In this part of the tutorial Nash Vail will start by replacing the photographer’s name with the actual wallpaper image along with proper credits. During this process you’ll learn how to link a library in Xcode, as well as more on general styling and positioning of UI elements. You will learn how to save pictures to the Camera Roll and also how to run your app on a physical device. To apply all your newly learned React Native skills there is a challenge waiting for you at the end. Just like the first part, this article has five sections. Completing each section takes us a step closer to finishing our app.