您可以参考下面的URL stackoverflow

extension Bundle {

 static let externalURLSchemes: [String] = {
    guard let urlTypes = main.infoDictionary?["CFBundleURLTypes"] as? [[String: Any]] else {
        return []
    }

    var result: [String] = []
    for urlTypeDictionary in urlTypes {
        guard let urlSchemes = urlTypeDictionary["CFBundleURLSchemes"] as? [String] else { continue }
        guard let externalURLScheme = urlSchemes.first else { continue }
        result.append(externalURLScheme)
    }

    return result
 }()

}

字符串

会是这样的（丑陋的）：

var arr = (NSBundle.MainBundle.InfoDictionary["CFBundleURLTypes"] as NSMutableArray);
var urlTypes = arr.GetItem<NSDictionary>(0);
var schemes = urlTypes.ObjectForKey(new NSString("CFBundleURLSchemes")) as NSMutableArray;
var scheme = schemes.GetItem<NSString>(0).ToString();

字符串

您可能需要为您的应用程序和扩展程序创建一个App Group，这将允许您将plist或任何其他文件放置到磁盘上的共享位置，以便在两个应用程序之间共享。
下面有一篇文章解释了如何做到这一点：https://learn.microsoft.com/en-us/xamarin/ios/app-fundamentals/file-system#configure-an-app-group

extension Bundle {
    static let externalURLSchemes: [String] = {
        guard let urlTypes = main.infoDictionary?["CFBundleURLTypes"] as? [[String: Any]],
              let urlSchemesDictionary = urlTypes.first(where: { $0["CFBundleURLSchemes"] != nil }),
              let urlSchemes = urlSchemesDictionary["CFBundleURLSchemes"] as? [String]
        else {
            return []
        }
        return urlSchemes
    }()
}

字符串