Question

我将页面视图控制器嵌入到容器视图中。包含“容器”视图的View控制器不是主View控制器，因此我的程序崩溃了。

import UIKit

class CarsSwipe: UIPageViewController,  UIPageViewControllerDataSource, UIPageViewControllerDelegate {

  lazy var viewControllersList:[UIViewController] = {
    let sb = UIStoryboard(name: "main", bundle: nil).instantiateViewController(withIdentifier: "carsSwipe")

    let vc1 = sb.instantiateViewController(withIdentifier: "blueView")
    let vc2 = sb.instantiateViewController(withIdentifier: "orangeView")
    let vc3 = sb.instantiateViewController(withIdentifier: "blackView")
    return [vc1, vc2, vc3]
   }()

  func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {

    guard let vcIndex = viewControllersList.firstIndex(of:  viewController) else {return nil}

    let previousIndex = vcIndex - 1
    guard previousIndex >= 0 else {return nil}
    guard viewControllersList.count > previousIndex  else {return  nil}

    return viewControllersList[previousIndex]
   }

  func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
    guard let vcIndex = viewControllersList.firstIndex(of: viewController) else {return nil}
    let nextIndex = vcIndex + 1
    guard viewControllersList.count != nextIndex else {return nil}
    guard viewControllersList.count > nextIndex  else {return nil}
    return viewControllersList[nextIndex]
  }

  override func viewDidLoad() {
    super.viewDidLoad()

    self.delegate = self
    self.dataSource = self

    if let firsViewControlller = viewControllersList.first {
      self.setViewControllers([firsViewControlller], direction: .forward, animated: true, completion: nil)
    }
  }

}

我希望PageViewController在View控制器内的容器中滚动

Answer 1

此行中的错误：

let sb = UIStoryboard(name: "main", bundle: nil).instantiateViewController(withIdentifier: "carsSwipe")

删除.instantiateViewController(withIdentifier: "carsSwipe")，并应成功编译。

下面代码中的sb不是UIStoryboard，而是视图控制器：

let vc1 = sb.instantiateViewController(withIdentifier: "blueView")
let vc2 = sb.instantiateViewController(withIdentifier: "orangeView")
let vc3 = sb.instantiateViewController(withIdentifier: "blackView")

为故事板使用“主要”失败，因为View控制器不是主要故事板

1 个答案: