CODEWITHSUNDEEP
iosiphonedatabaseswiftmacos
Fadeef Saleh
Fadeef Saleh

Reputation: 25

how can i fix this error when i try to Using External Database and API's with swift

i try to using external database and api's. so i follow from this video in youtube https://www.youtube.com/watch?v=Ixk93yx-v28

and i see this error

"Value of optional type 'NSURL?' not unwrapped; " on that line

    func request(url:String,callback:(NSDictionary)->()) {
    var nsURL = NSURL(string: url)
    ///////////////////////////on this line/////////////////////////////////
    let task = NSURLSession.sharedSession().dataTaskWithURL(nsURL) {
    /////////////////////////////////////////////////////////////////
        (data,response,error) in
        var error:NSError?
        var response = NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.MutableContainers, error: error) as NSDictionary
        callback(response)
    }
    task.resume()
}

and when i try to fix by put ! in nsURL like this xCode return this error "Extra argument 'error' in call "

func request(url:String,callback:(NSDictionary)->()) {
    var nsURL = NSURL(string: url)

    let task = NSURLSession.sharedSession().dataTaskWithURL(nsURL!) {
        (data,response,error) in
        var error:NSError?
////////////////////////////Error Here/////////////////////////////////////
            var response = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: error) as NSDictionary
/////////////////////////////////////////////////////////////////////////////////
        callback(response)
    }
    task.resume()
}

have any ideal ? sorry for my english

Upvotes: 0

Views: 64

Answers (1)

Dharmesh Kheni
Dharmesh Kheni

Reputation: 71854

Update your function as shown below for swift 2.0:

func request(url:String,callback:(NSDictionary)->()) {
    guard let nsURL = NSURL(string: url) else { return }
    ///////////////////////////on this line/////////////////////////////////
    let task = NSURLSession.sharedSession().dataTaskWithURL(nsURL) {
        /////////////////////////////////////////////////////////////////
        (data, response, error) in
        guard let data = data where error == nil else { return }
        do {
            if let response = try NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.MutableContainers) as? NSDictionary {
                callback(response) 
            }
        } catch let error as NSError {
            print("json error: \(error.localizedDescription)")
        }


    }
    task.resume()
}

Upvotes: 1

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