Takes an array of Game Objects, or any objects that have the public property
and then sets it to the given value.
step property is applied incrementally, multiplied by each item in the array.
To use this with a Group:
SetAlpha(group.getChildren(), value, step)
|items||array | Array.<Phaser.GameObjects.GameObject>||
The array of items to be updated by this action.
The amount to set the property to.
This is added to the
An optional offset to start searching from within the items array.
The direction to iterate through the array. 1 is from beginning to end, -1 from end to beginning.
The array of objects that were passed to this Action.