在创建新的SCNNode之前，删除SCNNode不会释放内存

问题描述

我正在构建一个使用Scenekit根据数据库返回的信息显示场景的应用程序。我创建了一个带有类func的自定义类，它创建了一个包含需要绘制的所有内容的SCNNode并将其返回给我的SCNView。在调用此函数之前，我删除任何现有节点。一切都很好，直到我需要第二次调用它。删除旧SCNNode后，在创建新内存之前不会释放内存。有没有标准的方法来删除和替换SCNNode而不会使内存过载？我是iOS开发人员的新手，之前从未真正做过图像。谢谢

I am building an app that uses Scenekit to display a scene based on information returned from a data base. I have created a custom class with a class func that creates a SCNNode containing everything that needs to be drawn and returns it to my SCNView. Before calling this function I remove any existing nodes. Everything works great until I need to call it a second time. After removing the old SCNNode The memory is not deallocated before creating the new one. Is there a standard way of removing and replacing an SCNNode without overloading memory? I'm new to iOS dev and have never really done graphics before either. Thanks

推荐答案

我遇到了同样的问题，我的SceneKit应用程序泄漏了大量内存。如果将几何属性设置为 nil SCNNode 的内存c $ c>在让Swift取消初始化之前。

I had the same problem, with my SceneKit app leaking a lot of memory. The memory of the SCNNode is freed if you set its geometry property to nil before letting Swift deinitialize it.

以下是如何实现它的示例：

Here is an example of how you may implement it:

class ViewController: UIViewController {
    @IBOutlet weak var sceneView: SCNView!
    var scene: SCNScene!

    // ...

    override func viewDidLoad() {
        super.viewDidLoad()
        scene = SCNScene()
        sceneView.scene = scene

        // ...
    }

    deinit {
        scene.rootNode.cleanup()
    }

    // ...
}

extension SCNNode {
    func cleanup() {
        for child in childNodes {
            child.cleanup()
        }
        geometry = nil
    }
}

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