title: Getting Screen width and height
body: <p>Im creating a new subview in XCode using CGRectmake. This I can do fine. But I would like to make the size of the new view 10 pixels less than the screen width. I normally work with Java and would use screen.width-10 to do this. But with ObjC in Xcode I'm not sure how to and couldn't find the info i needed. This what I have so far it creates a box on a button tap but i would like to change the width from 100 to screen width - 10.</p>
  
  <pre><code>//Info Button
  -(IBAction) buttonTapped:(id)sender {
      // create a new UIView
      UIView *newView = [[UIView alloc] initWithFrame:CGRectMake(10,10,100,100)];
  
      // do something, e.g. set the background color to red
      newView.backgroundColor = [UIColor redColor];
  
      // add the new view as a subview to an existing one (e.g. self.view)
      [self.view addSubview:newView];
  
      // release the newView as -addSubview: will retain it
      [newView release];
  }
  </code></pre>
  
  <p>Thanks in advance.</p>