Custom NSSharingService & NSSharingServicePickerDelegate

nssharingservice.swift

extension ViewController: NSSharingServicePickerDelegate {
    func sharingServicePicker(_ sharingServicePicker: NSSharingServicePicker, sharingServicesForItems items: [Any], proposedSharingServices proposedServices: [NSSharingService]) -> [NSSharingService] {
        guard let image = NSImage(named: NSImage.Name("copy")) else {
            return proposedServices
        }
        
        var share = proposedServices
        let customService = NSSharingService(title: "Copy Text", image: image, alternateImage: image, handler: {
            if let text = items.first as? String {
                self.setClipboard(text: text)
            }
        })
        share.insert(customService, at: 0)
        
        return share
    }
}