title: iOS: Migration (Upgrade) from Swift 3 to Swift 4
body: <p>Recent major update in iOS application development tool <code>Xcode 9</code> supports <code>Swift 3.2 &amp; 4</code> programming language.</p>
  
  <p>I've my app developed with Swift 3 version and I want to convert/migrate, complete source code from <code>Swift 3 to Swift 4</code>. During migration, it's showing me <code>354 errors</code>.</p>
  
  <p>These errors are fixable. The solution of error is suggested by Xcode itself. But there are 354 errors. How can I fix them all at once? Manual fixing of each error one-by-one will be a time-consuming activity.</p>
  
  <p>Is there any feasible solution to fix all errors at once.</p>
  
  <p>Here is a snapshot with the sample.</p>
  
  <p><a href="https://i.stack.imgur.com/XaWR6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XaWR6.png" alt="enter image description here"></a></p>