I noticed a problem while writing a program using XPC on macOS.
When I write it in the form of a closure that receives the result of an XPC call, I can't receive it forever.
I add an XPC target in Xcode, the sample code is used in the pass closure format, but can't I use closure passing with XPC?
My Environment:
Xcode 15.3
macOS 14.4.1
caller (closure version)
struct ContentView: View {
@State var callbackResult: String = "Waiting…"
var body: some View {
Form {
Section("Run XPC Call with no argument and no return value using callback") {
Button("Run…") {
callbackResult = "Running…"
let service = NSXPCConnection(serviceName: "net.mtgto.example-nsxpc-throws-error.ExampleXpc")
service.remoteObjectInterface = NSXPCInterface(with: ExampleXpcProtocol.self)
service.activate()
guard let proxy = service.remoteObjectProxy as? any ExampleXpcProtocol else { return }
defer {
service.invalidate()
}
proxy.performCallback {
callbackResult = "Done"
}
}
Text(callbackResult)
...
}
}
}
callee (closure version)
@objc protocol ExampleXpcProtocol {
func performCallback(with reply: @escaping () -> Void)
}
class ExampleXpc: NSObject, ExampleXpcProtocol {
@objc func performCallback(with reply: @escaping () -> Void) {
reply()
}
}
I found this problem can be solved by receiving asynchronous using Swift Concurrency.
caller (async version)
struct ContentView: View {
@State var callbackResult: String = "Waiting…"
var body: some View {
Form {
Section("Run XPC Call with no argument and no return value using callback") {
Button("Run…") {
simpleAsyncResult = "Running…"
Task {
let service = NSXPCConnection(serviceName: "net.mtgto.example-nsxpc-throws-error.ExampleXpc")
service.remoteObjectInterface = NSXPCInterface(with: ExampleXpcProtocol.self)
service.activate()
guard let proxy = service.remoteObjectProxy as? any ExampleXpcProtocol else { return }
defer {
service.invalidate()
}
await proxy.performNothingAsync()
simpleAsyncResult = "DONE"
}
Text(simpleAsyncResult)
...
}
}
}
callee (async version)
@objc protocol ExampleXpcProtocol {
func performNothingAsync() async
}
class ExampleXpc: NSObject, ExampleXpcProtocol {
@objc func performNothingAsync() async {}
}
To simplify matters, I write source code that omits the arguments and return value, but it is not also invoked by using callback style.
All sample codes are available in
https://github.com/mtgto/example-nsxpc-throws-error
mtgto
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