在 SpriteKit 中，是否可以通过编程方式将元素添加到场景中，以便在打开 .sks 时显示它们？

Question

在 SpriteKit 中，是否可以通过编程方式将元素添加到场景中，以便在打开 .sks 时显示它们？目前我有我的 GameScene（扩展 SKScene）class，它使用 UnarchiveFromFile 方法模式从 .sks 文件打开场景编辑器中已经添加的元素。此方法如下所示：

    @implementation SKScene (Unarchive)

+ (instancetype)unarchiveFromFile:(NSString *)file {
    /* Retrieve scene file path from the application bundle */
    NSString *nodePath = [[NSBundle mainBundle] pathForResource:file ofType:@"sks"];
    /* Unarchive the file to an SKScene object */
    NSData *data = [NSData dataWithContentsOfFile:nodePath
                                          options:NSDataReadingMappedIfSafe
                                            error:nil];
    NSKeyedUnarchiver *arch = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
    [arch setClass:self forClassName:@"SKScene"];
    SKScene *scene = [arch decodeObjectForKey:NSKeyedArchiveRootObjectKey];
    [arch finishDecoding];

    return scene;
}

@end

我怎样才能做与 unarchiveFromFile 相反的事情，即。从代码开始并将精灵添加到 .sks 文件。之后， unarchiveFromFile 将被触发，其余的将按现在的方式进行。有什么建议吗？谢谢

Answer 1

您不想在代码中更新您的 .sks 文件，即使您设法弄清楚了如何做。我想你想要做的是在 didMoveTo(view:)

中向场景添加元素

https://developer.apple.com/documentation/spritekit/skscene/1519607-didmove

didMove(to:) Called immediately after a scene is presented by a view.

Discussion This method is intended to be overridden in a subclass. You can use this method to implement any custom behavior for your scene when it is about to be presented by a view. For example, you might use0 this method to create the scene’s contents.

下面是添加边框的示例：

override func didMove(to view: SKView) {
/* Setup your scene here */

//        drawBorder()
let border = drawSKShapeNode([CGPoint.zero,
    CGPoint(x: 0, y: frame.height),
    CGPoint(x: frame.width, y: frame.height),
    CGPoint(x: frame.width, y: 0)],
                             withWidth: 10,
                             inColour: SKColor.yellow,
                             called: "border")
border.zPosition = 200
addChild(border)
}

// Helper function to draw an SkShapeNode

    func drawSKShapeNode(_ withPoints: [CGPoint], withWidth width: CGFloat, inColour colour: SKColor, called name: String) -> SKShapeNode {

        var points = withPoints
        let shape = SKShapeNode(points: &points, count: points.count)
        shape.lineWidth = width
        shape.strokeColor = colour
        shape.name = name

        return shape 
}

Answer 2

我解决了我的实际问题！ - 只需在场景中放置一个图表并将其写入代码即可。它是一个导航图，并且工作正常。然而，程序化添加不起作用。

在 SpriteKit 中，是否可以通过编程方式将元素添加到场景中，以便在打开 .sks 时显示它们？

In SpriteKit, is it possible to add elements programmatically to the scene, so when .sks is opened, they display?

sprite-kit

scene

skscene