如何从 Watch App（Watch OS 2）与非活动的 IOS 应用程序通信答案

【问题标题】：How to communicate inactive IOS app from Watch App( Watch OS 2)如何从 Watch App（Watch OS 2）与非活动的 IOS 应用程序通信
【发布时间】：2016-08-24 04:17:38
【问题描述】：

尝试将我的 Watch OS1 应用升级到 Watch OS 2。为 Watch OS 2 创建了新目标。并使用sendMessage:replyHandler:errorHandler 发送/获取来自 IOS 应用的回复。仅当 IOS 应用程序正在运行时，它才能正常工作。如果 Watch app 在 iOS 应用处于非活动状态（Killed State）时尝试通信，则会出现连接错误 7001。如何从 Watch App（Watch OS 2）与非活动 IOS 应用通信？

watch 应用中的这个sendMessage:replyHandler:errorHandler 方法是否会在后台唤醒相应的 iOS 应用并使其可访问？

谢谢。

编辑1：-

iOS APP 的 App Delegate：

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions{

    if ([WCSession isSupported]) {
        WCSession *session = [WCSession defaultSession];
        session.delegate = self;
        [session activateSession];
    }
 return YES;
}
- (void)session:(nonnull WCSession *)session didReceiveMessage:(nonnull NSDictionary<NSString *,id> *)message replyHandler:(nonnull void (^)(NSDictionary<NSString *,id> * __nonnull))replyHandler {

        UIApplication *application = [UIApplication sharedApplication];
        __block UIBackgroundTaskIdentifier identifier = UIBackgroundTaskInvalid;
        dispatch_block_t endBlock = ^ {
            if (identifier != UIBackgroundTaskInvalid) {
                [application endBackgroundTask:identifier];
            }
            identifier = UIBackgroundTaskInvalid;
        };
        identifier = [application beginBackgroundTaskWithExpirationHandler:endBlock];

         if (replyHandler!=nil) {
            replyHandler(resultContainer); // my data dictionary from Iphone app to watch os as reply.
        }

        if (identifier!=UIBackgroundTaskInvalid) {
            [application endBackgroundTask:identifier];
            identifier = UIBackgroundTaskInvalid;
        }
}

观看应用：

- (void)applicationDidFinishLaunching {
    // Perform any final initialization of your application.
    if ([WCSession isSupported]) {
        WCSession *session = [WCSession defaultSession];
        session.delegate = self;
        [session activateSession];
    }
        NSDictionary *context = @{@"APP_LOADING":@"LOADING"};
        [WKInterfaceController reloadRootControllersWithNames:@[WATCH_INTERFACE_LOADING] contexts:@[context]];


        NSDictionary *request = //My Request data;
        [[WCSession defaultSession] sendMessage:request
                                   replyHandler:^(NSDictionary *reply) {
                                       //handle reply from iPhone app here

                                       NSDictionary *resultDict = [reply objectForKey:WATCH_REQUEST_RESULT];
// Use reply from Phone app
                                   }
                                   errorHandler:^(NSError *error) {
                                       //catch any errors here
// Getting error here 7001 Error.
                                   }
         ];

}

【问题讨论】：

标签： ios iphone watchos-2 xcode7.2

【解决方案1】：

由于 activate 方法是异步的，所以在委托方法中使用它，如下所示：

    public func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?){
    print("activationDidCompleteWith")
    if activationState == WCSessionActivationState.activated {
        NSLog("Activated")
        if(WCSession.default().isReachable){

            do {
                try session.updateApplicationContext(
                    [WatchRequestKey : "updateData"]
                )
            }
            catch let error as NSError {
                print("\(error.localizedDescription)")
            }
        }
    }

    if activationState == WCSessionActivationState.inactive {
        NSLog("Inactive")
    }

    if activationState == WCSessionActivationState.notActivated {
        NSLog("NotActivated")
    }
}

【讨论】：