未调用didBeginContact

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate {
    
    override func didMove(to view: SKView) {
        physicsWorld.contactDelegate = self
    }
    
    func didBegin(_ contact: SKPhysicsContact) {
        // 处理碰撞事件的逻辑
        let firstBody = contact.bodyA
        let secondBody = contact.bodyB
        
        // 判断碰撞的物体类型并执行相应的操作
        if firstBody.categoryBitMask == CategoryBitMask.player && secondBody.categoryBitMask == CategoryBitMask.enemy {
            // 玩家与敌人碰撞
            // 执行相应的操作
        } else if firstBody.categoryBitMask == CategoryBitMask.bullet && secondBody.categoryBitMask == CategoryBitMask.enemy {
            // 子弹与敌人碰撞
            // 执行相应的操作
        }
    }
}

// 碰撞物体的分类
struct CategoryBitMask {
    static let player: UInt32 = 0x1 << 0
    static let enemy: UInt32 = 0x1 << 1
    static let bullet: UInt32 = 0x1 << 2
}