在Swift游戏中处理圆-圆碰撞的最好方法？

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate {
    override func didMove(to view: SKView) {
        physicsWorld.contactDelegate = self
        
        // 创建两个圆形节点
        let circle1 = SKShapeNode(circleOfRadius: 50)
        let circle2 = SKShapeNode(circleOfRadius: 50)
        
        // 设置物理属性
        circle1.physicsBody = SKPhysicsBody(circleOfRadius: 50)
        circle1.physicsBody?.affectedByGravity = false
        circle1.physicsBody?.categoryBitMask = 1
        circle1.physicsBody?.collisionBitMask = 2
        circle1.physicsBody?.contactTestBitMask = 2
        
        circle2.physicsBody = SKPhysicsBody(circleOfRadius: 50)
        circle2.physicsBody?.affectedByGravity = false
        circle2.physicsBody?.categoryBitMask = 2
        circle2.physicsBody?.collisionBitMask = 1
        circle2.physicsBody?.contactTestBitMask = 1
        
        // 添加节点到场景
        addChild(circle1)
        addChild(circle2)
    }
    
    func didBegin(_ contact: SKPhysicsContact) {
        // 处理碰撞事件
        if contact.bodyA.categoryBitMask == 1 && contact.bodyB.categoryBitMask == 2 {
            // circle1和circle2发生了碰撞
            // 执行相应的逻辑
        }
    }
}