title: CATiledLayer blinks after zoom
body: <p>I have UIScrollView with BIG subview with lots small CATiledLayers displaying images.</p>
  
  <p>With zoomDidEnd I set new scale: </p>
  
  <pre><code>[tilesContainer setContentScaleFactor:scale];
  </code></pre>
  
  <p>cause redraw tilesContainer view with all it's layers with:</p>
  
  <pre><code>-(void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx 
  </code></pre>
  
  <p>And I get perfect result: detailed images after zoom. </p>
  
  <p>But there is a <strong>blink</strong> of all those layers (when loading new data).</p>
  
  <p>Is it possible to hide it somehow?</p>
  
  <p>I need to hold the old images in layers till load the new one.</p>
  
  <p>Thanks a lot for <em>any</em> help!</p>