在SpriteKit中呈现场景而不丢弃之前的场景？

问题描述

我的情况是我有一个 GameMenuScene ，在用户选择一个级别后，我想呈现 LevelScene 。但是我不希望丢弃之前的 GameMenuScene ，因为 LevelScene 实际上是 @属性 GameMenuScene 以及用户是否完成该级别将保存为 @property of LevelScene ， GameMenuScene 应该能够在用户完成或退出关卡后访问。如果我只使用 presentScene：transition ，则会丢弃 GameMenuScene ，并且无法传回信息。

My situation is that I have a GameMenuScene and after the user chooses a level, I want to present the LevelScene. But I do not want to have the previous GameMenuScene discarded because the LevelScene is actually a @property of GameMenuScene and whether or not the user completes the level is to be saved as a @property of LevelScene, which the GameMenuScene should be able to access after the user finishes or exits the level. If I simply use presentScene:transition, the GameMenuScene is discarded and the information cannot pass back.

我的问题：有没有办法将场景叠加或推到彼此之上而不丢弃之前的场景（最好是使用过渡动画）？我无法在Apple文档中为SKScene找到这种特定用途的方法。

My question: Is there a way to stack or push the scenes on top of each other without discarding the previous (preferably using a transition animation)? I could not find a method for this specific purpose in the Apple Documentation for SKScene.

注意：另一个StackOverflow对类似问题的回答建议创建一个新的 UIViewController ，在那里显示 LevelScene ，然后以模态方式显示 UIViewController 。但是我希望Apple文档中有一个现有的方法，我错过了以模态方式呈现场景本身，而不必创建 UIVIewControllers 。

Note: Another StackOverflow answer to a similar question suggests to create a new UIViewController, present the LevelScene in there and then present the UIViewController modally. But I was hoping there was an existing method in the Apple Documentation that I have missed to present the scene itself scene modally without having to create UIVIewControllers.

推荐答案

SKScenes没有类似导航控制器的功能，可以推送和弹出场景。您需要编写代码来管理和呈现您的场景。

There is no navigation controller-like capability for SKScenes that allows you to push and pop scenes. You will need to write code to manage and present your scenes.

这是一个简单的视图控制器实现，允许您在两个场景之间切换（通过滑动）而不丢弃另一个场景场景。

Here's a simple view controller implementation that allows you to switch between two scenes (by swiping) without discarding the other scene.

@interface ViewController()

@property BOOL viewFlag;
@property SKScene *scene1;
@property SKScene *scene2;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Configure the view.
    SKView * skView = (SKView *)self.view;
    skView.showsFPS = YES;
    skView.showsNodeCount = YES;

    UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc]
                                              initWithTarget:self action:@selector(handleSwipeGesture:)];
    swipeGesture.direction = UISwipeGestureRecognizerDirectionRight;
    [self.view addGestureRecognizer:swipeGesture];

    // Create and configure scene 1.
    SKScene * scene = [MyScene sceneWithSize:skView.bounds.size];
    scene.scaleMode = SKSceneScaleModeAspectFill;

    self.scene1 = scene;

    // Present the scene 1.
    [skView presentScene:scene];

    // Create and configure scene 2.
    scene = [MySecondScene sceneWithSize:skView.bounds.size];
    scene.scaleMode = SKSceneScaleModeAspectFill;

    self.scene2 = scene;
}

- (void) handleSwipeGesture:(id)sender
{
    SKView * skView = (SKView *)self.view;
    _viewFlag = !_viewFlag;
    if (_viewFlag) {
        [skView presentScene:_scene1];
    }
    else {
        [skView presentScene:_scene2];
    }
}

@end

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