react native button square corners code example

Example: react native button round

<TouchableOpacity
   style={{
       borderWidth:1,
       borderColor:'rgba(0,0,0,0.2)',
       alignItems:'center',
       justifyContent:'center',
       width:100,
       height:100,
       backgroundColor:'#fff',
       borderRadius:50,
     }}
 >
   <Icon name={"chevron-right"}  size={30} color="#01a699" />
 </TouchableOpacity>