title: PNG files are not displayed on IOS device after rename them
body: <p>I had images starting with capital letters, I needed to change first letter of images manually on bundle , after doing that device can not show <code>SOME</code> of the images are not displayed while some of the images are displayed.</p>
  
  <p>Such as:
  <code>C_120x120@2x.png</code>
  to
  <code>c_120x120@2x.png</code></p>
  
  <p>I get an array of letters</p>
  
  <pre><code>legend (
      g
  )
  </code></pre>
  
  <p>and display them with</p>
  
  <pre><code>if ([testArray count]==1) {
              NSString *legendName=[NSString stringWithFormat:@"%@_120x120@2x.png",[testArray objectAtIndex:0]];
              UIImage *trackImage = [UIImage imageNamed:legendName];
              cell.imageView.image= trackImage;
              }
  </code></pre>
  
  <p>NSLOG:</p>
  
  <pre><code>track image string g_120x120@2x.png
  track image (null)
  </code></pre>
  
  <p>In Bundle:</p>
  
  <p><img src="https://i.stack.imgur.com/sKruH.png" alt="enter image description here"></p>
  
  <p>In finder project folder:</p>
  
  <p><img src="https://i.stack.imgur.com/vigw7.png" alt="enter image description here"></p>
  
  <p>What I tried:</p>
  
  <pre><code>1) checked the case like above it looks like file names are correct;
  2) deleted the images, changed the names before I add them to project.
  3) delete the app on device , reinstalled it.
  4) changed setting "Compress PNG Files" to NO
  </code></pre>
  
  <p>after doing everything above if I call <code>C_120x120@2x.png</code> in image it is displayed while <code>c_120x120@2x.png</code> is not displayed. </p>
  
  <p>How can I solve this? </p>