Sometimes the camera app on your iPhone does not get loaded properly, which causes camera black screen problem. In that case, fix the issue by closing the app of the camera forcefully. ... Now, swipe up the interface of the camera and close the cam-app. After doing that, wait for 5 minutes and restart your phone again.

Why is my camera just a black screen?

Hardware issue

If your phone is still showing a black screen after a hard reset, then the problem is caused by a hardware related issue. This means that the camera application has malfunctioned or the lens is broken. If this is the case, take your smartphone for repair.

How do you fix a black screen on a camera?