my iPhone is stuck on "turning off" after icloud switch to turn off

After trying to turn off iCloud, my iPhone is stuck in "turning off" message, it still there after 24 hours.

Background of my decision to turn off iCloud was that I shot several movies during a concert and my iPhone started complaining about iCloud space. The only option being to upgrade my service. I couldn't copy and delete my photos and movies in my MacBook, which I was stunned since you can do that on Windows and Linux.