title: What is the need for PNG crush in Xcode?
body: <p>I faced an 'PNG crush' error because of 'Default-568@2x.png'. When I unchecked compress PNG files option in the project (Project -> Target -> Build Settings -> Packaging -> Compress PNG Files) I got the error resolved.</p>
  
  <p>So My Questions are:</p>
  
  <ol>
  <li>Why we are using 'PNG crush' in Xcode?</li>
  <li>What happen is we unchecked that option(other that compressing the png).</li>
  <li>What could be the reason for that error?</li>
  </ol>
  
  <p>Thanks in Advance.</p>
  
  <p>Chahal</p>