如何使用相同类型创建多个自定义渲染器？

发布于 2025-01-26 16:08:25 字数 1640 浏览 3 评论 0原文

我想创建一个使用ContentPage类型的页面渲染。我在Android中创建了这一点，并且它正在工作，但是在iOS中，有具有相同类型（contentpage）的自定义页面渲染器。可以将其删除，因为这是从Nuget软件包中进行的，并在不同的上下文中工作。

这是我的代码

[assembly: ExportRenderer(typeof(ContentPage), typeof(CustomPageRenderer))]
namespace AlwinInvoiceGenerator.IOS
{
   using CoreGraphics;
   using UIKit;
   using Xamarin.Forms;
   using Xamarin.Forms.Platform.iOS;

public class CustomPageRenderer : PageRenderer
{
    public override void ViewWillAppear(bool animated)
    {
        base.ViewWillAppear(animated);
        if (Element == null || !(Element is ContentPage basePage) || basePage.BindingContext == null ||
            !(basePage.BindingContext is BaseViewModel baseViewModel))
        {
            return;
        }

        SetCustomBackButton(baseViewModel);
    }

    protected override void OnElementChanged(VisualElementChangedEventArgs e)
    {
        base.OnElementChanged(e);
        OverrideUserInterfaceStyle = UIUserInterfaceStyle.Light;
    }

    private void SetCustomBackButton(BaseViewModel baseViewModel)
    {
        var fakeButton = new UIButton {Frame = new CGRect(0, 0, 50, 40), BackgroundColor = UIColor.Clear};
        fakeButton.TouchDown += (sender, e) =>
        {
            baseViewModel.OnBackButtonClicked();
        };

        NavigationController?.NavigationBar.AddSubview(fakeButton);
    }
}

，似乎没有注册，这就是为什么不打电话。我还有另一个页面渲染器，如果我删除了此行，则在汇编中注册

[assembly: ExportRenderer(typeof(ContentPage), typeof(IOSToolbarExtensions.iOS.Renderers.IOSToolbarExtensionsContentPageRenderer), Priority = short.MaxValue)]

，然后上面的代码在工作，而不是两个。请帮忙

原文

I wanted to create a page render with ContentPage type. I created so in android and it is working but in IOS there has custom page renderer with same type (ContentPage). It can be removed as this was from nuget package and working on different context.

Here is my code

[assembly: ExportRenderer(typeof(ContentPage), typeof(CustomPageRenderer))]
namespace AlwinInvoiceGenerator.IOS
{
   using CoreGraphics;
   using UIKit;
   using Xamarin.Forms;
   using Xamarin.Forms.Platform.iOS;

public class CustomPageRenderer : PageRenderer
{
    public override void ViewWillAppear(bool animated)
    {
        base.ViewWillAppear(animated);
        if (Element == null || !(Element is ContentPage basePage) || basePage.BindingContext == null ||
            !(basePage.BindingContext is BaseViewModel baseViewModel))
        {
            return;
        }

        SetCustomBackButton(baseViewModel);
    }

    protected override void OnElementChanged(VisualElementChangedEventArgs e)
    {
        base.OnElementChanged(e);
        OverrideUserInterfaceStyle = UIUserInterfaceStyle.Light;
    }

    private void SetCustomBackButton(BaseViewModel baseViewModel)
    {
        var fakeButton = new UIButton {Frame = new CGRect(0, 0, 50, 40), BackgroundColor = UIColor.Clear};
        fakeButton.TouchDown += (sender, e) =>
        {
            baseViewModel.OnBackButtonClicked();
        };

        NavigationController?.NavigationBar.AddSubview(fakeButton);
    }
}

It seems it not registering and that is why not calling.
I have another page renderer that is register in assembly

[assembly: ExportRenderer(typeof(ContentPage), typeof(IOSToolbarExtensions.iOS.Renderers.IOSToolbarExtensionsContentPageRenderer), Priority = short.MaxValue)]

If I removed this line then above code is working but not two in the same time.
Please help

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