Blinking or flickering views in the viewfinder of your iPhone camera is a common issue that can be frustrating. It's usually caused by a temporary technical glitch or software bug that can be easily solved with some simple troubleshooting steps.
A few people have been reporting issues with their new iPhone 13 and iPhone 14 cameras blinking or flickering while in use. This is likely due to the Macro mode on these phones that switch between wide and ultra-wide lenses as you get close to objects.
Other causes of this problem include dust, dirt, or debris obstructing the camera lens and sensors, and bugs or crashes with the default Camera app or third-party photography apps. Restarting your iPhone can often fix these problems, as well as clearing out any background apps that are affecting the camera's performance.
Make sure you don't have any cases or accessories that block the camera or flash, especially ones with magnetic clasps. This could wreak havoc with the camera's autofocus capabilities and cause it to flicker or blink when trying to take photos.
Ensure your iPhone isn't running low on storage space. A nearly drained battery might activate power-conservation measures that can trigger erratic system behavior, including camera blinking.
Update your iPhone's operating system if needed. Checking for updates in Settings > General > Software Update is a good place to start. Also, check the App Store for any pending updates for your Camera or Photo app to see if there are any that could fix the problem.