title: How to hide a UIPickerView when the user make its choice
body: <p>I've created a custom UIPickerView with the following code</p>
  
  <pre><code>UIPickerView *picker =[[UIPickerView alloc] initWithFrame:CGRectMake(139,50,161,30)];
      picker.delegate=self;
      picker.showsSelectionIndicator=YES;
      picker.hidden=NO;
  
      [self.view addSubview:picker];
  </code></pre>
  
  <p>Now I want to hide the pickerView when the user make its choice of a row simply with</p>
  
  <pre><code>picker.hidden=YES;
  </code></pre>
  
  <p>Now:
  1) How can I recognize the choice of the user and then hide the unuseful pickerview?
  2) Can I show the choice in a TextField? with @"choice"?</p>