title: Whether the alloc method increments the reference count of the object
body: <p>When we call <code>alloc</code> with a <code>Class</code>, Whether the object's reference count will be 1. </p>
  
  <p>For example: </p>
  
  <p><code>NSObject *obj = [NSObject alloc];</code> </p>
  
  <p>After this line of code is executed, the reference count of the object is 0 or 1? </p>
  
  <p>I read the <code>alloc</code> source code, But did not find the <code>alloc</code> method will have any action on the object's reference count,At this point the object of the reference count is still 0? </p>
  
  <p>if 0, then the object will be destroyed, but if not 0, how it is achieved,</p>
  
  <p>I hope someone can help me answer the hearts of confusion, thank you!</p>