OS X Sharing Extension?

[Karl Moskowski]

I have an OS X app for creating time-lapse movies from a series of still 
photos. I want to add a Sharing Extension that implements an "Open with..." 
item in the Sharing menu that has no UI, and just passes the URLs to be opened 
by a the extension’s container app.

I've noticed there's an "Add to Photos" item that does something similar. 
However, the .appex lives in a private FW. I dug into 
/System/Library/PrivateFrameworks/ShareKit.framework/PlugIns/SystemAddToPhotos.appex/Contents/Info.plist;
 its NSExtensionPrincipalClass is set to NSSharingNoUIExtensionProvider, and 
ViewBased isset to NO, which are both undocumented. That means it's no-go for a 
MAS app.

Instead, I just cancel the extension at the end of loadView() in 
ShareViewController.swift, and that kind of works. If I right-click on image 
files in the Finder, and select my test extension from the Share menu, my it 
gets launched. However, doing the same thing in Photos.app, the 
loadItemForTypeIdentifier(...) never fires, and Console shows that the 
extension was killed.

The R&D app and extension are signed with my Developer ID cert.

The source of ShareViewController.swift from my R&D project is below.

Any ideas why it times out with Photos.app. Is there a better way to do this? 
TIA.

----
Karl Moskowski <kmoskow...@me.com>
<http://about.me/kolpanic>


// ShareViewController.swift

import Cocoa

class ShareViewController: NSViewController {
    var URLs : [NSURL] = []
    
    override var nibName: String? {
        return "ShareViewController"
    }
    
    override func loadView() {
        super.loadView()
        let item = self.extensionContext!.inputItems[0] as! NSExtensionItem
        if let attachments = item.attachments {
            var i : Int = 0
            let n = attachments.count
            // need at least 2 photos (could probably handle this better with a 
predicate-based NSExtensionActivationRule)
            if n >= 2 {
                for attachment in attachments {
                    let itemProvider = attachment as! NSItemProvider
                    if 
itemProvider.hasItemConformingToTypeIdentifier(kUTTypeURL as! String) {
                        NSLog("xyzzy - it's a URL")
                        itemProvider.loadItemForTypeIdentifier(kUTTypeURL as! 
String, options: nil, completionHandler: { (decoder : NSSecureCoding!, error : 
NSError!) -> Void in
                            // Photos.app never gets here; Finder does
                            NSLog("xyzzy - URL is loaded")
                            if let url = decoder as? NSURL {
                                i++
                                self.URLs.append(url)
                                
                                if i == n {
                                    // launch the app with all the URLs once 
they're all loaded
                                    NSLog("xyzzy - launching")
                                    
NSWorkspace.sharedWorkspace().openURLs(self.URLs, withAppBundleIdentifier: 
"me.karlmoskowski.Foobar", options: nil, additionalEventParamDescriptor: nil, 
launchIdentifiers: nil)
                                }
                            }
                        })
                    }
                }
            }
        }
        
        // dismiss the UI, to fake a UI-less extension, since 
NSSharingNoUIExtensionProvider is undocumented
        cancel(nil)
    }
    
    @IBAction func send(sender: AnyObject?) {
        cancel(sender)
    }
    
    @IBAction func cancel(sender: AnyObject?) {
        let cancelError = NSError(domain: NSCocoaErrorDomain, code: 
NSUserCancelledError, userInfo: nil)
        self.extensionContext!.cancelRequestWithError(cancelError)
    }
    
}


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