A stage for a bird
Let's kick-start the game by implementing the background, which is not as straightforward as it might sound.
SpriteKit in a nutshell
SpriteKit is a powerful but easy-to-use game framework introduced in iOS 7.
Basically, it provides the infrastructure to move images onto the screen and interact with them.
It also provides a physics engine (based on Box2D), a particles engine, and basic sound playback support, making it particularly suitable for casual games.
The content of the game is drawn inside SKView, which is a particular kind of UIView, so it can be placed inside a normal hierarchy of UIViews.
The content of the game is organized into scenes, represented by subclasses of SKScene. Different parts of the game, such as the menu, ...
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