ios - Cannot asign value type '()' to type String? -

i trying information request using completionhandler. thing need array information other part of code , seems can't access it. here access data:

private func loaduserdata(completionhandler: @escaping ([string]) -> ()) {     // we're getting user info data json response     let session = twitter.sharedinstance().sessionstore.session()     let client = twtrapiclient.withcurrentuser()     let userinfourl = "https://api.twitter.com/1.1/users/show.json"     let params = ["user_id": session?.userid]     var clienterror : nserror?     let request = client.urlrequest(withmethod: "get", url: userinfourl, parameters: params, error: &clienterror)     client.sendtwitterrequest(request) { (response, data, connectionerror) -> void in         if connectionerror != nil {             print("error: \(connectionerror)")         }          {             let json = json(data: data!)             if let username = json["name"].string,                 let description = json["description"].string,                 let followerscount = json["followers_count"].int,                 let favouritescount = json["favourites_count"].int,                 let followingcount = json["friends_count"].int,                 let lang = json["lang"].string,                 let nickname = json["screen_name"].string {                      self.userdata.append(username)                     self.userdata.append(description)                     self.userdata.append(string(followerscount))                     self.userdata.append(string(favouritescount))                     self.userdata.append(string(followingcount))                     self.userdata.append(lang)                     self.userdata.append(nickname)                      completionhandler(self.userdata)             }         }     } }  func manageuserdata(index: int) {     loaduserdata() {_ in          return self.userdata[index]     } } 

and here need data show it:

override func tableview(_ tableview: uitableview, cellforrowat indexpath: indexpath) -> uitableviewcell {     let rownumber = indexpath.row     let cellidentifier = "tableviewcell"     guard let cell = tableview.dequeuereusablecell(withidentifier: cellidentifier, for: indexpath) as? tableviewcellcontroller else {         fatalerror("the dequeued cell not instance of tableviewcellcontroller.")     }      switch rownumber {         case 0:             cell.titleplaceholder.text = "name:"             cell.valueplaceholder.text = manageuserdata(index: 1) 

in last line it's error occurs: "cannot asign value of type '()' type string?. not sure if using completionhandler in order retrieve data , ensure can access different parts of code.

any idea ? thank much!

update not using completionhandler properly. changed :

private func loaduserdata(completion: @escaping (_ myarray: [string]) -> void) 

so manageuserdata function looks this:

func manageuserdata() {     loaduserdata {         (result: [string]) in         self.seconduserdata = result     } } 

hope helps!

since async network call, should start call in vc's viewwillappear, viewdidappear, or viewdidload -- depending on if need data reload.

override func viewwillappear(_ animate: bool) {     super.viewwillappear(animate)     sessionmanager.loaduserdata { (strings) in      } } 

then inside of loaduserdata closure ran whenever call complete, load data array used tableview's datasource , call tableview.reloaddata()

sessionmanager.loaduserdata { (strings) in      self.datasource = strings     self.tableview.reloaddata() } 

then cellforrow need:

override func tableview(_ tableview: uitableview, cellforrowat indexpath: indexpath) -> uitableviewcell {     let rownumber = indexpath.row     let cellidentifier = "tableviewcell"     guard let cell = tableview.dequeuereusablecell(withidentifier: cellidentifier, for: indexpath) as? tableviewcellcontroller else {         fatalerror("the dequeued cell not instance of tableviewcellcontroller.")     }      switch rownumber {         case 0:             cell.titleplaceholder.text = "name:"             cell.valueplaceholder.text = datasource[0]     } } 

make sure numberofrows returning datasource.count