将文本显示为 swift 中的书页

Question

我正在尝试在 swift 中制作一个 epub reader 应用程序。我解析一个 epub 文件并获取所有元数据和 xhtml。然后，如果用户想要阅读这本书，我会将这本书的所有文本附加到 uitextview。是否有任何可能的解决方案可以像 ios 中的本机图书应用程序那样在书页（而不是滚动视图）中显示文本？

Answer 1

请在您的 post 中加入 minimal, reproducible example。也就是说，以下是 Apple 用于翻页的书籍格式示例。

class ViewController: UIViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource {
    let viewControllers: [UIViewController] = {
        var viewControllers = [ContentViewController]()
        for index in 1...10 {
            let textView = UITextView()
            textView.text = "Page \(index)"
            let contentVC = ContentViewController(textView: textView)
            viewControllers.append(contentVC)
        }
        return viewControllers
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()

        let pageVC = UIPageViewController(transitionStyle: .pageCurl, navigationOrientation: .horizontal, options: nil)
        pageVC.dataSource = self
        pageVC.delegate = self
        pageVC.setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)

        addChild(pageVC)
        self.view.addSubview(pageVC.view)
        pageVC.view.frame = self.view.bounds
        pageVC.didMove(toParent: self)
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        guard var index = viewControllers.firstIndex(of: viewController), index > 0 else { return nil }
        index -= 1
        return viewControllers[index]
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        guard var index = viewControllers.firstIndex(of: viewController), index < viewControllers.count else { return nil }
        index += 1
        return viewControllers[index]
    }
}

class ContentViewController: UIViewController {
    var textView = UITextView()
    init(textView: UITextView) {
        self.textView = textView
        super.init(nibName: nil, bundle: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewDidLoad() {
        self.view.addSubview(textView)
        self.textView.bounds = self.view.frame
    }
}

至于解析 ePub，你必须解压缩并解析 XML。

将文本显示为 swift 中的书页

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uitextview

epub