CODEWITHSUNDEEP
iosswift3option-type
Daniel D
Daniel D

Reputation: 1

Initializer for conditional binding must have Optional type, not 'URLSessionDataTask'

I am getting this error, and after researching I still have no idea how to solve it.

Maybe it is something about swift 3 because it appeared when I updated it.

The exact error is in:

guard let task = URLSession.shared.dataTask(with: request, completionHandler: {(data:Data?, response:URLResponse?, error:NSError?) -> Void in

I would appreciate any help.

class func faceForPerson (_ person:String, size:CGSize, completion:@escaping (_ image:UIImage?, _ imageFound:Bool?)->()) throws {
    let escapedString = person.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlHostAllowed)
    
    let pixelsForAPIRequest = Int(max(size.width, size.height)) * 2
    
    let url = URL(string: "https://en.wikipedia.org/w/api.php?action=query&titles=\(escapedString!)&prop=pageimages&format=json&pithumbsize=\(pixelsForAPIRequest)")
    var request = URLRequest(url:url! as URL);
    
    request.httpMethod = "GET";
    guard let task = URLSession.shared.dataTask(with: request, completionHandler: {(data:Data?, response:URLResponse?, error:NSError?) -> Void in
        if error == nil {
            let wikiDict = try! JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments) as! NSDictionary
            
            if let query = wikiDict.object(forKey: "query") as? NSDictionary {
                if let pages = query.object(forKey: "pages") as? NSDictionary {
                    if let pageContent = pages.allValues.first as? NSDictionary {
                        if let thumbnail = pageContent.object(forKey: "thumbnail") as? NSDictionary {
                            if let thumbURL = thumbnail.object(forKey: "source") as? String {
                                let faceImage = UIImage(data: try! Data(contentsOf: URL(string: thumbURL)!))
                                
                                completion(faceImage, true)
                            }
                        }else{
                            completion(nil, false)
                        }
                    }
                }
            }
    
            
        }
    } as! (Data?, URLResponse?, Error?) -> Void)else{
        throw WikiFaceError.couldNotDownloadImage
    }
    
    task!.resume()
    
}

Upvotes: 0

Views: 438

Answers (1)

Tj3n
Tj3n

Reputation: 9943

This guard let task = URLSession.shared.dataTask(with: request, completionHandler: {(data:Data?, response:URLResponse?, error:NSError?) -> Void in doesn't create optional data task (it wont be nil), so you don't need to check optional with guard let, just use let

Also makes no sense you tried to force it become (Data?, URLResponse?, Error?) -> Void)?

Upvotes: 0

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