What is the black screen of Apple's 7p rear camera?

First of all, rule out whether it is a system problem, close all background programs of the mobile phone and restart the camera function. If the problem still exists, it is recommended to go to a regular after-sales service center nearby, first check whether the camera hardware is a system problem, close all background programs of the mobile phone, and restart the camera function. If the problem still exists, I suggest you go to a regular after-sales service center nearby to check whether it is a camera hardware problem. First rule out whether it is a system problem, close all background programs of the mobile phone and restart the photo function. If the problem still exists, I suggest you go to a regular after-sales service center nearby to check whether it is a camera hardware problem. First rule out whether it is a system problem, close all background programs of the mobile phone and restart the photo function. If the problem still exists, I suggest you go to a regular after-sales service center nearby to check whether it is a camera hardware problem. First rule out whether it is a system problem, close all background programs of the mobile phone and restart the photo function. If the problem still exists, I suggest you go to a regular after-sales service center nearby to check whether it is a camera hardware problem.