从 SKView 获取 SpriteKit 纹理在 104 次调用后返回 nil

Question

在创建纹理时，我在 SpriteKit 中有一些奇怪的行为。下面的函数向您展示了我在做什么。简而言之，我在 SceneKit 中并用一组颜色制作了一个 SCNNode（想想像素/体素）。它就像一个魅力。然而，恰好在 104 次调用之后，返回的纹理为 nil。之后，无论纹理是否为 nil，都会受到影响。我还提供了准确的颜色信息。想法？

   func create2dModelSK(with colors: [String]) -> SCNNode? {
    let geo = SCNBox(width: 1.0, height: 1.0, length: 0.1, chamferRadius: 0.0)

    let base = SCNNode(geometry: geo)

    let view = SKSpriteNode(color: .white, size: CGSize(width: 160, height: 160))
    view.anchorPoint = CGPoint(x: 0, y: 1)
    var xOffset = 0
    var yOffset = 0
    var count = 0
    for _ in 0...15 {
        for _ in 0...15 {
            guard let newColor = UIColor(hexString: "#" + colors[count] + "ff") else { return base }

            let n = SKSpriteNode(color: newColor, size: CGSize(width: 10, height: 10))
            n.anchorPoint = CGPoint(x: 0, y: 1)
            n.position = CGPoint(x: xOffset, y: yOffset)
            view.addChild(n)
            xOffset += 10
            count += 1
        }
        xOffset = 0
        yOffset -= 10
    }
    let skView = SKView(frame: CGRect(x: 0, y: 0, width: 160, height: 160))

    let texture = skView.texture(from: view)
    //AFTER being called 104 times, texture is nil.
    let faceMaterial = SCNMaterial()
    faceMaterial.diffuse.contents = texture

    let sideMaterial = SCNMaterial()
    sideMaterial.diffuse.contents = UIColor.white

    let materialsForBox = [faceMaterial,sideMaterial,faceMaterial,sideMaterial,sideMaterial,sideMaterial]
    base.geometry?.materials = materialsForBox

    let scale = SCNVector3(x: 0.1, y: 0.1, z: 0.1)
    base.scale = scale

    return base
}

Answer 1

这就是autoreleasepool 派上用场的地方，它允许您在autoreleasepool 完成时释放内存，这样您就不会在再次使用之前耗尽空间。

当然这不会解决你的主要问题，你创建了太多纹理并且内存空间不足，但它至少可以让你做更多，因为它会释放 @987654323 的临时内存@正在坚持。

func create2dModelSK(with colors: [String]) -> SCNNode? {
    let geo = SCNBox(width: 1.0, height: 1.0, length: 0.1, chamferRadius: 0.0)

    let base = SCNNode(geometry: geo)

    let view = SKSpriteNode(color: .white, size: CGSize(width: 160, height: 160))
    view.anchorPoint = CGPoint(x: 0, y: 1)
    var xOffset = 0
    var yOffset = 0
    var count = 0
    for _ in 0...15 {
        for _ in 0...15 {
            guard let newColor = UIColor(hexString: "#" + colors[count] + "ff") else { return base }

            let n = SKSpriteNode(color: newColor, size: CGSize(width: 10, height: 10))
            n.anchorPoint = CGPoint(x: 0, y: 1)
            n.position = CGPoint(x: xOffset, y: yOffset)
            view.addChild(n)
            xOffset += 10
            count += 1
        }
        xOffset = 0
        yOffset -= 10
    }
    autoreleasepool{
        let skView = SKView(frame: CGRect(x: 0, y: 0, width: 160, height: 160))

        let texture = skView.texture(from: view)
        //AFTER being called 104 times, texture is nil.
        let faceMaterial = SCNMaterial()
        faceMaterial.diffuse.contents = texture

        let sideMaterial = SCNMaterial()
        sideMaterial.diffuse.contents = UIColor.white

        let materialsForBox = [faceMaterial,sideMaterial,faceMaterial,sideMaterial,sideMaterial,sideMaterial]
        base.geometry?.materials = materialsForBox
    }
    let scale = SCNVector3(x: 0.1, y: 0.1, z: 0.1)
    base.scale = scale

    return base
}