URL scheme not registed while debugging - swift

Question

For a Mac OSX application I am developing, I want to use an URL scheme, so I set up the scheme like this:
NSAppleEventManager.shared().setEventHandler(
self,
andSelector: #selector(handleUrlEvent(_:with:)),
forEventClass: AEEventClass(kInternetEventClass),
andEventID: AEEventID(kAEGetURL))
And I have a handler registered like this:
#objc
func handleUrlEvent(_ event: NSAppleEventDescriptor, with replyEvent: NSAppleEventDescriptor) {
log.verbose("handleUrlEvent")
}
My URL scheme is registered in my Info.plist
<key>CFBundleURLTypes</key>
<array>
<dict>
<key>CFBundleTypeRole</key>
<string>Viewer</string>
<key>CFBundleURLName</key>
<string>Look for photo</string>
<key>CFBundleURLSchemes</key>
<array>
<string>gisync</string>
</array>
</dict>
</array>
The problem is, when I run my application using Xcode, the URL scheme is not registered and the application does not get the events I need.
When I archive and start my application from there, the scheme IS registered and the application gets the notifications. So then it works correctly, but I lose debugging capabilities.
EDIT: The release build does work somehow, so this seems to be different for release and debug.

Answer 1

Try explicitly registering the app with the Launch Services:
LSRegisterURL
This function adds the designated application and its document and URL claims (if any) to the Launch Services database, making the application a candidate for document and URL binding.
I’d do it in the applicationDidFinishLaunching and use conditional compilation to only do this in the DEBUG version.
Also version number of an app bundle has effect:
Preferred Application for a URL
If two or more versions of the same application have been found, give preference to the one with the latest version number.