title: UI Components library for react native
body: <p>I'm building my first big app with react native.
  And want to ask.</p>
  
  <p>Are there are some UI frameworks for react native, which gives some styling for components out of the box?</p>
  
  <p>For example like ionic for cordova gives base theme and css.
  Or like bootstrap for web.</p>
  
  <p>So are there are some existing libraries which gives the same styling effect for react native?</p>
  
  <p>Thanks</p>