ios - ARKIT 2.0 图像检测 : can't find when image disappear with ARImageTrackingConfiguration

Question

在新的 arkit 2.0 文档中，它解释:并且可以准确跟踪图像何时从 View 中消失(或之后重新出现)

如何通知我图像不可见？我找不到有关它的文档。

谢天谢地，凯文

Answer 1

ARImageAnchor 符合 ARTrackable 协议(protocol)，它:

is adopted by ARKit classes, such as the ARFaceAnchor class, that represent moving objects in a scene.

ARSCNView and ARSKView automatically hide the nodes for anchors whose isTracked property is false.

您可以阅读更多相关信息 here .

因此你可以做这样的事情来检查你的图像是否可见:

//--------------------------
//MARK: -  ARSessionDelegate
//--------------------------

extension ViewController: ARSessionDelegate{

    func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {

        //1. Enumerate Our Anchors To See If We Have Found Our Target Anchor
        for anchor in anchors{

            if let imageAnchor = anchor as? ARImageAnchor, imageAnchor == targetAnchor{

                //2. If The ImageAnchor Is No Longer Tracked Then Handle The Event
                if !imageAnchor.isTracked{

                }else{


                }
            }
        }
     }
}

其中 targetAnchor 只是一个 ARImageAnchor 我已将其引用存储为 全局变量。

希望对你有帮助