我正在为我的应用程序使用ARKit,我尝试从我的web服务器(URL)动态加载.scn文件
这是我的代码的一部分
let urlString = "https://da5645f1.ngrok.io/mug.scn" let url = URL.init(string: urlString) let request = URLRequest(url: url!) let session = URLSession.shared let downloadTask = session.downloadTask(with: request,completionHandler: { (location:URL?,response:URLResponse?,error:Error?) -> Void in print("location:\(String(describing: location))") let locationPath = location!.path let documents:String = NSHomeDirectory() + "/Documents/mug.scn" ls = NSHomeDirectory() + "/Documents" let fileManager = FileManager.default if (fileManager.fileExists(atPath: documents)){ try! fileManager.removeItem(atPath: documents) } try! fileManager.moveItem(atPath: locationPath,toPath: documents) print("new location:\(documents)") let node = SCNNode() let scene = SCNScene(named:"mug.scn",inDirectory: ls) let nodess = scene?.rootNode.childNode(withName: "Mug",recursively: true) node.addChildNode(nodess!) let nodeArray = scene!.rootNode.childNodes for childNode in nodeArray { node.addChildNode(childNode as SCNNode) } self.addChildNode(node) self.modelLoaded = true }) downloadTask.resume()
NSLog的:
location:Optional(file:///private/var/mobile/Containers/Data/Application/A1B996D7-ABE9-4000-91DB-2370076198D5/tmp/CFNetworkDownload_duDlwf.tmp) new location:/var/mobile/Containers/Data/Application/A1B996D7-ABE9-4000-91DB-2370076198D5/Documents/mug.scn
.scn文件下载与上面提到的(新位置)文件路径..但当我尝试在SCNScene中使用此下载文件
let scene = SCNScene(named:"mug.scn",inDirectory: ls)
总是场景值为零.
错误
Thread 4: Fatal error: Unexpectedly found nil while unwrapping an Optional value
如何解决这个问题.谢谢
解决方法
关于init?(named:String),文档说:
Loads a scene from a file with the specified name in the app’s main bundle
因为您在主包中没有这样的文件(来自下载),您可以尝试使用以下构造函数:
init(url: URL,options: [SCNScenesource.LoadingOption : Any]? = nil)
所以你的代码可能是:
do { let documents = "yourValidpath" let scene = try SCNScene(url: URL(fileURLWithPath: documents),options: nil) } catch {}
原文地址:https://www.jb51.cc/iOS/331699.html
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