Download and compile an MLModel.

MLModel+Download

import CoreML

extension MLModel {
    /**
     
        Use the model: `let model = try MLModel(contentsOf: permanentURL)`
     */
    func download(url: URL) async throws -> URL {
        let request = URLRequest(url: url)
        
        let (data, _) = try await URLSession.shared.data(from: url)
        
        let tempUrl = try FileManager.default.url(
            for: .cachesDirectory,
            in: .userDomainMask,
            appropriateFor: .temporaryDirectory,
            create: true
        )
            .appendingPathComponent("temp.mlmodel")
        
        try data.write(to: tempUrl)
        let compiledModelUrl = try await MLModel.compileModel(at: tempUrl)
        let permanentUrl = try FileManager.default.url(
            for: .applicationSupportDirectory,
            in: .userDomainMask,
            appropriateFor: nil,
            create: true
        )
            .appendingPathComponent("mlmodels")
            .appendingPathComponent(compiledModelUrl.lastPathComponent)
        _ = try FileManager.default.replaceItemAt(permanentUrl, withItemAt: compiledModelUrl)
        try FileManager.default.removeItem(at: tempUrl)
        
        return permanentUrl
    }
}