title: iOS hides statusBar from child View Controller
body: <p>I have a viewController B class with xib file, and I add this viewController to the parent view A controller with this in my child.</p>
  
  <pre><code>[Acontroller addChildViewController:self]; // self is B
  [Acontroller.view addSubview:self.view];
  </code></pre>
  
  <p>What I want is, when the B viewController is displayed, hide the status Bar off the app.</p>
  
  <p>If I use in the A Controller :</p>
  
  <pre><code>-(BOOL)preferStatusBarHidden {
  
  return YES;
  
  }
  </code></pre>
  
  <p>the status bar is hidden, but I want to do that only from the B controller but it's not working.</p>
  
  <p>What can I do ? </p>
  
  <p>Thanks.</p>
  
  <pre><code>View Controller B :
  
  //
  //  AppehourInterstitielAds.m
  //  AppTestSdk
  //
  //  Created by Administrateur on 22/01/2014.
  //  Copyright (c) 2014 R. All rights reserved.
  //
  
  #import "AppehourInterstitielAds.h"
  #import "AppehourSdk.h"
  
  @interface AppehourInterstitielAds ()
  
  @end
  
  @implementation AppehourInterstitielAds
  
  - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
  {
      self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
      if (self) {
          // Custom initialization
      }
      return self;
  }
  
  -(id)initWithViewController:(UIViewController*)controller;{
  
  
  
      if (![AppehourSdk isNetworkConnected]){
  
          return nil;
      }
  
  
      self = [super init];
      vController = controller ;
  
  
      //------ Chargement des différents layouts selon taille écran
  
      // iPAD
      if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
  
         self.view =  [[NSBundle mainBundle]loadNibNamed:@"interstitielAdsIPad" owner:self options:nil][0];
      }
      //iPhone
      else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone){
          CGSize size = [[UIScreen mainScreen]bounds].size;
  
          //iphone 3.5"
          if (size.height == 480){
  
              self.view =  [[NSBundle mainBundle]loadNibNamed:@"interstitielAdsIPhone3.5" owner:self options:nil][0];
  
          }
          //iphone 4"
          else {
  
              self.view =  [[NSBundle mainBundle]loadNibNamed:@"interstitielAdsIPhone4" owner:self options:nil][0];
  
          }   
      }
  
      //------------- Construction requête
  
  
      if ([[AppehourSdk getDeviceId]isEqualToString:NSLocalizedStringFromTable(@"device_debug_id", @"appehourValues", nil)]){
  
          NSLog(@"is debug device");
          isDebugDevice = @"true";
      }
      else {
  
          isDebugDevice = @"false" ;
      }
  
      frame = self.webViewInterst.frame ;
  
      width = [NSString stringWithFormat:@"%d", (int)frame.size.width];
      height = [NSString stringWithFormat:@"%d", (int)frame.size.height];
  
      NSLog(@"ads interstitiel width: %@", width ) ;
      NSLog(@"ads interstitiel height: %@", height ) ;
  
  
      NSError *error;
  
      NSMutableDictionary *dictionnaryDatas  = [[NSMutableDictionary alloc]init];
      NSMutableDictionary *dictionnaryDatasAds  = [[NSMutableDictionary alloc]init];
  
  
      [dictionnaryDatasAds setObject:width forKey:@"width"];
      [dictionnaryDatasAds setObject:height forKey:@"height"];
      [dictionnaryDatasAds setObject:@"interstitiel" forKey:@"type"];
      [dictionnaryDatasAds setObject:[AppehourSdk getDeviceId] forKey:@"device_id"];
      [dictionnaryDatasAds setObject:[AppehourSdk getAppId] forKey:@"app_id"];
      [dictionnaryDatasAds setObject:isDebugDevice forKey:@"is_debug_device"];
  
  
      // conversion en json
      NSData *datas = [NSJSONSerialization dataWithJSONObject:dictionnaryDatasAds options:0 error: &amp;error];
  
  
      // url datas
      [dictionnaryDatas setObject:NSLocalizedStringFromTable(@"campaign_id", @"appehourValues", nil) forKey:@"cid"];
      [dictionnaryDatas setObject:@"ads" forKey:@"cat"];
      //ajout du json dans data
      [dictionnaryDatas setObject:datas forKey:@"data"];
  
      NSData *datasToSend = [NSKeyedArchiver archivedDataWithRootObject:dictionnaryDatas];
  
      NSURL *nsUrl = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@%@", @"http://",TAG_DOMAIN,@"/scripts/cpi.php" ]];
      NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:nsUrl];
  
  
      [request setHTTPMethod:@"POST"];
      // ajout des datas a la requete
      [request setHTTPBody:datasToSend];
  
      // Create url connection and fire request
      NSURLConnection *connectionGetAds = [[NSURLConnection alloc] initWithRequest:request delegate:self];
  
  
      //--------------- End build request----------------------
  
     // [vController addChildViewController:self]; // ajout du childViewController au controller principal
      [vController addChildViewController:self];
  
      self.webViewInterst.scrollView.scrollEnabled = NO; // désactiver scroll dans webView
  
      self.webViewInterst.delegate = self ; // call the webView methods
  
  
      return nil;
  
  }
  
  - (void)viewDidLoad
  {
      [super viewDidLoad];
  
      [[UIApplication sharedApplication]setStatusBarHidden:YES];
  
  
  
  }
  
  
  - (void)didReceiveMemoryWarning
  {
      [super didReceiveMemoryWarning];
      // Dispose of any resources that can be recreated.
  }
  
  - (IBAction)buttonClose:(id)sender {
  
  
      [self.view removeFromSuperview];
      [self removeFromParentViewController];
      [timer invalidate];
  
  
  }
  
  -(void)decrement {
  
      if (seconds == 0){
  
          [self.view removeFromSuperview];
          [self removeFromParentViewController];
          [timer invalidate];
  
      }else {
  
          seconds--;
          _secondsRemain.text = [NSString stringWithFormat:@"%d%@", seconds, @" seconds remaining"];
          timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(decrement) userInfo:nil repeats:NO];
  
      }
  
  }
  
  - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSHTTPURLResponse *)response {
  
      NSLog(@"response code interstitiel : %d", [response statusCode]);
  
  }
  
  - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
  
      //[responseDatas appendData:data] ;
  
  }
  
  -(void)connectionDidFinishLoading:(NSURLConnection*)connection {
  
      NSError *error;
  
      //dictAds = [NSJSONSerialization JSONObjectWithData:responseDatas options:NSJSONReadingMutableLeaves error:&amp;error];
  
      //----- TEMPORAIRE
  
      NSMutableDictionary *tempDict = [[NSMutableDictionary alloc]init];
  
      [tempDict setObject:@"1245" forKey:@"id"];
      [tempDict setObject:@"https://associate.w3i.com/Images/integration/ios-NR-I-portrait.png" forKey:@"url"];
      [tempDict setObject:@"interstitiel" forKey:@"type"];
      [tempDict setObject:@"tok" forKey:@"token"];
      [tempDict setObject:@"clic" forKey:@"rem"];
      [tempDict setObject:@"10" forKey:@"valid_delay"];
  
  
      //----------
  
      NSURL *url = [NSURL URLWithString:[tempDict objectForKey:@"url"]];
      NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
  
      [self.webViewInterst loadRequest:requestObj];
  
      seconds = [[tempDict objectForKey:@"valid_delay"] intValue] ; // seconds before close ads
  
      [NSThread sleepForTimeInterval:3]; // wait before display the view
  
      [vController.view addSubview:self.view];
  
  }
  
  // webVew finis chargement
  -(void)webViewDidFinishLoad:(UIWebView *)webView {
  
  
  
      [vController.view addSubview:self.view]; // ajoute la vue
      [self decrement];
  
      [self prefersStatusBarHidden];
      [vController prefersStatusBarHidden];
  
  }
  
  @end
  </code></pre>
  
  <p>View A :</p>
  
  <pre><code>//
  //  ViewController.m
  //  AppTestSdk
  //
  //  Created by Administrateur on 09/01/2014.
  //  Copyright (c) 2014 R. All rights reserved.
  //
  
  #import "ViewController.h"
  #import "AppehourInterstitielAds.h"
  
  @interface ViewController (){
  
  
      AppehourSdk* appehour;
      AppehourInterstitielAds *ads ;
  
  
  }
  
  @end
  
  @implementation ViewController
  
  
  
  -(void)didReceiveMemoryWarning
  {
   [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
  }
  
  #pragma mark - View lifecycle
  
  - (void)viewDidLoad
  {
      [super viewDidLoad];
  
      [_appehourAds initAds:[AppehourSdk getDeviceId]];
      [[UIApplication sharedApplication]setStatusBarHidden:NO];
  
  }
  
  - (void)viewWillAppear:(BOOL)animated
  {
       [super viewWillAppear:animated];
  
  }
  
  - (void)viewDidAppear:(BOOL)animated
  {
        [super viewDidAppear:animated];
    }
  
  - (void)viewWillDisappear:(BOOL)animated
  {
    [super viewWillDisappear:animated];
  }
  
  - (void)viewDidDisappear:(BOOL)animated
  {
   [super viewDidDisappear:animated];
  }
  
  - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
  {
   // Return YES for supported orientations
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
    }
  
  - (IBAction)button:(id)sender {
  
      /*
      UILocalNotification *notifcation = [[UILocalNotification alloc]init];
      notifcation.alertBody = @"Contenu";
      notifcation.fireDate = [NSDate dateWithTimeIntervalSinceNow:5];
  */
  
      ads = [[AppehourInterstitielAds alloc]initWithViewController:self];
  
  
      NSString *lemessage = [[NSString alloc] initWithFormat:@"Button clicked !"];
      _labelText.text = lemessage;
      NSLog(@"Button clicked");
  
  
      NSMutableDictionary *dictionnary = [[NSMutableDictionary alloc]init];
      [dictionnary setObject:@"value" forKey:@"key"];
  
      appehour = [[AppehourSdk alloc]init];
  
      [appehour trackEvent:@"Track" :dictionnary :@"8656"];
  
  
  }
  
  
  @end
  </code></pre>