title: TextInput allow font scaling false
body: <p>I'm building an app with React Native. The problem is that, when the font size is changed through the phone's settings, the font sizes also change in the app, even though they're all set a fixed font size.</p>
  
  <p>For example, consider the following <code>Text</code> element with font size 12:</p>
  
  <pre><code>&lt;Text style={{fontSize: 12}}&gt;Hello World&lt;/Text&gt;
  </code></pre>
  
  <p>I've found out that there's a prop named <code>allowFontScaling</code> for this issue.So, I go to <code>App.js</code> and add the following line for disabling the font scaling throughout the app:</p>
  
  <pre><code>Text.defaultProps.allowFontScaling = false;
  </code></pre>
  
  <p>It works perfectly. However, the same prop doesn't seem be not implemented for <code>TextInput</code> element. When I try doing the same for <code>TextInput</code>, I get the following error:</p>
  
  <blockquote>
    <p>undefined is not an object (evaluating
    '_reactNative.TextInput.defaultProps.allowFontScaling = false')</p>
  </blockquote>
  
  <p>Therefore, I may set a fixed font size for <code>Text</code>, but not <code>TextInput</code>. Is there any workaround for this issue? My react-native version is 0.48.4.</p>
  
  <p>Thanks in advance.</p>