Open Cocoa App via URL Scheme

Question

My question is identical to this question but it hasn't been updated in a while and Swift has changed a lot since it was asked so the answer might need to be refreshed. All I want to do is capture the url used to open my cocoa app, but the code never gets executed in my handler function. Errors are thrown in Console.app when I launch my application via the custom url scheme. Here are the errors:

-[MyApp.AppDelegate handleGetURLEvent:replyEvent:]: unrecognized selector sent to instance 0x60c0000039b0
-[MyApp.AppDelegate handleGetURLEvent:replyEvent:]: unrecognized selector sent to instance 0x60c0000039b0
    OSErr AERemoveEventHandler(AEEventClass, AEEventID, AEEventHandlerUPP, Boolean)(spec,phac handler=0x7fff576b7f15 isSys=YES) err=0/noErr
-[MyApp.AppDelegate handleGetURLEvent:replyEvent:]: unrecognized selector sent to instance 0x60c0000039b0
-[MyApp.AppDelegate handleGetURLEvent:replyEvent:]: unrecognized selector sent to instance 0x60c0000039b0
    OSErr AERemoveEventHandler(AEEventClass, AEEventID, AEEventHandlerUPP, Boolean)(GURL,GURL handler=0x7fff5661d680 isSys=YES) err=0/noErr
LSExceptions shared instance invalidated for timeout.

And my bare bones app:

Create a new Cocoa app named MyApp. In Info > URL Types, enter my app's bundle identifier in the Identifier field, and blue (for example) in the URL Schemes field. Add the following two functions to the AppDelegate class:

func applicationWillFinishLaunching(_ notification: Notification) {
    let appleEventManager: NSAppleEventManager = NSAppleEventManager.shared()
    appleEventManager.setEventHandler(self, andSelector: Selector(("handleGetURLEvent:replyEvent:")), forEventClass: AEEventClass(kInternetEventClass), andEventID: AEEventID(kAEGetURL))
}

func handleGetURLEvent(event: NSAppleEventDescriptor?, replyEvent: NSAppleEventDescriptor?) {
    NSLog("heyo!")
}

Build and run my app. Quit it, then in Safari type blue://whatever in the address bar and hit return. The app opens, but the NSLog doesn't show up in Console.app and instead I get the errors I mentioned above. I would love to be stuck on how to parse the url, but I can't even get to that part yet. I'm running Xcode 8.3.3 (8E3004b) and Swift 3.1. Do you all get the same result as me? Am I calling the handler function wrong?

UKDataGeek UKDataGeek · Accepted Answer · 2018-02-22T12:53:34

@Lucas Derraugh is a genius - I looked all over for that solution. Thanks!

One addition on Swift 4 Xcode prompted me to add @objc to the function so I had:

  func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Register for Call back URL events
        let aem = NSAppleEventManager.shared();
        aem.setEventHandler(self, andSelector: #selector(AppDelegate.handleGetURLEvent(event:replyEvent:)), forEventClass: AEEventClass(kInternetEventClass), andEventID: AEEventID(kAEGetURL))

    }

  @objc func handleGetURLEvent(event: NSAppleEventDescriptor, replyEvent: NSAppleEventDescriptor) {

    let urlString = event.paramDescriptor(forKeyword: AEKeyword(keyDirectObject))?.stringValue!
        let url = URL(string: urlString!)!
       // DO what you will you now have a url.. 

    }

Open Cocoa App via URL Scheme

2 Answers