除了使用NSTimer之外,在iPhone上创建游戏循环的更好方法是什么？

dispatch_queue_t gameQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0);
dispatch_async(gameQueue, ^{
    // 游戏循环中的核心计算任务将在这段代码块中执行
});

#import<Foundation/Foundation.h>

CFRunLoopRef gameLoop;
CFMachPortRef gamePort;

mach_port_t masterPort = mach_task_self();
gameLoop = CFRunLoopGetCurrent();
gamePort = CFRunLoopSourceCreate(CFRunLoopGetCurrent(), kCFRunLoopCommonModes, gameLoopSourceCallBack, nil, mach_msg_type_integer_t.NULL);
CFRunLoopAddSource(gameLoop, gamePort, kCFRunLoopCommonModes);
CFRunLoopRun();   // 使Run Loop无限循环

let gameplayScene = SKScene(fileNamed: "GameplayScene")
addChild(gameplayScene)

let moveSpriteAction = SKAction.moveBy(x: 50, y: 50, duration: NSTimeInterval(2.0 * 30))
let gameLoop = SKAction.repeatForever(SKAction.sequence([moveSpriteAction, SKAction.scaledBy(x: 0.5, y: 0.5, duration: NSTimeInterval(2.0 * 30))]))

let gameLoopDelegate = GameLoopDelegate(frameCount: 10)
gamePlayScene.run(SKAction.repeatActionForever(gameLoop), withKey: "createLoop")

let gameScene = SKEscapeScene(size: CGSize(width: 640, height: 360))

gameScene.runAction(SKAction.wait(forDuration: NSTimeInterval(1.0)))

let shapeLayer = SKShapeLayer()
shapeLayer.frame = sceneRect
shapeLayer.lineWidth = 0
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.lineColor = UIColor.blue.cgColor
shapeLayer.path = CGPath(rect: shapeLayer.frame, transform: nil)
scene.world?.addChild(shapeLayer)