Question

我正在尝试以编程方式在子视图中创建页面视图。但是，当我将UIPageViewController的dataSource设置为superviewcontroller时，我收到此错误：

-[UIView scrollView]: unrecognized selector sent to instance 0x7fc223ea8300
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView scrollView]: unrecognized selector sent to instance 0x7fc223ea8300'

这是我的代码：

import UIKit
class MainVC: UIViewController, UIPageViewControllerDataSource {
    private var pages: [UIViewController]
    private let pageVC: UIPageViewController
    init() {
        pages = [UIViewController]()
        for i in 0...1 {
            let vc = UIViewController()
            vc.view = MyUIViewSubclass(index: i)
            pages.append(vc)
        }
        pageVC = UIPageViewController(transitionStyle: .Scroll, navigationOrientation: .Horizontal, options: nil)
        pageVC.view = UIView()
        pageVC.view.translatesAutoresizingMaskIntoConstraints = false
        super.init(nibName: nil, bundle: nil)
        pageVC.dataSource = self //Breakpoints indicate that this is when the exception occurs
        view.addSubview(pageVC.view)
        //...Autolayout...
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
        return pages[0]
    }
    func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
        return pages[1]
    }
}

提前致谢。

Answer 1

pageVc.view有一个名为scrollview的ibaction未在视图控制器中声明，您需要从连接检查器中删除ibaction

Answer 2

好的，所以我遇到了与您相同的问题，并且发现了为什么会这样。由于您在pageVC.view = UIView()行所在的行而发生错误。 UIPageViewController的视图具有滚动视图，在其中可以进行VC之间的滚动魔术。通过为其设置一个空的UIView，您将其删除，从而使其无法工作。如果您想更改其视图的外观，则应直接进行操作，而不要设置其他视图。

设置UIPageViewController.dataSource时发送到实例的无法识别的选择器？

2 个答案: