GKStateMachine

玩家进入GameScene场景中 -> 通过GKStateMachine进入到指定的游戏状态GKState

在GameScene场景中 -> 根据不同的逻辑调用GKStateMachine -> 在各个不同的游戏状态GKState之间进行切换

源码如下：

一、GameScene.swft

import SpriteKit
import GameplayKit

class GameScene: SKScene,SKPhysicsContactDelegate {
    
    //MARK: - StateMachine 场景中各个舞台State
    lazy var stateMachine:GKStateMachine = GKStateMachine(states: [
        WaitingState(scene: self),
        PlayState(scene: self),
        GameOverState(scene: self)])

override func didMove(to view: SKView) {
 stateMachine.enter(MenuState.self) 

二、MenuState.swft

//
//  MenuState.swift
//  Copyright © 2018 iFiero. All rights reserved.
//

import SpriteKit
import GameplayKit

class MenuState:GKState {
    
    

三、PlayingState.swft

import SpriteKit
import GameplayKit

class PlayState:GKState {
    unowned let scene:GameScene
    
    init(scene:SKScene){
        self.scene = scene as! GameScene
        super.init()
        print("Play State")
    }
    
    override func didEnter(from previousState: GKState?) {
        
    }

    

四、GameOverState.swft

import SpriteKit
import GameplayKit

class GameOverState:GKState {
    
    unowned let scene:GameScene
    init(scene:SKScene){
        self.scene = scene as! GameScene
        super.init()
    }
    
    override func didEnter(from previousState: GKState?) {
        print("GameOver State 游戏结束")
    }
    
    override func isValidNextState(_ stateClass: AnyClass) -> Bool {
        return stateClass is PlayState.Type
       

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源码传送门:https://github.com/apiapia/BreakOutGameVansVTutorial