title: Xcode: how to build a landscape only iphone program
body: <p>in Xcode, I tried to design a landscape only user interface.</p>
  
  <p>I both set UIViewController and UIView controls to landscape model. but when I placed the controls, like buttons, images on the UIView, when programe running, only the controls which are placed on top-left area response. Seems the programe is still running in portrait mode.</p>