First ios application giving blank white screen - ios

Question

I am getting black screen when i initially run on my iphone.When i disconnect my iphone from my mac and open the applications a plain white screen opens.Please Help.
BNRQuizTableViewController.h
#import <UIKit/UIKit.h>
#import "BNRQuizTableViewController.h"
#interface BNRQuizTableViewController : UITableViewController
#end
BNRQuizTableViewController.m
#import "BNRQuizTableViewController.h"
#interface BNRQuizTableViewController ()
#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 BNRQuizTableViewController
-(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;
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;
}
}
- (instancetype)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 = #[#"What is the name of the first prophet?",
#"What is the name of the last prophet",
#"Who was the first caliph ?"];
self.answers = #[#"Prophet Adam(A.S)",
#"Propher Mohammed(S.A.W)",
#"Hazrat Abu bakar"];
}
// Return the address of the new object
return self;
}
#end;
BNRAppDelegate.h
#import <UIKit/UIKit.h>
#interface BNRAppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#end
BNRAppdelegate.m
#import "BNRAppDelegate.h"
#import "BNRQuizTableViewController.h"
#implementation BNRAppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
BNRQuizTableViewController *quizvc = [[BNRQuizTableViewController alloc]init];
self.window.rootViewController=quizvc;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
#end

Answer 1

You need to specify the nib name for your view controller with initWithNibName:bundle: otherwise the view controller will have no valid view assigned:
BNRQuizTableViewController *quizvc = [[BNRQuizTableViewController alloc] initWithNibName#"YOUR_NIB_NAME_HERE" bundle:[NSBundle mainBundle]];