ios - WatchConnectivity:尽管更新了上下文，但 didReceiveApplicationContext 永远不会被调用

Question

我遇到了以下问题:我能够在 iPhone 和 Watch(模拟器和真实设备)上启动 WCSessions，并且可以很好地使用 sendMessage 方法。我知道 updateApplicationContext 需要发送更新的字典，因此我添加了一个 uuid 以便进行调试:

context = ["user":id,"messageId": UUID().uuidString]

调用该方法时不会抛出任何错误，但在 watch 端 didReceiveApplicationContext 永远不会被调用，并且 receiveApplicationContext 字典始终保持为空。在阅读了很多类似的代码示例和文档后，我看不出我错在哪里。

我正在使用 XCode 12.5、iOS 14.5 和 watchOS 7.4 进行构建

下面是处理 WCSession 的 iOS 代码，上下文是在另一个方法中设置的，并使用 sendMessage 成功传输，但不使用 updateApplicationContext:

import WatchConnectivity

public class CDVSettings : CDVPlugin, WCSessionDelegate {

var wcSession : WCSession! = nil

var didSendMessage:Bool = false

var context: [String : Any] = [:] {
    didSet {
        debugPrint("context didSet:", self.context)
        debugPrint("WCSession.isPaired: \(wcSession.isPaired), WCSession.isWatchAppInstalled: \(wcSession.isWatchAppInstalled)")
        if wcSession.activationState == WCSessionActivationState.activated {
            do {
                debugPrint("updateApplicationContext is called")
                self.didSendMessage=true
                try wcSession.updateApplicationContext(self.context)
            }
            catch let error as NSError {
                debugPrint(error.localizedDescription)
            }
            catch {}
            wcSession.sendMessage(self.context, replyHandler: { reply in
                print("Got reply: \(reply)")
            }, errorHandler: { error in
                print("error: \(error)")
            })
        } else {
            print("activationState is not activated")
            wcSession.activate()
        }
    }
}

public func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
    print("activationDidCompleteWith activationState:\(activationState) error:\(String(describing: error))")
}

public func sessionDidBecomeInactive(_ session: WCSession) {
    
}

public func sessionDidDeactivate(_ session: WCSession) {

}

@objc(pluginInitialize)
public override func pluginInitialize() {
    wcSession = WCSession.default
    wcSession.delegate = self
    wcSession.activate()
}

[...]

}

这是 watch 部分:

    import WatchConnectivity
    
    class ConnectivityRequestHandler: NSObject, ObservableObject, WCSessionDelegate {
    
    var session = WCSession.default

    override init() {
        super.init()
        session.delegate = self
        session.activate()
        debugPrint("ConnectivityRequestHandler started with session", session)
    }
        
    // MARK: WCSession Methods
    
    func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
        debugPrint(error)
        debugPrint("session is reachable:",session.isReachable)
        debugPrint("last received application context:",session.receivedApplicationContext)
    }
    
    
   func session(_ session: WCSession, didReceiveMessage message: [String: Any], replyHandler: @escaping ([String: Any]) -> Void) {
        debugPrint("didReceiveMessage: \(message)")
        replyHandler(["message received": Date()])
    }
    
    func session(_ session: WCSession, didReceiveMessageData messageData: Data, replyHandler: @escaping (Data) -> Void) {
        debugPrint("didReceiveMessageData: \(messageData)")
    }
    
    func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String : Any]) {
        debugPrint("did receive application context")
        debugPrint(applicationContext)
            if let id = applicationContext["user"] as? [String]{
                debugPrint("\(id)")
                UserDefaults.standard.set(id, forKey: "user")
            }
        }

}

iOS上对应的日志

"context didSet:" ["user": "0e4a28b5-f8a0-40a5-942d-5f13b610a93a", "messageId": "8A78246C-91E6-48DC-B55D-4F4EBC761211"] "WCSession.isPaired: true, WCSession.isWatchAppInstalled: true" "updateApplicationContext is called" Got reply: ["message received": 2021-09-03 08:31:54 +0000]

在 watchOS 上

"ConnectivityRequestHandler started with session" <WCSession: 0x600003be0b40, hasDelegate: YES, activationState: 0> nil "session is reachable:" true "last received application context:" [:] "didReceiveMessage: ["user": 0e4a28b5-f8a0-40a5-942d-5f13b610a93a, "messageId": 8A78246C-91E6-48DC-B55D-4F4EBC761211]"

我做错了什么？非常感谢您的帮助。

Answer 1

对于那些在研究过程中遇到问题的人来说，这不是真正的解决方案，而是我(现在)与其他人分享的观察结果(请参阅上面的评论):使用真实设备，它有效 正如预期的那样，但在此过程中您可能需要重新启动它们。在模拟器中，似乎不同的方法可能有效，而其他方法可能无效，而且甚至因开发人员而异。