Black screen when tab bar is selected - ios

Question

I am having a problem with a black screen when i switch to the "friends" tab on my application. This does happen because of my friendsviewcontroller. I know this because I removed the link to the viewcontroller and it presented me with the normal screen. Hope someone can see what I 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")
// Do any additional setup after loading the view.
}
override func viewDidAppear(_ animated: Bool) {
print("view did appear")
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 30
}
//What to do with 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!
}

Answer 1

As ronatory suggests, you should subclass FriendsViewController from UIViewController instead of UITabBarController.
class FriendsViewController: UIViewController, UITableViewDelegate,UITableViewDataSource {
//type your code here
}