title: When to use layoutSubview in iOS
body: <p>I am writing iOS application for iPad that require custom layout.</p>
  
  <p>The layout from portrait and landscape are totally difference, so it can't be solve by using UIAutoResizingMask.</p>
  
  <p>I try to use the layoutSubview Method, but I detected that layout subview is called a lot (from UIScrollView).
  How can i reduce the layoutSubview call to optimize the code , or I should call it by my self when ever the device is rotated. </p>
  
  <p>Thank.</p>