CODEWITHSUNDEEP
swiftnsurlsessionnsurlsessiondownloadtask
pshah
pshah

Reputation: 2082

Subclass URLSession iOS 10

I'm trying to subclass URLSession on iOS 10 using Xcode 8. I believe the Swift type system is getting confused, but I may be missing something:

class MyURLSession: URLSession {

// No errors
override func downloadTask(with request: URLRequest) -> URLSessionDownloadTask {
    return URLSessionDownloadTask()
}

// No errors
override func downloadTask(with url: URL) -> URLSessionDownloadTask {
    return URLSessionDownloadTask()
}

// See errors below
override func downloadTask(with request: URLRequest, completionHandler: @escaping (URL?, URLResponse?, Error?) -> Void) -> URLSessionDownloadTask {
    return URLSessionDownloadTask()
}

// See errors below
override func downloadTask(with url: URL, completionHandler: @escaping (URL?, URLResponse?, Error?) -> Void) -> URLSessionDownloadTask {
    return URLSessionDownloadTask()
}
}



error: method does not override any method from its superclass
    override func downloadTask(with request: URLRequest, completionHandler: @escaping (URL?, URLResponse?, Error?) -> Void) -> URLSessionDownloadTask {
                  ^
Foundation.URLSession:6:15: note: potential overridden instance method 'downloadTask(with:completionHandler:)' here
    open func downloadTask(with request: URLRequest, completionHandler: @escaping (URL?, URLResponse?, Error?) -> Swift.Void) -> URLSessionDownloadTask
              ^
Foundation.URLSession:7:15: note: potential overridden instance method 'downloadTask(with:completionHandler:)' here
    open func downloadTask(with url: URL, completionHandler: @escaping (URL?, URLResponse?, Error?) -> Swift.Void) -> URLSessionDownloadTask
              ^
/Users/pshah/Networking/Webservice.swift:108:19: error: method does not override any method from its superclass
    override func downloadTask(with url: URL, completionHandler: @escaping (URL?, URLResponse?, Error?) -> Void) -> URLSessionDownloadTask {
                  ^
Foundation.URLSession:6:15: note: potential overridden instance method 'downloadTask(with:completionHandler:)' here
    open func downloadTask(with request: URLRequest, completionHandler: @escaping (URL?, URLResponse?, Error?) -> Swift.Void) -> URLSessionDownloadTask
              ^
Foundation.URLSession:7:15: note: potential overridden instance method 'downloadTask(with:completionHandler:)' here
    open func downloadTask(with url: URL, completionHandler: @escaping (URL?, URLResponse?, Error?) -> Swift.Void) -> URLSessionDownloadTask
              ^

Upvotes: 1

Views: 775

Answers (1)

pshah
pshah

Reputation: 2082

I figured it out. I have a Error in my project, so had to qualify Error? as Swift.Error? in the methods with errors.

Upvotes: 1

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