title: Set slider to initial position - React native
body: <p>I have an app in which there is a common slider to display 2 different data values. And a <code>button</code> which controls the values to show (i.e. To use <code>Array1 Or Array2</code>). 
  <code>Slider</code> is displaying all values properly while doing back-n-forth in <code>slider</code>.</p>
  
  <p>When I click the <code>button</code>, I update the <code>state</code>, <code>Render</code> gets called with correct <code>Array</code> to load from. </p>
  
  <p>Issue: <code>Slider</code> starts from some random position. I want slider head to go to initial position. </p>
  
  <p>Below is my slider code,</p>
  
  <pre><code> &lt;Slider style={styleSliderView.slider}
                  minimumValue={0}
                  maximumValue={arr.length-1}
                  step={1}
                  onValueChange={(value)=&gt;this._onValueChange(value)}/&gt;
  </code></pre>
  
  <p>Any thoughts. </p>