title: Syntax for Objective-C property of block-type (without typedef)
body: <p>The syntax for declaring a property referring to a block is:</p>
  
  <pre><code>typedef void (^voidBlock)();
  @property (nonatomic, copy) voidBlock callback;
  ...
  @synthesize callback;
  </code></pre>
  
  <p>How could this be done without the typedef?</p>