Ios 即使在实现委托方法之后，也不会显示页面控件

添加委托和数据源后，页视图控制器不显示。如何实现pageViewController数据源和委托

import UIKit

数据源

在ViewDidLoad中设置委托和数据源

    override func viewDidLoad() {
        super.viewDidLoad()
         dataSource=self
        delegate = self
        let vc = storyboard?.instantiateViewController(withIdentifier: "vc") as! ViewController
       self.setViewControllers([vc], direction: .forward, animated: true, completion: nil)

     }


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


}

替换

 override func index(ofAccessibilityElement element: Any) -> Int {
        return 0
    }

与

他完成了工作

我打错电话了

 override func index(ofAccessibilityElement element: Any) -> Int {
        return 0
    }

func presentationIndex(for pageViewController: UIPageViewController) -> Int {
        return 0
    }