表格视图的导航栏下降

Question

I tried to add navigation bar to table view in Main.storyboard. In Main.storyboard, there is no problem navigation bar is seen in the up part of table view.

Also, no problem before data is loaded. Navigation bar is seen in the up part of table view.

But, when all data is loaded, navigation bar is going to down .

I want to keep navigation bar in above part of tableview. Where am I wrong? How to solve this problem?

I think, FirstViewController.swift is not important, nevertheless I am sharing all code.

FirstViewController.swift

import UIKit


class FirstViewController: UIViewController,UITableViewDataSource,UITableViewDelegate {

    @IBOutlet weak var tableView: UITableView!

    var tbCount = 0

    var myMp3s = [Mp3]()

    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.dataSource = self
        tableView.delegate = self

        let url = URL(string: "http://example.php")


        URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in
            guard let data = data, error == nil else { return }

            do {
                let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String:Any]
                let posts = json["server_response"] as? [[String: Any]] ?? []


                for i in posts {

                    print(i["id"]!)

                    let mp3 = Mp3(id: i["id"] as! String, category: i["kategori"] as! String)

                    self.myMp3s.append(mp3)


                }

                self.tableView.reloadData()


                print("counte", self.myMp3s.count)

            } catch let error as NSError {
                print(error)
            }
        }).resume()

    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return myMp3s.count

    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell  = UITableViewCell()

        cell.textLabel?.textAlignment = .center

        cell.textLabel?.text = self.myMp3s[indexPath.row].category

        return cell
    }


    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print(myMp3s[indexPath.row].category)
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }



}

Answer 1

This will create a navigation bar

Answer 2

The issue is you have drag and drop the NavigationBar from Object library to your ViewController so remove it. If you want to show the NavigationBar embed YourViewController to UINavigtionController .

To Embed your ViewController to NavigationConttoller follow this steps.

1. Select your ViewController in Interface builder
2. Go to the Editor menu and select the Embed In.
3. From the new option list select NavigationController

To set title to your Navigation bar , select the Navigation Item for your ViewController from the Document Outline Bar after that go in Attribute Inspector section and set title.

You can also set title programmatically, add below line in viewDidLoad

self.title = "Title"

Answer 3

As Per My View Try To set A Navigationbar In a headerview of tableview. that will not move down.