Handling input from services like "Insert From iPhone"

ViewController.swift

// MARK: - Insert from Services

extension ViewController: NSServicesMenuRequestor {

    // For the sake of this example, this responder doesn't know how to send data to services (e.g. services that accept images or text), but it does know how to accept images. We check if the returned pasteboard type is something NSImage can handle.
    override func validRequestor(forSendType sendType: NSPasteboard.PasteboardType?,
                                 returnType: NSPasteboard.PasteboardType?) -> Any? {
        
        if let typeToInsert = returnType, NSImage.imageTypes.contains(typeToInsert.rawValue), sendType == nil {
            return self
        }
        return super.validRequestor(forSendType: sendType, returnType: returnType)
    }

    // If we are handed an image by a service, stuff it in our NSCollectionView.
    func readSelection(from pboard: NSPasteboard) -> Bool {
        if let image = NSImage(pasteboard: pboard) {
            appendImageToCollection(image)
            return true
        }
        return false
    }

}