title: How to synchronize multiple animations in different views
body: <p>I'm working on an iPhone application that uses pulsating buttons and displays a clock.. so I need to synchronize the pulsating buttons with one another and with the clock display..</p>
  
  <p>I'm no Core Animation expert, but so far the only synchronization mechanisms I have found work between CALayers of the same view. Am I missing something or is there really no way of synchronizing animations between views and with external events? </p>
  
  <p>Any pointers in the right direction would be greatly appreciated!</p>
  
  <p>BTW the app is specifically developed for iOS 5 should that make any difference.</p>