title: Take date from datepicker and display it in label
body: <p>I have tried this code:</p>
  
  <pre><code>-(IBAction)btn_strtPeriodclicked:(id)sender{
      UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 250, 0, 0)];
      // ... populate your date picker and format it as you see fit.
      [self.view addSubview:datePicker];   
  }
  </code></pre>
  
  <p>The pickerView display in but too light color.My questions are:</p>
  
  <ol>
  <li>How to make picker view visible properly.  </li>
  <li>how to remove picker view.  </li>
  <li>how to display date in label.</li>
  </ol>