title: UIPickerView reloadData
body: <p>I'm changing components (in particular, the number and color of components), in a UIPickerView that I call pickerOne, so after making the changes, I call:</p>
  
  <pre><code>[pickerOne reloadData];
  </code></pre>
  
  <p>and it appears to be working perfectly however, I'm getting a compile warning:</p>
  
  <pre><code>warning: 'UIPickerView' may not respond to '-reloadData'
  </code></pre>
  
  <p>Although this appears to work, is there something else that I should use to reload data?</p>
  
  <p>Thanks</p>