【swift】dataTask(with: request, completionHandler: でエラー

swift2で書かれた下記コードをswift3でビルド使用とすると、
dataTask(with: request, completionHandler: の部分で

「Cannot invoke 'dataTask' with an argument list of type '(with: NSMutableURLRequest, completionHandler: (Data?, URLResponse?, NSError?) -> ())'」

エラーが発生します。swift3の書き方を教えてください。

class RegisterVC: UIViewController {

@IBOutlet var usernameTxt: UITextField!
@IBOutlet var passwordTxt: UITextField!


override func viewDidLoad() {
    super.viewDidLoad()
}


@IBAction func register_click(_ sender: AnyObject) {
    
    
        let url = URL(string: "http://localhost/register.php")!
        let request = NSMutableURLRequest(url: url)
        request.httpMethod = "POST"            
        let body = "username=\(usernameTxt.text!.lowercased())&password=\(passwordTxt.text!)"
        request.httpBody = body.data(using: String.Encoding.utf8)
        


        URLSession.shared.dataTask(with: request, completionHandler: { (data:Data?, response:URLResponse?, error:NSError?) in
                   ↑ エラーはこの部分です。


            if error == nil {

                DispatchQueue.main.async(execute: { 
                    
                    do {
                        // get json result
                        let json = try JSONSerialization.jsonObject(with: Data!, options: .mutableContainers) as? NSDictionary
                        
                        // assign json to new var parseJSON in guard/secured way
                        guard let parseJSON = json else {
                            print("データエラー")
                            return
                        }
                        
                        
                        let id = parseJSON["id"]
                        
                        // successfully registered
                        if id != nil {
                            
                            
                            UserDefaults.standard.set(parseJSON, forKey: "parseJSON")
                            user = UserDefaults.standard.value(forKey: "parseJSON") as? NSDictionary
                            
                           
                            DispatchQueue.main.async(execute: {
                                appDelegate.login()
                            })
                            
                        // error
                        } else {
                            
                            // get main queue to communicate back to user
                            DispatchQueue.main.async(execute: {
                                let message = parseJSON["message"] as! String
                                appDelegate.infoView(message: message, color: colorSmoothRed)
                            })
                            return
                            
                        }
                        
                        
                    } catch {

                        // get main queue to communicate back to user
                        DispatchQueue.main.async(execute: {
                            let message = String(error)
                            appDelegate.infoView(message: message, color: colorSmoothRed)
                        })
                        return
                        
                    }
                    
                })
                
            // if unable to proceed request
            } else {

                // get main queue to communicate back to user
                DispatchQueue.main.async(execute: {
                    let message = error!.localizedDescription
                    appDelegate.infoView(message: message, color: colorSmoothRed)
                })
                return

            }
            
        // launch prepared session
        }).resume()
        
    }

行動規範の内容に同意します

回答1件

ベストアンサー

対象のエラーは解決しましたが、そちらで定義している部分でエラーになっています。
そちらでは動くと思うので試してみてください。

修正は以下のサイトを参考にしました。
NSMutableURLRequestをNSURLRequestにキャストする必要があるようです。
Swift 3 URLSession.shared() Ambiguous reference to member 'dataTask(with:completionHandler:) error (bug)

swift
1class RegisterVC: UIViewController {
2    
3    @IBOutlet var usernameTxt: UITextField!
4    @IBOutlet var passwordTxt: UITextField!
5    
6    override func viewDidLoad() {
7        super.viewDidLoad()
8    }
9    
10    @IBAction func register_click(_ sender: AnyObject) {
11        
12        let url = URL(string: "http://localhost/register.php")!
13        let request = NSMutableURLRequest(url: url)
14        request.httpMethod = "POST"
15        let body = "username=\(usernameTxt.text!.lowercased())&password=\(passwordTxt.text!)"
16        request.httpBody = body.data(using: String.Encoding.utf8)
17        
18       
19        URLSession.shared.dataTask(with: request  as URLRequest, completionHandler: { (data, response, error) in
20            
21            if error == nil {
22                
23                DispatchQueue.main.async(execute: {
24                    
25                    do {
26                        // get json result
27                        let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
28                        
29                        // assign json to new var parseJSON in guard/secured way
30                        guard let parseJSON = json else {
31                            print("データエラー")
32                            return
33                        }
34                        
35                        let id = parseJSON["id"]
36                        
37                        // successfully registered
38                        if id != nil {
39                            
40                            UserDefaults.standard.set(parseJSON, forKey: "parseJSON")
41                            user = UserDefaults.standard.value(forKey: "parseJSON") as? NSDictionary
42                            
43                            DispatchQueue.main.async(execute: {
44                                appDelegate.login()
45                            })
46                            
47                            // error
48                        } else {
49                            
50                            // get main queue to communicate back to user 
51                            DispatchQueue.main.async(execute: { 
52                                let message = parseJSON["message"] as! String 
53                                appDelegate.infoView(message: message, color: colorSmoothRed) 
54                            }) 
55                            return
56                            
57                        }
58                        
59                    } catch {
60                        
61                        // get main queue to communicate back to user 
62                        DispatchQueue.main.async(execute: { 
63                            let message = String(describing: error)
64                            appDelegate.infoView(message: message, color: colorSmoothRed) 
65                        }) 
66                        return
67                        
68                    }
69                    
70                })
71                
72                // if unable to proceed request 
73            } else {
74                
75                // get main queue to communicate back to user 
76                DispatchQueue.main.async(execute: { 
77                    let message = error!.localizedDescription 
78                    appDelegate.infoView(message: message, color: colorSmoothRed) 
79                }) 
80                return
81            }
82            
83            // launch prepared session
84
85        }).resume()
86        
87    }
88}