title: iOS UITest error when try to select picker element
body: <p>I'm trying to select an element of picker, the picker has Accessibility = picker_station, why can I do ? is something wrong ? or I need to use other code.</p>
  
  <pre><code>let app = XCUIApplication()
  app.pickers["picker_station"].pickerWheels.element.adjust(toPickerWheelValue: "Aberdeen")
  </code></pre>
  
  <p>xcode error is: </p>
  
  <pre><code>Testing Failure - Internal error: unable to find current value '1 of 152' in possible values
  </code></pre>
  
  <p>Thanks</p>