哪里最好使用Watch Connectivity调用updateApplicationContext？

Question

一些详细介绍Watch Connectivity的好博文(http://www.kristinathai.com/watchos-2-tutorial-using-application-context-to-transfer-data-watch-connectivity-2/和http:// natashatherobot .com/watchconnectivity-application-context /)使用简单的应用程序示例,当您点击iPhone上的UI时,将数据发送到手表.

我的应用程序仅列出从我的iPhone应用程序中的数据,所以我并不需要立即发送数据,我只是想送它时,应用程序加载或进入后台......为此我做了updateApplicationContext的didFinishLaunching和didEnterBackground.. .然后我的监视接口控制器中的dataSource委托非常发现触发...特别是只能在模拟器上加载,而不会在设备上加载.是否有更好的时间和地点推送信息？

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    WatchSessionManager.sharedManager.startSession()      
    do {
         try WatchSessionManager.sharedManager.updateApplicationContext(["peopleDict" : peopleDict])                                        
    } catch {
        print(error)
    }
     return true
}

func applicationDidEnterBackground(application: UIApplication) {     
     do {
         try WatchSessionManager.sharedManager.updateApplicationContext(["peopleDict" : peopleDict])                                      
     } catch {
         print(error)
     }
}

下面是我WatchSessionManager以前打电话给activiateSession我extensionDelegate的appliciationDidFinishLaunching

import WatchConnectivity

protocol DataSourceChangedDelegate {
    func dataSourceDidUpdate(dataSource: DataSource)
}


class WatchSessionManager: NSObject, WCSessionDelegate {

    static let sharedManager = WatchSessionManager()
    private override init() {
        super.init()
    }

    private var dataSourceChangedDelegates = [DataSourceChangedDelegate]()

    private let session: WCSession = WCSession.defaultSession()

    func startSession() {
        session.delegate = self
        session.activateSession()
    }

    func addDataSourceChangedDelegate<T where T: DataSourceChangedDelegate, T: Equatable>(delegate: T) {
        dataSourceChangedDelegates.append(delegate)
    }

    func removeDataSourceChangedDelegate<T where T: DataSourceChangedDelegate, T: Equatable>(delegate: T) {
        for (index, indexDelegate) in dataSourceChangedDelegates.enumerate() {
            if let indexDelegate = indexDelegate as? T where indexDelegate == delegate {
                dataSourceChangedDelegates.removeAtIndex(index)
                break
            }
        }
    }
}

// MARK: Application Context
// use when your app needs only the latest information
// if the data was not sent, it will be replaced
extension WatchSessionManager {

    // Receiver
    func session(session: WCSession, didReceiveApplicationContext applicationContext: [String : AnyObject]) {

        dispatch_async(dispatch_get_main_queue()) { [weak self] in
            self?.dataSourceChangedDelegates.forEach { $0.dataSourceDidUpdate(DataSource(data: applicationContext))}
        }

    }
}

Answer 1

由于updateApplicationContext只存储最新的应用程序上下文,您可以随时更新它.手表只能获得最新数据.没有具有旧上下文的队列.

在手表端,激活会话和设置WCSessionDelegate的最安全位置在ExtensionDelegate init方法中:

class ExtensionDelegate: NSObject, WKExtensionDelegate {

    override init() {
        super.init()
        WatchSessionManager.sharedManager.startSession()
    }
    ...
}

您的Glance不会更新,因为当显示Glance时,applicationDidFinishLaunching未被调用(因为仅在启动Glance时未启动监视应用程序)