title: UIPickerView, how to fire a on-change event to initialise
body: <p>When my PickerView is displayed, I need to fire a selection event so that a text field is updated (as on load up it is blank), below is the method that responds to change events:</p>
  
  <pre><code>- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
  
  // update things
  
  }
  </code></pre>
  
  <p>the best I can come up with is (in viewDidLoad of ViewController):</p>
  
  <pre><code>[self pickerView: pickerView didSelectRow: 0 inComponent 0] 
  </code></pre>
  
  <p>this causes an error </p>
  
  <p>"instance method - pickerView: didSelectRow: inComponent:' not found return type defaults to 'id')"        but it works?!</p>
  
  <p>(I've named my UIPickerView object 'pickerView' by the way!)</p>