How to workaround URLSession issue in watchOS 6.1.1

[onmyway133]

https://stackoverflow.com/questions/59724731/class-avassetdownloadtask-is-implemented-in-both-cfnetwork-and-avfoundation

objc[45250]: Class AVAssetDownloadTask is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/watchOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/CFNetwork.framework/CFNetwork (0x4ddd0ec) and /Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/watchOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/AVFoundation.framework/AVFoundation (0x16aea494). One of the two will be used. Which one is undefined.

objc[45250]: Class AVAssetDownloadURLSession is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/watchOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/CFNetwork.framework/CFNetwork (0x4dddd44) and /Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/watchOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/AVFoundation.framework/AVFoundation (0x16aea4bc). One of the two will be used. Which one is undefined.

Then URLSession stops working.

2020-01-13 22:50:12.430920+0100 MyAppWatch WatchKit Extension[45250:2099229] Task <3CECDE81-59B9-4EDE-A4ED-1BA173646037>.<1> finished with error [-999] Error Domain=NSURLErrorDomain Code=-999 "cancelled" UserInfo={NSErrorFailingURLKey=https://myapp.com/def.json, NSErrorFailingURLStringKey=https://myapp.com/def.json, NSLocalizedDescription=cancelled}

The workaround is to remove Combine based API, and use completion block.

Instead of dataTaskPublisher which hangs indefinitely, no sink is reported

URLSession.shared
.dataTaskPublisher(for: url)
.map({ $0.data })
.decode(type: T.self, decoder: JSONDecoder())
.eraseToAnyPublisher()
.receive(on: RunLoop.main)
.sink(receiveCompletion: { completionStatus in
    switch completionStatus {
    case .finished:
        break
    case .failure(let error):
        completion(.failure(error))
    }
}, receiveValue: { value in
    completion(.success(value))
})

just use normal

let task = URLSession.shared.dataTask(with: url, completionHandler: { data, response, error in
    if let data = data, let model = try? JSONDecoder().decode(T.self, from: data) {
        completion(.success(model))
    } else {
        completion(.failure(error ?? ServiceError.noInternet))
    }
})

task.resume()