如何检查某些特定的应用程序是否已安装在我的设备中或不使用xamarin表单在ios中安装？

Question

我想找到一些特定的应用程序已经安装或者没有安装在xamarin表单中（我想在android和ios中实现）。

如果设备中未安装应用程序，则启用“安装”按钮。在安装按钮单击事件直接itunes应该打开。我也想搜索版本号。

我已经在xamarin表单中获得了相同的android功能但是我需要ios的帮助。

我的安卓代码：

public class IsAppInstalled : IIsAppInstalled
    {
        public string AppVersion { get; set; }
        public void NavigatePage(string Package_Name)
        {
            try
            {
                var intent = new Intent(Intent.ActionView, Android.Net.Uri.Parse("market://details?id=" + Package_Name));
                // we need to add this, because the activity is in a new context.
                // Otherwise the runtime will block the execution and throw an exception
                intent.AddFlags(ActivityFlags.NewTask);

                Application.Context.StartActivity(intent);
            }
            catch (ActivityNotFoundException)
            {
                var intent = new Intent(Intent.ActionView, Android.Net.Uri.Parse("http://play.google.com/store/apps/details?id=" + Package_Name));
                // we need to add this, because the activity is in a new context.
                // Otherwise the runtime will block the execution and throw an exception
                intent.AddFlags(ActivityFlags.NewTask);

                Application.Context.StartActivity(intent);
            }
        }

        bool IIsAppInstalled.IsAppInstalled(string Appname)
        {
            bool IsInstallflag = false;

            var flag = PackageInfoFlags.Activities;
            var apps = Application.Context.PackageManager.GetInstalledApplications(flag);
            try
            {
                foreach (var app in apps)
                {
                    var appInfo = Application.Context.PackageManager.GetApplicationInfo(app.PackageName, 0);
                    var appLabel = Application.Context.PackageManager.GetApplicationLabel(appInfo);
                    var versionNumber = Application.Context.PackageManager.GetPackageInfo(app.PackageName, 0).VersionName;
                    //var appVersion=Application.Context.PackageManager.
                    if (appLabel.ToLower().Contains(Appname.ToLower()))
                    {
                        //var builder = new AlertDialog.Builder(this);
                        //builder.SetTitle("Found it!");
                        //builder.SetMessage(appLabel + " installed at: " + app.SourceDir);
                        //builder.Show();
                        IsInstallflag = true;
                        //MyVersionName(versionNumber);
                        AppVersion = versionNumber;
                        break;
                    }
                }
                return IsInstallflag;
            }
            catch (PackageManager.NameNotFoundException e)
            {
                return IsInstallflag;
            }

        }
    }

我使用依赖注入使用了这些类。这段代码完美无缺。

如何在xamarin表单中为ios实现相同的功能？