來到watchOS2的時代，除了Watch可以獨立運行外，與Phone溝通也變得比較容易，透過全新的WatchConnectivity framework，就能彼此溝通呢！於是就不用像watchOS1時代拐彎抹角囉～
首先在IB上Phone（Main.storyboard）和Watch（Interface.storyboard）各拉label和button，並且準備設定IBOutlet和IBAction。
Phone的介面
Watch的介面
Phone和Watch將程式碼分別寫在ViewController.swift和InterfaceController.swift。兩者程式碼非常相似，皆透過WCSession單實體設定代理來傳送與接收。
/**
Theme: Communication between Phone and Watch
IDE: Xcode 7
Language: Swift
Date: 104/09/25
Author: HappyMan
Blog: https://cg2010studio.wordpress.com/
*/
//- - - Phone ViewController
import UIKit
import WatchConnectivity
class ViewController: UIViewController, WCSessionDelegate {
var session: WCSession!
@IBOutlet var label: UILabel!
@IBOutlet var button: UIButton!
func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -> Void) {
//handle received message
let value = message["Value"] as? String
dispatch_async(dispatch_get_main_queue()) {
self.label.text = value
}
//send a reply
replyHandler(["Value":"Hello, Happy Watch"])
}
@IBAction func sendMessage(sender: AnyObject) {
//Send Message to WatchKit
let messageToSend = ["Value":"Hi, happy watch, can you talk to me?"]
session.sendMessage(messageToSend, replyHandler: { replyMessage in
//handle the reply
let value = replyMessage["Value"] as? String
//use dispatch_asynch to present immediately on screen
dispatch_async(dispatch_get_main_queue()) {
self.label.text = value
}
}, errorHandler: {error in
// catch any errors here
print(error)
})
}
override func viewDidLoad() {
super.viewDidLoad()
if (WCSession.isSupported()) {
session = WCSession.defaultSession()
session.delegate = self;
session.activateSession()
}
}
}
//- - - Watch ViewController
import WatchKit
import Foundation
import WatchConnectivity
class InterfaceController: WKInterfaceController, WCSessionDelegate {
var session : WCSession!
@IBOutlet var label: WKInterfaceLabel!
@IBOutlet var button: WKInterfaceButton!
func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -> Void) {
//handle received message
let value = message["Value"] as? String
//use this to present immediately on the screen
dispatch_async(dispatch_get_main_queue()) {
self.label.setText(value)
}
//send a reply
replyHandler(["Value":"Yes, sure"])
}
@IBAction func sendMessage() {
let messageToSend = ["Value":"Hello happy iPhone"]
session.sendMessage(messageToSend, replyHandler: { replyMessage in
//handle and present the message on screen
let value = replyMessage["Value"] as? String
self.label.setText(value)
}, errorHandler: {error in
// catch any errors here
print(error)
})
}
override func willActivate() {
// This method is called when watch view controller is about to be visible to user
super.willActivate()
if (WCSession.isSupported()) {
session = WCSession.defaultSession()
session.delegate = self
session.activateSession()
}
}
}
編譯執行可分別點擊Phone和Watch上的按鈕喔～
點Phone上的按鈕。Watch收到訊息後，回傳資料給Phone。
點Watch上的按鈕。Phone收到訊息後，回傳資料給Watch。
可以看到彼此接收到，將字串呈現在螢幕上。之後可嘗試互傳影像或檔案。
註：Xcode 7.1 beta還不太穩定，使用模擬器執行一段時間就整個卡住不動，我只好重開Xcode來重新運行模擬器，如果可以的話，就用實機來測試吧！
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