Game Development Reference
In-Depth Information
How it works...
All that we see running on the screen are just frames added by a time interval, which is
driven by a
SKScene
added as a child on the
SKView
that serves as the main scene of the
game.
As shown in the following diagram, a frame circle is present, which depicts the execution
cycle of the game project for each frame:
Some of the methods from the preceding diagram are explained as follows:
• An update method of
SKScene
is called where we can add, remove, animate, and
update different kinds of nodes and actions.
•
SKScene
evaluates its actions that are running for the current frame following
some life cycle calls such as
didEvaluateActions
.
•
SKScene
has its own physics simulation, so if some bodies are added to it, the
physics simulation is also evaluated such as collision detection, applying forces,
and so on.
• All the methods mentioned earlier contribute to the final rendering of SKView,
which is displayed as a frame to the user. Hence, regular running of these frames
makes the game appear as an environment.
