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Brian Nezhad
Brian Nezhad

Reputation: 6258

Cannot invoke 'dataTaskWithRequest' with an argument list of type '(NSMutableURLRequest, (_, _, _) throws -> _)'

After start using Swift 2 in Xcode 7 Beta, I get an error cannot invoke. What cause this issue?

I try to figure out my problem by following these 2 questions, but i still get the error: Question 1, Question 2

Error:

Cannot invoke 'dataTaskWithRequest' with an argument list of type '(NSMutableURLRequest, (_, _, _) throws -> _)'

Complete Code

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {data, response, error in
            let json = try NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers) as? NSDictionary

            if let parseJSON = json {
                let resultValue:String = parseJSON["status"] as! String

                if(resultValue=="Success"){

                    //Store Confimed Account Detail Inside Core Data
                    try self.saveAccountDetail(userloginTextField!, confirmDataRetrieve: 0)

                    //Login is Successful
                    NSUserDefaults.standardUserDefaults().setBool(true, forKey: "isUserLoggedIn")
                    NSUserDefaults.standardUserDefaults().synchronize()

                    self.dismissViewControllerAnimated(true, completion: nil)

                }
            }

        }

Upvotes: 5

Views: 4581

Answers (3)

Jignesh
Jignesh

Reputation: 310

Change from try to try! Then it will start compiling as norm.

Upvotes: 2

Leo Dabus
Leo Dabus

Reputation: 236260

try like this:

let task =  NSURLSession.sharedSession().dataTaskWithRequest(request,
    completionHandler: {
        (data, response, error) -> Void in
        if let data = data {
            println(data.length)
            // you can use data here
        } else if let error = error {
            println(error.description)
        }
})
task!.resume()

you can test with this one

let task =  NSURLSession.sharedSession().dataTaskWithRequest(
    NSURLRequest(URL: NSURL(string: "https://cdn.photographylife.com/wp-content/uploads/2014/06/Nikon-D810-Image-Sample-6.jpg")!),
    completionHandler: {
        (data, response, error) -> Void in
        if let data = data {
            println(data.length)
            if let image = UIImage(data: data) {
                println(image.description)
            }

        } else if let error = error {
            println(error.description)
        }

})
task!.resume()

Upvotes: 1

Brian Nezhad
Brian Nezhad

Reputation: 6258

Thanks to Leo Dabus, with his help I figure out that this is the new feature in Swift 2. the way you type in the code should be to try or try! Handling

NSJSONSerialization should be run: (if is throwing input your remove the !)

let json = try!NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary

Upvotes: 5

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