I have created a program to test sending data back and forth from iPhone and AppleWatch, and visa versa. I've set it up so there is a button on the AppleWatch and a button on the iPhone. When the iPhone one is pressed, it will send data and rename the button on the AppleWatch to whatever that data String was.
I then implemented the same code for AppleWatch to iPhone but for some reason iPhone doesn't seem to receive the data. Here's the code for iPhone:
// ViewController.swift
import UIKit
import Foundation
import WatchConnectivity
class WatchManager: UIViewController, WCSessionDelegate {
var watchSession: WCSession? {
didSet {
if let session = watchSession {
session.delegate = self
session.activate()
}
}
}
override func viewDidLoad(){
super.viewDidLoad()
watchSession = WCSession.default
}
private func sendDict(_ dict: [String: Any]) {
do {
try self.watchSession?.updateApplicationContext(dict)
} catch {
print("Error sending dictionary \(dict) to Apple Watch!")
}
}
@IBOutlet weak var transferButton: UIButton!
@IBAction func dataTransfer(_ sender: Any) {
sendDict(["DataKey": UUID().uuidString])
print("sent")
}
func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
print("Session activation did complete")
}
public func sessionDidBecomeInactive(_ session: WCSession) {
print("session did become inactive")
}
public func sessionDidDeactivate(_ session: WCSession) {
print("session did deactivate")
}
func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String : Any]) {
print("phone received app context: ", applicationContext)
if let temperature = applicationContext["DataKey"] as? String {
self.transferButton.setTitle(temperature, for: .normal)
}
}
}
and AppleWatch:
// InterfaceController.swift
import WatchKit
import Foundation
import WatchConnectivity
class InterfaceController: WKInterfaceController {
var watchSession: WCSession? {
didSet {
if let session = watchSession {
session.delegate = self
session.activate()
}
}
}
@IBOutlet weak var temperatureLabel: WKInterfaceButton!
private func sendDict(_ dict: [String: Any]) {
do {
try self.watchSession?.updateApplicationContext(dict)
} catch {
print("Error sending dictionary \(dict) to iPhone!")
}
}
@IBAction func button() {
let urg = ["DataKey":UUID().uuidString]
sendDict(urg)
print("watch sent app context \(urg)")
}
}
extension InterfaceController: WCSessionDelegate {
#if os(iOS)
public func sessionDidBecomeInactive(_ session: WCSession) { }
public func sessionDidDeactivate(_ session: WCSession) {
session.activate()
}
#endif
func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
print("Session activation did complete")
}
func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String : Any]) {
print("watch received app context: ", applicationContext)
if let temperature = applicationContext["DataKey"] as? String {
self.temperatureLabel.setTitle(temperature)
}
}
override func willActivate() {
// This method is called when watch view controller is about to be visible to user
super.willActivate()
watchSession = WCSession.default
}
override func didDeactivate() {
// This method is called when watch view controller is no longer visible
super.didDeactivate()
}
}
I've tried changing the name of the key (didn't work), I made it so the data value is always changing (UUID().uuidString) and kept that. Other things I tried consisted of creating a label and trying to rename that instead of the button which failed, and lastly instead of renaming the button just sending some confirmation that it received data back to the apple watch, which failed.
Any help would be much appreciated, I hope it's not a silly error.
