在 viewController 转换期间如何释放内存

Question

我解释我的问题。

我刚刚制作了一个有 3 个视图的游戏。

1. 带有播放按钮的游戏演示
2. 游戏场景
3. 游戏结束场景带有一个按钮可再次播放或返回演示场景。

我的问题是当两个场景之间有过渡时，活动内存会多出 30MB，每个场景过渡都会增加大约 30MB 的活动内存，并且永远不会减少。

如何修复它并释放内存？

谢谢大家

我的转换代码：

// Transition in presentationViewController file
func transition(sender:UIButton!)
{

    println("transition")
    let secondViewController = self.storyboard?.instantiateViewControllerWithIdentifier("GameViewController") as UIViewController

    let window = UIApplication.sharedApplication().windows[0] as UIWindow
    UIView.transitionFromView(
        window.rootViewController!.view,
        toView: secondViewController.view,
        duration: 0.65,
        options: .TransitionCrossDissolve,
        completion: {
            finished in window.rootViewController = secondViewController
    })
}


// transition in GameScene file

func removeCountDownTimerView()
{

    defaults.setInteger(balloonDestroyed, forKey: "score")
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let gameOverScene: UIViewController = storyboard.instantiateViewControllerWithIdentifier("GameOverViewController") as UIViewController
    let vc = self.view?.window?.rootViewController
    vc?.presentViewController(gameOverScene, animated: true, completion: nil)


}

// transition in gameOverViewController file

func transition(sender:UIButton!)
{
    println("play transition")
    let secondViewController = self.storyboard?.instantiateViewControllerWithIdentifier("GameViewController") as UIViewController


    let window = UIApplication.sharedApplication().windows[0] as UIWindow
    UIView.transitionFromView(
        window.rootViewController!.view,
        toView: secondViewController.view,
        duration: 0.65,
        options: .TransitionCrossDissolve,
        completion: {
            finished in window.rootViewController = secondViewController
    })
}

Answer 1

instantiateViewControllerWithIdentifier("GameViewController") as UIViewController

每次用户按下按钮时，此代码都会创建新的 ViewController。我建议您为此使用单音模式。

private let _SomeManagerSharedInstance = GameViewController() 
class GameOverViewController {
class var sharedInstance: GameOverViewController {
       return _GameOverViewController
}

您还可以创建一个私有类方法来从情节提要中实例化视图控制器。