Swift 2：如何保持iOS和watchOS2应用与WatchConnectivity同步？

Question

我在 iOS 和 WatchOS 上制作了一个计数应用程序，我希望应用程序能够同步。当我指望 WatchOS 时，iOS 标签上的数字必须与 WatchOS 上的数字相同，而当我指望 iOS 时，WatchOS 标签上的数字必须与一个 iOS 相同。这两个中的一个正在工作，当我指望 iOS 时，WatchOS 上的标签正在改变，这意味着它正在工作，但是当我指望 WatchOS 时，iOS 的标签没有改变。

代码如下：

ViewController.swift

import UIKit
import WatchConnectivity


class ViewController: UIViewController, WCSessionDelegate {

var watchSession : WCSession?

var counter: Int {
    return NSUserDefaults().integerForKey("counter")
}

@IBAction func resetButton(sender: AnyObject) {
    NSUserDefaults().removeObjectForKey("counter")
    countedLabel.text = "\(counter)"

    if let message : String = countedLabel.text {
        do {
            try watchSession?.updateApplicationContext(
                ["message" : message]
            )
        } catch let error as NSError {
            NSLog("Updating the context failed: " + error.localizedDescription)
        }
    }
}


@IBOutlet var countedLabel: UILabel!

@IBAction func countUpButton(sender: AnyObject) {
    NSUserDefaults().setInteger(counter+1, forKey: "counter")
    countedLabel.text = "\(counter)"



    if let message : String = countedLabel.text {
        do {
            try watchSession?.updateApplicationContext(
                ["message" : message]
            )
        } catch let error as NSError {
            NSLog("Updating the context failed: " + error.localizedDescription)
        }
    }
}

func session(session: WCSession, didReceiveApplicationContext applicationContext: [String : AnyObject]){
    let message : String = applicationContext["message"] as! String
    NSUserDefaults().setInteger(Int(message)!, forKey: "counted")
    countedLabel.text = ("\(message)")
}



override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    if(WCSession.isSupported()){
        watchSession = WCSession.defaultSession()
        watchSession!.delegate = self
        watchSession!.activateSession()
    }
}

InterfaceController.swift

import WatchKit
import Foundation
import WatchConnectivity


class InterfaceController: WKInterfaceController, WCSessionDelegate {

var watchSession : WCSession?

var counted: Int {
    return NSUserDefaults().integerForKey("counted")
}


@IBAction func resetButton() {
    NSUserDefaults().removeObjectForKey("counted")
    countedLabel.setText("\(counted)")

    if let message : String = "\(counted)"  {
        do {
            try watchSession?.updateApplicationContext(
                ["message" : message]
            )
        } catch let error as NSError {
            NSLog("Updating the context failed: " + error.localizedDescription)
        }
    }
}

@IBOutlet var countedLabel: WKInterfaceLabel!

@IBAction func countUpButton() {
    NSUserDefaults().setInteger(counted+1, forKey: "counted")
    countedLabel.setText("\(counted)")

    if let message : String = "\(counted)"  {
        do {
            try watchSession?.updateApplicationContext(
                ["message" : message]
            )
    } catch let error as NSError {
            NSLog("Updating the context failed: " + error.localizedDescription)
        }
    }
}

func session(session: WCSession, didReceiveApplicationContext applicationContext: [String : AnyObject]){
    let message : String = applicationContext["message"] as! String
    NSUserDefaults().setInteger(Int(message)!, forKey: "counted")
    countedLabel.setText(message)
}

override func awakeWithContext(context: AnyObject?) {
    super.awakeWithContext(context)

    // Configure interface objects here.
}

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

    if(WCSession.isSupported()){
        watchSession = WCSession.defaultSession()
        // Add self as a delegate of the session so we can handle messages
        watchSession!.delegate = self
        watchSession!.activateSession()
    }
}

问题出在InterfaceController.swift这部分代码。

if let message : String = "\(counted)"  {
        do {
            try watchSession?.updateApplicationContext(
                ["message" : message]
            )
        } catch let error as NSError {
            NSLog("Updating the context failed: " + error.localizedDescription)
        }
    }

虽然在 ViewController.swift (iOS) 正在工作并且那部分代码是：

if let message : String = countedLabel.text {
        do {
            try watchSession?.updateApplicationContext(
                ["message" : message]
            )
        } catch let error as NSError {
            NSLog("Updating the context failed: " + error.localizedDescription)
        }
    }

那么，我可以在 InterfaceController.swift (WatchOS) 上使用什么来代替我在 [=45 上使用的这个 if let message : String = "\(counted)" { =] (iOS) 这个 if let message : String = countedLabel.text ?

有关更多信息，您可以查看此项目：Counting App（<- URL 到项目）

Answer 1

我发现了问题，我无法对答案发表评论，因为评论太长了，所以我做了一个新的答案。问题出在 ViewController.swift 而不是使用

func session(session: WCSession, didReceiveApplicationContext applicationContext: [String : AnyObject]){
let message : String = applicationContext["message"] as! String
NSUserDefaults().setInteger(Int(message)!, forKey: "counted")
countedLabel.text = ("\(message)") }

应该使用

func session(session: WCSession, didReceiveApplicationContext applicationContext: [String : AnyObject]){
    dispatch_async(dispatch_get_main_queue()) { [unowned self] in
        let message : String = applicationContext["message"] as! String
        NSUserDefaults().setInteger(Int(message)!, forKey: "counter")
        self.countedLabel.text = ("\(message)")
    }
}

Swift 2：如何保持iOS和watchOS2应用与WatchConnectivity同步？

Swift 2: How to keep iOS and watchOS2 apps synchronized with WatchConnectivity?

swift

ios9

swift2

watchos-2

watchconnectivity