[英]How to download USDZ by URLSession?
我在我的代码中通过urlsession下载usdz :
let url = URL(string: "download usdz url")
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationUrl = documentsUrl.appendingPathComponent(url!.lastPathComponent)
let session = URLSession(configuration: URLSessionConfiguration.default, delegate: nil, delegateQueue: nil)
var request = URLRequest(url: url!)
request.httpMethod = "GET"
let downloadTask = session.downloadTask(with: request, completionHandler: { (location:URL?, response:URLResponse?, error:Error?) -> Void in
let fileManager = FileManager.default
try! fileManager.moveItem(atPath: location!.path, toPath: destinationUrl.path)
do {
let testEntity = try Entity.load(contentsOf: destinationUrl) // Error
}
catch {
print("\(error.localizedDescription)")
}
})
downloadTask.resume()
但是这段代码崩溃了:
let testEntity = try Entity.load(contentsOf: destinationUrl)
。
大家有这个问题吗?
这个问题解决了。 让实体在主线程上调用。
let url = URL(string: "download usdz url")
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationUrl = documentsUrl.appendingPathComponent(url!.lastPathComponent)
let session = URLSession(configuration: URLSessionConfiguration.default, delegate: nil, delegateQueue: nil)
var request = URLRequest(url: url!)
request.httpMethod = "GET"
let downloadTask = session.downloadTask(with: request, completionHandler: { (location:URL?, response:URLResponse?, error:Error?) -> Void in
let fileManager = FileManager.default
if fileManager.fileExists(atPath: destinationUrl.path) {
try! fileManager.removeItem(atPath: destinationUrl.path)
}
try! fileManager.moveItem(atPath: location!.path, toPath: destinationUrl.path)
DispatchQueue.main.async {
do {
let object = try Entity.load(contentsOf: destinationUrl) // It is work
let anchor = AnchorEntity(world: [0, 0, 0])
anchor.addChild(object)
self.arView.scene.addAnchor(anchor)
}
catch {
print("Fail load entity: \(error.localizedDescription)")
}
}
})
downloadTask.resume()
感谢 BlackMirrorz
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