The storyboard version of Quiz - ios

Question

Referring to the iOS Programming: The Big Nerd Ranch Guide first test project Quiz, but it use NIB file instead of storyboard nowadays. So I try to make it by myself.
Following this book's code and then run it into simulator, the screen will show nothing for it.
// ViewController.m
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic) int currentQuestionIndex;
#property (nonatomic, copy) NSArray *questions;
#property (nonatomic, copy) NSArray *answers;
#property (nonatomic, weak) IBOutlet UILabel *questionLabel;
#property (nonatomic, weak) IBOutlet UILabel *answerLabel;
#end
#implementation ViewController
- (id) initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
// Call the init method implemented by the superclass
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// create two arrays filled with questions and answers
// and make the pointers point to them
self.questions = #[#"From what is cognac made?",
#"What is 7+7?",
#"What is the capital of Vermont?"];
self.answers = #[#"Grapes",
#"14",
#"Montpelier"];
}
// Return the address of the new object
return self;
}
- (IBAction)showQuestion:(id)sender
{
// Step to the next question
self.currentQuestionIndex++;
// Am I past the last question?
if (self.currentQuestionIndex == [self.questions count]) {
// Go back to the first question
self.currentQuestionIndex = 0;
}
// Get the string at that index in the questions array
NSString *question = self.questions[self.currentQuestionIndex];
// Display the string in the question label
self.questionLabel.text = question;
// Reset the answer label
self.answerLabel.text = #"???";
}
- (IBAction)showAnswer:(id)sender
{
// What is the answer to the current question?
NSString *answer = self.answers[self.currentQuestionIndex];
// Display it in the answer label
self.answerLabel.text = answer;
}
#end
// AppDelegate.m
#import "AppDelegate.h"
#import "ViewController.h"
#interface AppDelegate ()
#end
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch
ViewController *quizVC = [[ViewController alloc] init];
self.window.rootViewController = quizVC;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
#end
I think the storyboard is make something different from NIB file, so if I want achieve the version of storyboard, how should I do into this code.
I have successfully did all the other things about this project.
Other information of this Quiz project.

Answer 1

In AppDelegate class, load the ViewController with initWithNibName,
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch
ViewController *quizVC = [[ViewController alloc] initWithNibName:#"YourNIBFileName" bundle:nil];
self.window.rootViewController = quizVC;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}