title: How do you check/change iOS version in React Native?
body: <p>I heard that a new version of iOS came out the other day, and wanted to know if my React Native project would be using that version by default when I build it with XCode, and if not, how can I force it to?</p>
  
  <p><strong>My Questions Are:</strong></p>
  
  <p>1) How do you check what version of iOS a React Native app is using?</p>
  
  <p>2) How do you update the version of iOS in a React Native app?</p>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>Based on @Simon's answer, I have one more question:</p>
  
  <p>3) What determines the default version that a given project has?</p>