How to realize a circle image button with react native
<p>There.
When I was trying to make a circle shaped button component with React Native. I set the borderRadius of an Image half the value of its height and width to make it looks like the circle button and apply gesture responder to it.As a result when i tapped outside the circle but inside some rectangular area around the Image view, the responder event dispatched which is unexpected.</p>

<p>I just cannot figure it out:</p>

<p>Is there any possibility to determine the touch area of Touchable* and how?
Does the gesture responder system support certain area gesture detection? Any help would be appreciated!</p>