> On Dec 30, 2015, at 18:14 , Roland King <r...@rols.org> wrote:
>
>
>> On 31 Dec 2015, at 09:12, Rick Mann <rm...@latencyzero.com> wrote:
>>
>> I have a UICollectionView in a UINavigationController, and I'd like to
>> customize the transition from one to the next on push. So I set up the first
>> VC as UIViewControllerTransitioningDelegate, and in
>> prepareForSegue(_:sender:) set the destination VC's transitioningDelegate to
>> self.
>>
>> But my delegate methods never get called. The docs say to set
>> modalPresentationStyle to .Custom, but that has no effect (also, it's a bit
>> weird since this is not technically a modal presentation, is it?).
>>
>> Search for solutions online turns up only custom segues, which is not really
>> what I want.
>>
>> Is it even possible to do this with segues? What am I missing?
>>
>> TIA,
>
> My thought here is that push != present, ie pushViewController(_:animated)
> doesn’t do the same thing as presentViewController(_:animated:completion) and
> that push calls the former and other modes call the latter. I dunno what I’d
> try, the whole UIViewController custom transitioning thing confuses the
> bananas out of me and I never found the WWDC videos on them to be as helpful
> as I wished. Perhaps change the push to a present to get it on the screen,
> then when you’re done with the transition, call pushViewController( vc,
> animated : false ) to fix up the nav stack. That will probably look really
> ugly as the nav bar will likely just snap to the new content.
>
> There’s probably 18 other ways to do it. I’d bung some hooks into any methods
> I could find which run early in the viewcontroller presentation lifecycle and
> see if there’s a transition coordinator or animation coordinator or whatever
> objects transitions create which I could hook into and animate alongside.
>
> In general .. having fiddled with custom transitions when the were new and
> shiny .. I don’t bother with them any more.
It seems to be a common ocurrence that Apple introduces a "helpful" new way to
do things that aren't fully integrated with existing "new" (and definitely not
deprecated. e.g. segues) ways of doing things, and the documentation and
examples are lacking. Bruce Nilo's 2013 presentation on the subject was
particularly lacking in information.
Having said that, I found this sample code (which did not turn up when
searching the sample code for "transition"), which hopefully works. My biggest
beef at this point is that the segue *must* be a modal presentation segue (in
fact, it seems all custom transitions are for modal presentation only), which
seems like a silly limitation, and is not well-documented.
https://developer.apple.com/library/ios/samplecode/SegueCatalog/Introduction/Intro.html
You're looking for the "Modal" button in that app, which has a custom segue
that uses the transition stuff.
--
Rick Mann
rm...@latencyzero.com
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