MyQuiz.m

... All of foundation's headers ...

@interface MyQuiz : NSObject
    @property (nonatomic, strong) NSMutableArray *quoteArray;
    -(id) initWithTheQuiz : (NSString *) plistName;
@end
@implementation MyQuiz
    -(id) initWithTheQuiz:(NSString *)plistName {
        self = [super init];
        if(self) {
            NSString *pathToResource = [[NSBundle mainBundle ] pathForResource: plistName ofType:@"plist"];
            NSMutableArray *quoteArray = [NSMutableArray arrayWithContentsOfFile:pathToResource];
        }
        return self;
    }
    

@end

QuoteQuizViewController.m

... All the UIKit headers ...

@class MyQuiz;
@interface QuoteQuizViewController : UIViewController
    @property (nonatomic, assign) NSInteger quizIndex;
    @property (nonatomic, strong) MyQuiz * quiz;

@end

@interface MyQuiz : NSObject
    @property (nonatomic, strong) NSMutableArray *quoteArray;
    -(id) initWithTheQuiz : (NSString *) plistName;
@end

@interface QuoteQuizViewController ()

@end

@implementation QuoteQuizViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.quizIndex = 999;
    self.quiz = [[MyQuiz alloc] initWithTheQuiz:@"quotes"];
  // Do any additional setup after loading the view, typically from a nib.
}

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

@end