SKShapeNodeAVAudioPlayerSKActiongroupsUIBezierPathCGVector- Enumerations
enum, custom enums.
The default gravity of the physicsWorld in SpriteKit is -0.98 by default.
A SKShapeNode lets you define any kind of shape you can draw, along with line width, stroke color and more, and it will render it to the screen.
A SKShapeNode object has a path property which describes the shape we want to draw. This path expects a CGPath that can be easily created using UIBezierPath.
The update(currentTime:) method of SpriteKit is called every frame before it is drawn. This method allows us to update the game state as we want.
An action group in SpriteKit specifies that all actions inside it should execute simultaneously. On the other hand, an action sequence executes them all one at a time.