Removing camera button on iPhone lock screen

How to remove the camera button on the iPhone lock screen without removing the camera from the springboard

I don't want to allow people without access to take pictures using my phone (pictures are shared automatically by iCloud) But in the same time, I want to be able to use the camera from the springboard.

I'm searching for a native solution under iOS 8.x or later

The only way this can be done is by using Settings > General > Restrictions to disable the use of the camera completely. A side effect is that FaceTime is also disabled.

There is no other mechanism built-in to do what you want.

There is no native solution for what you want. But to answer your problem of automatically sharing pictures to icloud, you can disable the feature of sharing automatically.

Settings -> icloud -> photos -> turn off photo sharing

This may not be a complete solution, but can reduce the risk of sharing everything. Hope it helps.