Open Radar

 
Summary:
Sharing services should be able to take parameters for service-specific attributes. For example, the Compose Mail service should be able to take a list of recipients, a subject, etc. The Compose Message service should take a list of recipients, as well.

This could be as easy as exposing a "parameters" property on NSSharingService. The parameters could be secure coded across process boundaries through ShareKit, just as they are through XPC.

Steps to Reproduce:
Use NSSharingService. Be saddened by the fact that the Compose Mail service isn't nearly as useful as it is on iOS.

Expected Results:
The services should be more customizable on a per-service basis. The shared items shouldn't be the only thing that's mutable.

Example:
[service setParameters:@{
    NSSharingServiceComposeMessageRecipientsKey: @[@"jdoe@apple.com", @"logan@panic.com"],
    NSSharingServiceComposeMessageSubjectKey: @"Here's the items for which you asked"
}];