Access file downloaded with Alamofire to downloadsdirectory with unknown filename - ios

Question

I have an app for iOS that uses metal to render obj files. I am trying to add functionality for users to insert the url of an obj file online and render that. I am using alamofire and am not sure how I will access the file once downloaded, since I won't know the file name.
let destination = DownloadRequest.suggestedDownloadDestination(for: .downloadsDirectory)
let modelUrl = URL(string: "https://drive.google.com/file/d/110KRnku3N_K_EIN-ZLYXK128zjMqxGLM/view?usp=sharing")
Alamofire.download(
modelUrl!,
method: .get,
parameters: Parameters.init(),
encoding: JSONEncoding.default,
headers: nil,
to: destination).downloadProgress(closure: { (progress) in
//progress closure
}).response(completionHandler: { (DefaultDownloadResponse) in
//here you able to access the DefaultDownloadResponse
//result closure
})
let file = try? String(contentsOf: URL(string: (NSSearchPathForDirectoriesInDomains(.downloadsDirectory, .userDomainMask, true)[0]))!)
I am also fairly certain my method for retrieving the file will not work, but i'm not sure how to search the documents directory for a specific file.
The files I have working are in the project as .obj files in xcode, and I simply use this.
let assetURL = Bundle.main.url(forResource: modelName, withExtension: "obj")

Answer 1

Bundle.main will not return files in document directory, it is use for the files you put in your main bundle (inside Xcode while development usually). You need to use FileManager to access files in document directory. You can use this function to search files in your document directory.
func getFilePathInDocuments(fileName:String) -> String {
let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let url = URL(fileURLWithPath: path)
let fileManager = FileManager.default
let filePath = url.appendingPathComponent(fileName).path
if (fileManager.fileExists(atPath: filePath)) {
return filePath
}else{
return ""
}
}
This is how you call it:
let foundPath = getFilePathInDocuments(fileName: "fileName.obj")
Update:
You can give a fileName to Almofire and you will receive the downloaded URL too from it.
let destinationPath: DownloadRequest.DownloadFileDestination = { _, _ in
let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0];
let fileURL = documentsURL.appendingPathComponent("fileName")
return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
}
Alamofire.download(url, to: destinationPath)
.downloadProgress { progress in
}
.responseData { response in
}
To get downloaded document directory URL use response.destinationURL.