter in just one day.",
                  @"The state of Florida is bigger than England.",
                  @"Some penguins can leap 2-3 meters out of the water.",
                  @"On average, it takes 66 days to form a new habit.",
                  @"Mammoths still walked the Earth when the Great Pyramid was being built.",nil];

    }
    return self;
}

@end

Please help, thank you

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Cary Huang

Cary Huang

Fun Facts app doesn't run the way it is suppose to