如何在情节提要中使用 pdf 作为图像？

Question

我想展示一张图片。 我知道的简单方法是：在界面上放置一个图像视图，然后选择属性检查器并输入我的文件名（对于放入我的项目中的文件）。这适用于我的图片的 png 版本。

但我想在这里使用 pdf 文件。可能吗？在屏幕上显示我的 pdf 文件的最佳方式是什么？

Answer 1

显示 PDF 的最佳选择是在 Web 视图中。像添加图像视图一样添加 Web 视图并将插座连接到它。然后，在代码中，当视图将被显示时，调用：

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"MyPDF" ofType:@"pdf"];
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:filePath]]];

Answer 2

除了网页视图，如果你想呈现一个 PDF 并让用户与之交互，那么你可以使用文档交互控制器。见Document Interaction Programming Topics。

例如：

- (IBAction)didTouchUpInsidePDFButton:(id)sender
{
    NSURL *url = [[NSBundle mainBundle] URLForResource:@"sample" withExtension:@"pdf"];
    UIDocumentInteractionController *controller = [UIDocumentInteractionController interactionControllerWithURL:url];
    controller.delegate = self;

    [controller presentPreviewAnimated:YES];
}

- (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller
{
    return self;

    // or if you want to push to the PDF preview, and the current view controller 
    // already has navigation controller, you can:
    //
    // return self.navigationController;
}

Answer 3

       public override void ViewDidLoad()
    {
        base.ViewDidLoad();
        if (ViewModel == null)
            return;
        FirstViewModel.globalpref = "Not set yet";
        FirstViewModel.islogin = "no";
        UITabBar.Appearance.SelectedImageTintColor = UIColor.Purple;
        UITabBar.Appearance.BackgroundColor = UIColor.FromRGB(193, 168, 210);
        UITabBar.Appearance.BarTintColor = UIColor.FromRGB(193, 168, 210);
        NewsViewModel newsViewModel = (NewsViewModel)Mvx.IocConstruct(typeof(NewsViewModel));
        VideoHomeViewModel videoViewModel = (VideoHomeViewModel)Mvx.IocConstruct(typeof(VideoHomeViewModel));
        MatchViewModel matchViewModel = (MatchViewModel)Mvx.IocConstruct(typeof(MatchViewModel));
        InterestsViewModel iViewModel = (InterestsViewModel)Mvx.IocConstruct(typeof(InterestsViewModel));
        LocationsViewModel lViewModel = (LocationsViewModel)Mvx.IocConstruct(typeof(LocationsViewModel));
        TicketViewModel ticketViewModel = (TicketViewModel)Mvx.IocConstruct(typeof(TicketViewModel));
        var viewControllers = new UIViewController[]
        {
            CreateTabFor("", "News",  newsViewModel),
            CreateTabFor("", "ivideo", videoViewModel),
            CreateTabFor("", "match_center", matchViewModel),
            CreateTabFor("", "ivideo", ticketViewModel),
        };
        ViewControllers = viewControllers;
        SelectedViewController = ViewControllers[0];
    }
    private int _createdSoFarCount = 0;
    private UIViewController CreateTabFor(string title, string imageName, IMvxViewModel viewModel)
    {
        var controller = new UINavigationController();
        controller.NavigationBar.Translucent = true;
        controller.NavigationBar.BackgroundColor = UIColor.Clear;
        controller.NavigationBar.TintColor = UIColor.White;
        controller.NavigationBar.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
        controller.NavigationBar.ShadowImage = new UIImage();
        controller.NavigationItem.Title = "test";
        var screen = this.CreateViewControllerFor(viewModel) as UIViewController;
        SetTitleAndTabBarItem(screen, title, imageName);
        controller.PushViewController(screen, true);
        return controller;
    }
    private void SetTitleAndTabBarItem(UIViewController screen, string title, string imageName)
    {
        screen.Title = title;
        screen.TabBarItem = new UITabBarItem(title, UIImage.FromBundle(imageName),
                                             _createdSoFarCount);
      //  UIImage.FromBundle("CameraIcon").Scale(new CoreGraphics.CGSize(this.TabBar.Bounds.Height - 20, this.TabBar.Bounds.Height - 20));
        _createdSoFarCount++;
    }

这仅在 Mvvmcross.iOS 中测试过