title: Calling method from another ViewController
body: <p>I have a ViewControllerA and a ViewControllerB. I want calling a method of ViewControllerA from ViewControllerB.</p>
  
  <p>In ViewControllerA is present a method:</p>
  
  <pre><code>  -(NSMutableArray*) loadData;
  </code></pre>
  
  <p>In ViewControllerB.h:</p>
  
  <pre><code> #import "ViewControllerA.h"
    .......
   @property (nonatomic, strong) ViewControllerA * viewControllerA;
   @property (nonatomic, strong) NSMutableArray * mutableArray;
  </code></pre>
  
  <p>In ViewControllerB.m:</p>
  
  <pre><code>self.mutableArray =[viewControllerA loadData];
  </code></pre>
  
  <p>but the method is not calling. Why? Thanks in advance</p>