Pauses 'playback' of the iterator. If already paused, does nothing. Use start to resume.
Starts or restarts 'playback' of the iterator.
Starts 'playback' of the iterator. If already started, this does nothing. If paused, continues playback. Use restart if you want to start with a reset.
Cancels the running timer. This will stop playback, and next time start is called, it will be from the beginning.