Re: how do you suppose targetViewControllerForAction:sender: works?
Re: how do you suppose targetViewControllerForAction:sender: works?
- Subject: Re: how do you suppose targetViewControllerForAction:sender: works?
- From: glenn andreas <email@hidden>
- Date: Thu, 09 Oct 2014 12:03:15 -0500
(typed in mail)
if ([[vc class] instanceMethodForSelector: selector] != [[vc superclass] instanceMethodForSelector: selector]) {
// vc's class implements an instance method that is different from it's superclass - i.e., it has overridden it
}
On Oct 9, 2014, at 11:56 AM, Matt Neuburg <email@hidden> wrote:
> From the WWDC 2014 video 216: "targetViewControllerForAction works by looking at the View Controller and seeing if it's _overwritten_ the action method that you've passed in."
>
> From Kyle Sluder's blog: "-targetViewControllerForAction:sender: ... will then determine whether the instance’s method for that selector is an override of a UIViewController implementation for the same selector."
>
> Those descriptions are correct. But then how do you suppose it does this? There's an introspective voodoo happening here that I've never seen before. `respondsToSelector:` obviously doesn't cut it: it would return YES if this class merely _inherits_ the ability to respond to this selector. How would you find out the answer to the question, "does this UIViewController subclass respond to this selector _differently_ from UIViewController?"
>
> Thx - m.
>
> --
> matt neuburg, phd = http://www.apeth.net/matt/
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