title: watchkit , iOS sending data between watch and iphone
body: <p>I want to create one button in watch and while tapping on watch start one process to my ios app.  How can I send the data between 2 devices</p>
  
  <pre><code>-(void)viewWillAppear:(BOOL)animated
  
  {
   [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(sayHello:) name: @"sayHelloNotification" object: nil];
  
  }
  </code></pre>
  
  <p>plus</p>
  
  <pre><code> [[NSNotificationCenter defaultCenter] postNotificationName: @"sayHelloNotification" object: nil];
  </code></pre>
  
  <p>in my button watch but it doesn't work</p>