title: What are the defaults values for @property in iOS?
body: <p>What are the defaults values for @property in iOS ?</p>
  
  <p>For example, if I declare @property NSString* photographer; </p>
  
  <p>is the default value (assign) or (retain) or what else ?</p>
  
  <p>(atomic, non-atomic) ?</p>
  
  <p>I cannot find this information from the documentation.
  thanks</p>