如何使用gameplaykit在编辑器中向精灵添加组件

Question

I have a component:

class Test: GKComponent {
    override init() {
        super.init()
        print("init ran")
    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        print("coder init ran")
    }
}

I also have a subclass:

class Testing: SKSpriteNode {

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

    }
}

So in my scene editor, I have a sprite. In the editor I subclass it to Testing.

Also in the scene editor I add the component Test.

When I run the project, it runs fine, and it prints both print statements in the Component subclass.

1. Why does it use both init functions and how do I get it to use only 1?

2. How would I add something in this component like an action or something... Say I want the sprite to rotate for example? How would I do this?

Thank you for any help...

Answer 1

1) I guess you do not understand what a component is, A component is not the same thing as an SKSpriteNode , in fact they are 2 completely different things with almost no relationship to each other. When you place a node on the scene with the scene builder, behind the scenes it makes an instance of GKEntity and GKSKComponent automatically. GKSKComponent is the component that holds the SKSpriteNode . Your Test component is a component that does something else. Everything is compartmentalized. Best example, think of a bicycle. The wheels are a component, the chain is a component, the brakes are a component, each that serve a very unique purpose. You need to create (init) all of these objects to get a bicycle.

2) To get other components to work with your SKSpriteNode , you need to get to the entity. The component should have access to it, so you just need to do self.entity . Then you need to find the GKSKComponent , which will have a link to the node you are looking for so that you may apply actions to it.

Here is my class I have made to make it easier for Components to access the node

import GameplayKit

class NodeComponent : GKComponent
{
    public private(set) lazy var node : SKNode = self.entity!.component(ofType: GKSKNodeComponent.self)!.node

    func resetNode(to node:SKNode)
    {
        self.node = node;
    }

}