Iphone7PLUS wechat and QQ can take photos, but the camera of the mobile phone can't take photos. Why?

Hello, you can try the operation. 1. Shut down and restart. Sometimes it may be the camera. Restarting the phone will solve it. 2. There may be something wrong with the mobile phone settings, or the downloaded things interfere with the normal use of the mobile phone system. You can try to restore the phone settings and restore all the settings in Setup General. 3. System problems, you can connect to itunes to repair the system.