Build a selfie camera timer: React Native stopwatch example

The article provides a comprehensive tutorial on building a selfie camera timer app using React Native, integrated with the device's camera, allowing users to set and save custom durations for their timers. It begins by explaining the prerequisites, including basic knowledge of JavaScript and React Native, and the use of the Expo platform to enhance app development. The tutorial details initializing the project, accessing the device's camera with the expo-camera package, and managing image state, including taking and saving pictures using a custom Button component. It further explores conditional rendering for displaying images, saving pictures to the device using expo-media-library, and implementing a timer functionality connected to the camera, allowing for a countdown before taking a photo. The article concludes with the implementation of a countdown timer for user convenience and provides links to a video demonstration and the complete source code repository on GitHub for further reference.