检查 Apple Watch 是否已连接

问：

我想检查Apple Watch是否连接到iPhone，然后检查remotePaymentPass是否可用于Apple Pay。然而，这不是运气。它说找不到 wcsessiondelegate。有人可以帮忙吗？

import WatchConnectivity

protocol PairedDeviceRepository {
    func hasPairedWatchDevices() -> Bool
}

class PairedDeviceRepositoryImpl: NSObject, PairedDeviceRepository {
    func hasPairedWatchDevices() -> Bool {
        guard WCSession.isSupported() else { return false }
        let session = WCSession.default
        session.delegate = self
        session.activate()
        print("Watch isPaired: \(session.isPaired) ")
        return session.isPaired
    }
}

extension PairedDeviceRepositoryImpl: WCSessionDelegate {
    // WCSessionDelegate methods
    func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
        if session.isPaired {
            print("Watch is paired")
        } else {
            print("Watch is not paired")
        }
    }
    
    func sessionDidDeactivate(_ session: WCSession) {
    }

    func sessionDidBecomeInactive(_ session: WCSession) {
    }
}