I fixed the launchscreen, "not-updating/registering ui changes", xcode bug by doing the following steps in order:
-delete app from device and simulator.
-clean xcode: shit-command-k.
-quit xcode and simulator.
-turn off macbook, turn on.
-turn off iphone, turn on.
-reopen xcode.
-add ui button to launchscreen or any other UI element so that buggy xcode register changes.
-build & run project.