Call-out Interface Completion Handlers

ID	Created	Type	mocl Version	Dev OS	Target	Status
#90	by TSchulte on 2015-12-11 (1666 days ago)	question	14.08	Mac OS X	iOS	closed

Description

Summary:

The manual specifies a list of data types that can be passed via the call-in / call-out interfaces.  Functions appear to fall into the "anything else" category that will produce a runtime error.  Is there any solution for passing a named or anonymous code block defined in Lisp to an objective-c function?  

For example, it is possible to display a UIAlert from within Lisp, but is there also a way to pass a meaningful non-nil value to the :completion parameter?

(let ((ui-alert @('UIAlertController :alertControllerWithTitle "Hi" :message "Hello" :preferredStyle 1)))
  @('UIApplication sharedApplication keyWindow rootViewController :presentViewController ui-alert :animated t :completion nil))

In the objective-c version of the same code, we can pass an anonymous code block for the completion, but passing either #'some-function-name or #'(lambda() ...) from Lisp will fail, as expected.  Is this simply not possible with today's call-out interface?    

It would of course be possible to define objective-c functions that could interact with the Lisp code to achieve the desired result, I'm just testing to see how far I can push the Lisp side of things.             



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Comments

It isn't possible with the current call-out interface. As you say, best possible workaround might be to write an Obj-C method that passes the completion argument you want, and then call that with the call-out interface.

That said, it might be possible to add this capability if it's really important to you.

- Wukix, 1665 days ago

Thanks for the response.  It would be a nice-to-have, but it's not critical.  Again, just testing the boundaries.

- TSchulte, 1663 days ago