title: Cant check if CGPoint is not equal CGPointZero
body: <p>I have a <code>CGPoint</code> declared in a <code>UIView</code> class, in my <code>viewController</code> I try to check if that <code>CGPoint</code> is not equal to <code>CGPointZero</code>, but I get this error:<code>Invalid operands to binary expression ('CGPoint' (aka 'struct CGPoint') and 'CGPoint')</code></p>
  
  <p>This is the if-statement:</p>
  
  <pre><code>if (joystick.velocity != CGPointZero)
  </code></pre>
  
  <p>The error points to the != and I dont know why it gives me an error.</p>
  
  <p><code>joystick</code> is the <code>UIView</code> class, <code>CGPoint velocity</code> is declared like this: </p>
  
  <p><code>@property(nonatomic) CGPoint velocity;</code></p>