如何在 Swift 中将 XPC 自定义类列入白名单

我有一对Swift Xcode目标，它们实现了XPC主应用程序+服务应用程序模式.我了解了如何来回传递自定义类，可以作为远程对象方法的参数，也可以作为"返回值"(即，完成处理程序/应答块的参数).这一切都很好.

现在，我正在try 添加一个新的折痕:使用服务中我的自定义类的NSArray调用完成处理程序，以将它们返回到主应用程序.我从Apple's docs(和this Obj-C answer)了解到，我需要在接收端的NSXPCInterface上将我的自定义类列入白名单.但我不知道如何在Swift 做到这一点.所有在线和文档中的示例都在Obj-C中，我很难在Swift中找到正确的对等项.

具体来说，这里是我的自定义类的简化版本:

@objc(PartialSnapshot) public class PartialSnapshot : NSObject, NSSecureCoding {
    public var rawPaths: [String]

    public static var supportsSecureCoding: Bool = true
    
    public func encode(with coder: NSCoder) {
        coder.encode(rawPaths, forKey: "rawPaths")
    }

    public required init?(coder: NSCoder) {
        guard
            let rawPaths = coder.decodeObject(of: [NSArray.self], forKey: "rawPaths") as? [String]
        else {
            NSLog("PartialSnapshot: returning nil from init?(coder: NSCoder)")
            return nil
        }
        self.rawPaths = rawPaths
    } 
}

@objc(ReadAllSnapshotsRpcReturnType) public class ReadAllSnapshotsRpcReturnType : NSObject, NSSecureCoding {
    var partials: [PartialSnapshot]

    public static var supportsSecureCoding: Bool = true

    public func encode(with coder: NSCoder) {
        coder.encode(partials, forKey: "partials")
    }

    public required init?(coder: NSCoder) {
        guard
            let partials = coder.decodeObject(of: [NSArray.self], forKey: "partials") as? [PartialSnapshot]
        else {
            NSLog("ReadAllSnapshotsRpcReturnType: returning nil from init?()")
            return nil
        }
        self.partials = partials
    }
}

远程对象协议上的我的方法签名:

@objc func ReadAllSnapshotsRpc(then completion: @escaping (ReadAllSnapshotsRpcReturnType?, Error?) -> Void)

我想我大概知道从this Objective-C answer开始我需要做什么.当我在主应用程序中创建我的NSXPCConnection时，我需要添加一行，如下面的第三行:

let connection = NSXPCConnection(machServiceName: SecurityProxyConstants.domain, options: .privileged)
connection.remoteObjectInterface = NSXPCInterface(with: SecurityProxyProtocol.self)
connection.remoteObjectInterface?.setClasses(ReadAllSnapshotsRpcReturnType.self, for: #selector(PartialSnapshot.self), argumentIndex: 0, ofReply: true)

然而，我显然没有完全正确的语法，我try 过的许多语法变体也没有编译.有人能给我指出正确的方向吗？

EDIT:这是我遇到的运行时错误，这让我相信我需要列入白名单:

<NSXPCConnection: 0x600003f5b0c0> connection to service with pid 9679 named com.mycompany.MyApp.SecurityProxy: Exception caught during decoding of reply to message 'ReadAllSnapshotsRpcWithThen:', dropping incoming message and calling failure block.

Ignored Exception: Exception while decoding argument 0 (#1 of invocation):
<NSInvocation: 0x600001bdb740>
return value: {v} void
target: {@?} 0x0 (block)
argument 1: {@} 0x0
argument 2: {@} 0x0

Exception: value for key 'NS.objects' was of unexpected class 'PartialSnapshot' (0x10c7abe00) [/Users/mwg/Library/Developer/Xcode/DerivedData/MyApp-brumjpaxvoxfmjchpswlfnbsarho/Build/Products/Debug/MyApp.app].
Allowed classes are:
 {(
    "'NSArray' (0x7ff8485798a0) [/System/Library/Frameworks/CoreFoundation.framework]"
)}