title: Change prefix icon color of text form field in flutter on clicking the field
body: <p>I have a name form field in flutter app. There's a prefix icon in it. When I click the form field the color of icon changes to blue, rather I want to change it to green. How can I do that, can anyone please guide me? This is its code :</p>
  <pre><code>
   TextFormField(
        decoration: InputDecoration(
          focusedBorder: OutlineInputBorder(
            borderSide: const BorderSide(color: Colors.green, width: 2.0),
            borderRadius: BorderRadius.circular(10.0),
          ),
          prefixIcon: const Icon(Icons.person),
         
          hintText: &quot;Name&quot;,
          border: OutlineInputBorder(borderRadius: BorderRadius.circular(10)),
        ),
      );
  </code></pre>