title: Sending data from one ViewController to another.
body: <p>I have got two ViewController:<br></p>
  
  <p>1) <strong>ViewController</strong> <br></p>
  
  <p>2) <strong>TestAppViewController</strong></p>
  
  <p>In <code>ViewController.h</code>, I define a label, whose text I want to be sent from second viewController, i.e `TestAppViewController.</p>
  
  <p>For this I defined a <code>@property NSString *</code> in <strong>ViewController.h</strong>, and created an object of this ViewController in my second Controller. 
  Then passed a value to this property, but ans is still coming nil.</p>
  
  <p>Following is my code :</p>
  
  <pre><code>@property (nonatomic, retain) NSString *lableName;*
  </code></pre>
  
  <p><strong>ViewController</strong></p>
  
  <pre><code>#import "ViewController.h
  #import "TestAppView1.h"
  #import "TestAppViewController2.h"
  
  @interface ViewController ()
  
  @end
  
  @implementation ViewController
  
  - (void)viewDidLoad
  {
      [super viewDidLoad];
      // Do any additional setup after loading the view, typically from a nib.
      //    [self addView1];
  }
  
  - (void)viewWillAppear:(BOOL)animated
  { 
      [self addView1];
  
      NSLog(@"Label name is %@",self.lableName);
  }    
  
  - (void)didReceiveMemoryWarning
  {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
  }
  
  - (void)addView1
  {
      TestAppView1 *testAppView1Obj = [ [TestAppView1 alloc]        initWithFrame:self.view.bounds];
  
      [testAppView1Obj setDelegate:self];
      [testAppView1Obj setSelectorOnButtonTapped:@selector(buttonTapped)];
  
      [self.view addSubview:testAppView1Obj];
  }
  
   -(void)buttonTapped
   {
  
      TestAppViewController2 *testAppViewController2Obj =[[TestAppViewController2    alloc]initWithNibName:@"TestAppViewController2" bundle:nil];
  
      [self.navigationController pushViewController:testAppViewController2Obj animated:YES];
   }
  
   @end
  </code></pre>
  
  <p><strong>ViewController2</strong></p>
  
  <pre><code>#import "TestAppViewController2.h"
  #import "TestAppView2.h"
  #import "ViewController.h"
  
  @interface TestAppViewController2 ()
  
  @end
  
  @implementation TestAppViewController2
  
  - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
  {
      self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
      if (self) {
          // Custom initialization
      }
      return self;
  }
  
  -(void)viewWillAppear:(BOOL)animated
  {
      [self addView2];
  }
  
  - (void)viewDidLoad
  {
      [super viewDidLoad];
      // Do any additional setup after loading the view.
  }
  
  
  
  - (void)didReceiveMemoryWarning
  {
      [super didReceiveMemoryWarning];
      // Dispose of any resources that can be recreated.
  }
  
  -(void)addView2
  {
      TestAppView2 *testAppView2Obj =[ [TestAppView2 alloc]initWithFrame:self.view.bounds];
  
      [testAppView2Obj setDelegate:self];
      [testAppView2Obj setSelectorOnBackButton:@selector(callbackButtonTapped)];
      [self.view addSubview:testAppView2Obj];
  }
  
  -(void)callbackButtonTapped
  {
  
      ViewController *viewControllerObj = [[ViewController alloc]init];
  
       viewControllerObj.lableName=@"Yogesh";    
       [self.navigationController popViewControllerAnimated:YES];
  
  
  }
  
  @end
  </code></pre>
  
  <p>When I try to print the values in NSLog, it gives me nil.</p>