title: How to customize the switch button in a flutter
body: <p>In my app, I want the switch is used to toggle a setting between on/off which is true/false respectively. When I went to build it, it turned out that flutter provides a default switch but it is not what I want, I want to customize it accordingly to my UI</p>
  <p>This is the flutter switch button: -</p>
  <p><img src="https://i.stack.imgur.com/tLAsA.png" alt="enter image description here" /></p>
  <p>Here is what I want: -</p>
  <p><img src="https://i.stack.imgur.com/WLfHF.png" alt="enter image description here" /></p>
  <p>How can I make it possible for my UI?</p>