What are dependency injection approaches for RealityKit in Swift?

Dependency injection is a software design pattern that allows for greater flexibility and testing by decoupling the creation of objects and their dependencies. In the context of RealityKit in Swift, there are several approaches to implement dependency injection:

1. Constructor Injection

This approach involves providing dependencies through a class constructor. This is straightforward and makes it clear what dependencies a class requires.

2. Property Injection

With property injection, dependencies are set via properties instead of the constructor. This can be useful when dependencies need to be changed after the object is created.

3. Method Injection

Method injection passes the dependencies as parameters in a method. This is useful when the dependencies are only needed temporarily.

Example of Constructor Injection

class ARViewController: UIViewController {
    let arView: ARView

    init(arView: ARView) {
        self.arView = arView
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func setup() {
        // Setup ARView
        self.view.addSubview(arView)
    }
}

// Usage
let myARView = ARView(frame: .zero)
let arViewController = ARViewController(arView: myARView)