我如何检查watchOS 2是否打开了iPhone上的应用程序,无论应用程序状态如何都能发送NSUserDefaults？

Question

如果打开iPhone上的应用程序,我如何从watchOS 2查看？

我想NSUserDefaults通过手表向iPhone 发送消息sendMessage(当收到消息时能够更新手机上的界面)当两个应用程序都在运行时我想发送NSUserDefaults即使只有watchOS 2应用程序正在运行.

根据我的阅读,我发现了这个:

/** The counterpart app must be reachable for a send message to succeed. */
@property (nonatomic, readonly, getter=isReachable) BOOL reachable;

它总是可以从我检查的内容到达.

Answer 1

可达表示苹果手表和iPhone通过蓝牙或wifi连接.这并不一定意味着iPhone应用程序正在运行.如果可达,则当您尝试从Apple Watch发送消息时,它将在后台启动iPhone应用程序.您需要尽快分配WKSession委托,因为委托方法(sendMessage)很快就会触发.我想你要说的是如果可以的话调用sendMessage,而不是使用transferUserInfo方法.要做到这一点,首先在你的苹果手表上:

func applicationDidFinishLaunching() {
    let session = WCSession.defaultSession()
    session.delegate = self
    session.activateSession()

    // NOTE: This should be your custom message dictionary
    // You don't necessarily call the following code in
    // applicationDidFinishLaunching, but it is here for
    // the simplicity of the example. Call this when you want to send a message.
    let message = [String:AnyObject]()

    // To send your message.
    // You could check reachable here, but it could change between reading the
    // value and sending the message. Instead just try to send the data and if it
    // fails queue it to be sent when the connection is re-established.
    session.sendMessage(message, replyHandler: { (response) -> Void in
        // iOS app got the message successfully
    }, errorHandler: { (error) -> Void in
        // iOS app failed to get message. Send it in the background
        session.transferUserInfo(message)
    })
}

然后,在您的iOS应用中:

// Do this here so it is setup as early as possible so
// we don't miss any delegate method calls
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    self.watchKitSetup()  
    return true
}

func watchKitSetup() {
    // Stop if watch connectivity is not supported (such as on iPad)
    if (WCSession.isSupported()) {
        let session = WCSession.defaultSession()
        session.delegate = self
        session.activateSession()
    }
}

func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -> Void) {
    // Handle the message from the apple watch...
    dispatch_async(dispatch_get_main_queue()) {
        // Update UI on the main thread if necessary
    }
}

func session(session: WCSession, didReceiveUserInfo userInfo: [String : AnyObject]) {
    // Handle the message from the apple watch...
    dispatch_async(dispatch_get_main_queue()) {
        // Update UI on the main thread if necessary
    }
}