c# - "Can' t 在 Xamarin Forms 项目中找到“NS*Types(例如 NSFileManager 或 NSUrl)

Question

我在 Xamarin Forms 中遇到诸如 NSFileManager 和 NSUrl 之类的错误“未找到”。这些是我在我的类(class)中遇到这些错误的导入:

using System;
using System.IO;
using System.Reflection;
using DrinkUp.Controls;
using DrinkUp.iOS.Renderers;
using MediaPlayer;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

我正在使用的类位于 DrinkUp.iOS 中。无论何时何地我输入带有 NS 前缀的东西，它都会说找不到对象。有人可以告诉我我在这里做错了什么吗？

这是我的全类

using System;
using System.IO;
using System.Reflection;
using DrinkUp.Controls;
using DrinkUp.iOS.Renderers;
using MediaPlayer;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(Video), typeof(VideoRenderer))]
namespace DrinkUp.iOS.Renderers
{
public class VideoRenderer : ViewRenderer<Video, UIView>
{
MPMoviePlayerController videoPlayer;
object notification = null;

    void InitVideoPlayer()
    {
        var path = Path.Combine(NSBundle.MainBundle.BundlePath, Element.Source);

        if (!NSFileManager.DefaultManager.FileExists(path)) {
            Console.WriteLine("Video not exist");
            videoPlayer = new MPMoviePlayerController();
            videoPlayer.ControlStyle = MPMovieControlStyle.None;
            videoPlayer.ScalingMode = MPMovieScalingMode.AspectFill;
            videoPlayer.RepeatMode = MPMovieRepeatMode.One;
            videoPlayer.View.BackgroundColor = UIColor.Clear;
            SetNativeControl(videoPlayer.View);
            return;
        }

        // Load the video from the app bundle.
        NSUrl videoURL = new NUrl(path, false);

        // Create and configure the movie player.
        videoPlayer = new MPMoviePlayerController(videoURL);

        videoPlayer.ControlStyle = MPMovieControlStyle.None;
        videoPlayer.ScalingMode = MPMovieScalingMode.AspectFill;
        videoPlayer.RepeatMode = Element.Loop ? MPMovieRepeatMode.One : MPMovieRepeatMode.None;
        videoPlayer.View.BackgroundColor = UIColor.Clear;
        foreach (UIView subView in videoPlayer.View.Subviews) {
            subView.BackgroundColor = UIColor.Clear;
        }

        videoPlayer.PrepareToPlay();
        SetNativeControl(videoPlayer.View);
    }
}

Answer 1

第一个评论起作用了，我必须从 Foundation 获取 NS 类型。像 Foundation.NSUrl 等。这解决了我的问题。