I have a basic setup following WWDC 2020 on Safari Web Extensions and another one on XPC. The video even mentions that one can use UserDefaults or XPC to communicate with the host app. Here is my setup.
macOS 15.2, Xcode 16.2 A macOS app (all targets sandboxed, with an app group) with 3 targets:
- SwiftUI Hello World
- web extension
- XPC Service
The web extension itself works and can update UserDefaults, which can then be read by SwiftUI app - everything works by the book.
The app can communicate to the XPC service via NSXPCConnection - again, everything works fine.
The problem is that the web extension does not communicate with XPC, and this is what I need so that I can avoid using UserDefaults for larger and more complex payloads.
Web Ext handler code:
class SafariWebExtensionHandler: NSObject, NSExtensionRequestHandling {
func beginRequest(with context: NSExtensionContext) {
// Unpack the message from Safari Web Extension.
let item = context.inputItems[0] as? NSExtensionItem
let message = item?.userInfo?[SFExtensionMessageKey]
// Update the value in UserDefaults.
let defaults = UserDefaults(suiteName: "com.***.AppName.group")
let messageDictionary = message as? [String: String]
if messageDictionary?["message"] == "Word highlighted" {
var currentValue = defaults?.integer(forKey: "WordHighlightedCount") ?? 0
currentValue += 1
defaults?.set(currentValue, forKey: "WordHighlightedCount")
}
let response = NSExtensionItem()
response.userInfo = [ SFExtensionMessageKey: [ "Response to": message ] ]
os_log(.default, "setting up XPC connection")
let xpcConnection = NSXPCConnection(serviceName: "com.***.AppName.AppName-XPC-Service")
xpcConnection.remoteObjectInterface = NSXPCInterface(with: AppName_XPC_ServiceProtocol.self)
xpcConnection.resume()
let service = xpcConnection.remoteObjectProxyWithErrorHandler { error in
os_log(.default, "Received error: %{public}@", error as CVarArg)
} as? AppName_XPC_ServiceProtocol
service?.performCalculation(firstNumber: 23, secondNumber: 19) { result in
NSLog("Result of calculation XPC is: \(result)")
os_log(.default, "Result of calculation XPC is: \(result)")
context.completeRequest(returningItems: [response], completionHandler: nil)
}
}
}
The error I'm getting:
Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.***.AppName.AppName-XPC-Service was invalidated: failed at lookup with error 3 - No such process."
What am I missing?
