watchSession.sendMessage在模拟器上工作正常，超时IRL

Question

我编写了两个应用程序，首先使用transferUserInfo，这导致了太多的延迟（我相信是因为它在后台发送内容）。我切换到sendMessage，对结果非常满意（响应时间更快）。尝试在我的真实iPhone和Apple Watch上运行该应用程序时，我收到了Transfer timed out.，这是完整的代码和其中一个调试示例：

iPhone：

//  ViewController.swift

import UIKit
import Foundation
import WatchConnectivity

class WatchManager: UIViewController, WCSessionDelegate {

    var counter = 0

    var watchSession: WCSession? {
        didSet {
            if let session = watchSession {
                session.delegate = self
                session.activate()
            }
        }
    }

    override func viewDidLoad(){
        super.viewDidLoad()

        watchSession = WCSession.default

    }


    private func sendDict(_ dict: [String: Any]) {
        self.watchSession?.sendMessage(dict, replyHandler: nil, errorHandler: {error in print(error.localizedDescription)})
    }

    @IBOutlet weak var transferButton: UIButton!
    @IBOutlet weak var label: UILabel!

    @IBAction func dataTransfer(_ sender: Any) {
        sendDict(["DataKey": counter])
        counter+=1
        print("sent")
    }

    func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
        print("Session activation did complete")
    }

    public func sessionDidBecomeInactive(_ session: WCSession) {
        print("session did become inactive")
    }

    public func sessionDidDeactivate(_ session: WCSession) {
        print("session did deactivate")
    }

    func session(_ session: WCSession, didReceiveMessage message: [String : Any]) {
        print("phone received app context: ", message)
        if let temperature = message["DataKey"] as? String {
            DispatchQueue.main.async {
                self.transferButton.setTitle(temperature, for: .normal)
                self.label.text=temperature
            }
        }

    }

}

Apple Watch：

//  InterfaceController.swift

import WatchKit
import Foundation
import WatchConnectivity


class InterfaceController: WKInterfaceController {

    var watchSession: WCSession? {
        didSet {
            if let session = watchSession {
                session.delegate = self
                session.activate()
            }
        }
    }


    @IBOutlet weak var temperatureLabel: WKInterfaceButton!

    private func sendDict(_ dict: [String: Any]) {
        self.watchSession?.sendMessage(dict, replyHandler: nil, errorHandler: {error in print(error.localizedDescription)})
    }

    @IBAction func button() {
        let urg = ["DataKey":UUID().uuidString]
        sendDict(urg)
        print("watch sent app context \(urg)")
    }

}

extension InterfaceController: WCSessionDelegate {

    #if os(iOS)
    public func sessionDidBecomeInactive(_ session: WCSession) { }
    public func sessionDidDeactivate(_ session: WCSession) {
        session.activate()
    }
    #endif

    func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
        print("Session activation did complete")
    }

    func session(_ session: WCSession, didReceiveMessage message: [String : Any]) {
        print("watch received app context: ", message)
        if let temperature = message["DataKey"] as? Int {
            self.temperatureLabel.setTitle(String(temperature))
        }

    }

    override func willActivate() {
        // This method is called when watch view controller is about to be visible to user
        super.willActivate()

        watchSession = WCSession.default

    }

    override func didDeactivate() {
        // This method is called when watch view controller is no longer visible
        super.didDeactivate()
    }

}

调试示例：

Session activation did complete
watch sent app context ["DataKey": "AF793FC6-7A16-4D7D-9A3B-D3BB960EC9D9"]
2019-01-13 21:07:43.524717-0800 testApp WatchKit Extension[1240:1178401] [WC] -[WCSession onqueue_handleMessageCompletionWithError:withMessageID:] C385FF5F-5EA1-478B-A930-54066C2F0B0F due to WCErrorCodeTransferTimedOut -> IDSErrorTypeTimedOut -> IDSResponseTimedOut
2019-01-13 21:07:43.525001-0800 testApp WatchKit Extension[1240:1178401] [WC] -[WCSession _onqueue_notifyOfMessageError:messageID:withErrorHandler:] C385FF5F-5EA1-478B-A930-54066C2F0B0F errorHandler: YES with WCErrorCodeTransferTimedOut -> IDSErrorTypeTimedOut -> IDSResponseTimedOut
Transfer timed out.