(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 protected]> 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/
> pantes anthropoi tou eidenai oregontai phusei
> Programming iOS 7! http://shop.oreilly.com/product/0636920031017.do
> iOS 7 Fundamentals! http://shop.oreilly.com/product/0636920032465.do
> RubyFrontier! http://www.apeth.com/RubyFrontierDocs/default.html
>
>
>
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