title: after turning on switch button its impossible to turn it off
body: <p>how can this switch button be turned off? Here is the code:</p>
  
  <pre><code>&lt;Switch
           onValueChange={(value) =&gt; this.setState({falseSwitchIsOn: true})}
          onTintColor='#42dff4'
           value={this.state.falseSwitchIsOn} /&gt; 
  </code></pre>