WatchOS2 - New API - WatchConnectivity - Example

WatchOS 2 Experiments - New API Components - WatchConnectivity with Paired Devices.

Example

Requirements

• = XCode 8.0.

• = Swift 3.

• = iOS 9.0.

Tested on WatchOS3, iOS 10.0 Simulators, Apple Watch, iPhone 6, iPhone 7.

Important

this is the Xcode 8 / Swift 3 updated project.

Usage

To run the example project, download or clone the repo.

Example Code!

Configure Watch App:

• Drag and drop WKInterfaceButton, WKInterfaceLabel to Interface Controller (Storyboard)
• connect your WKInterfaceButton to your Interface Controller class
• define your WKInterfaceButton IBAction

Configure iOS App:

• Drag and drop UIButton, UILabel to ViewController (Storyboard)
• connect your UIButton to your ViewController class
• define your UIButton IBAction

Example of code in controllers classes WKInterfaceController (for WatchOS) AND ViewController (for iOS App) :

• Add WatchConnectivity Framework

import WatchConnectivity

• Properties

var session : WCSession!

• in willActivate() for Watch Extension AND viewDidLoad() for iOS App

// To configure and activate the session
if WCSession.isSupported() {
    session = WCSession.defaultSession()
    session.delegate = self
    session.activateSession()
}

• Send message example (iOS App -> Watch)

// Method to send message to watchOS
@IBAction func sendToWatch(sender: AnyObject) {
    // A dictionary of property list values that you want to send.
    let messageToSend = ["Message":"Hi watch, are you here?"]

    // Task : Sends a message immediately to the counterpart and optionally delivers a response
    session.sendMessage(messageToSend, replyHandler: { (replyMessage) -> Void in

        // Reply handler - present the reply message on screen
        let value = replyMessage["Message"] as? String

        // GCD - Present on the screen
        dispatch_async(dispatch_get_main_queue(), { () -> Void in
        self.replyLabel.text = value!
        })

        }) { (error:NSError) -> Void in
            // Catch any error Handler
            print("error: \(error.localizedDescription)")
    }
}

• Send message example (Watch -> iOS App)

// Send message to paired iOS App (Parent)
@IBAction func sendToParent() {
    // A dictionary of property list values that you want to send.
    let messageToSend = ["Message":"Hey iPhone! I'm reachable!!!"]

    // Task : Sends a message immediately to the counterpart and optionally delivers a response
    session.sendMessage(messageToSend, replyHandler: { (replyMessage) -> Void in

        // Reply handler - present the reply message on screen
        let value = replyMessage["Message"] as? String

        // Set message label text with value
        self.messageLabel.setText(value)

        }) { (error:NSError) -> Void in
            // Catch any error Handler
            print("error: \(error.localizedDescription)")
    }
}

• WCSession Protocol example

// WCSession Delegate protocol
func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -> Void) {

    // Reply handler, received message
    let value = message["Message"] as? String

    // GCD - Present on the screen
    dispatch_async(dispatch_get_main_queue()) { () -> Void in
        self.messageLabel.setText(value!)
    }

    // Send a reply
    replyHandler(["Message":"Yes!\niOS 9.0 + WatchOS2 ..AAAAAAmazing!"])

}

Build and Run WatchApp AND iOS App!