React Native Create Custom Square Shape View. This tutorial explains how to create custom rectangle and square shape view in react native application. Geometric Shape Square. The square is a geometric shape that belongs to the quadrilateral family because it has 4 sides. The 4 sides are the same length and are parallel to each other. Design & implementation of square shape is very easy and here we are going to use css stylesheet design for this. Lets follow the below steps and build more understanding.