ios - Black screen when tab bar is selected -


i having problem black screen when switch "friends" tab on application. happen because of friendsviewcontroller. know because removed link viewcontroller , presented me normal screen. hope can see have done wrong

friendsviewcontroller:

import uikit import fbsdkloginkit   class friendsviewcontroller: uitabbarcontroller, uitableviewdelegate,uitableviewdatasource{    @iboutlet weak var tableview: uitableview! @iboutlet weak var friendtypeswitch: uisegmentedcontrol!  @iboutlet weak var friendsearchbar: uitextfield! var user:user = user()  override func viewdidload() {     super.viewdidload()      print("friends tab")     // additional setup after loading view. } override func viewdidappear(_ animated: bool) {     print("view did appear") }       func tableview(_ tableview: uitableview, numberofrowsinsection section: int) -> int {     return 30 } //what tableview func tableview(_ tableview: uitableview, cellforrowat indexpath: indexpath) -> uitableviewcell {     let cell = self.tableview.dequeuereusablecell(withidentifier: "friendcell", for: indexpath) as! friendscustomcell     user.username = "kulgut123"      cell.friendname.text = user.username                return cell } func tableview(_ tableview: uitableview, heightforrowat indexpath: indexpath) -> cgfloat {     return uitableviewautomaticdimension }  func tableview(_ tableview: uitableview, estimatedheightforrowat indexpath: indexpath) -> cgfloat {     return uitableviewautomaticdimension }    }  class friendscustomcell: uitableviewcell{  @iboutlet weak var friendimg: uiimageview!  @iboutlet weak var friendname: uilabel!  }

as ronatory suggests, should subclass friendsviewcontroller uiviewcontroller instead of uitabbarcontroller.

class friendsviewcontroller: uiviewcontroller, uitableviewdelegate,uitableviewdatasource {       //type code here }

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