Re: unwind segue on navigation pop
Re: unwind segue on navigation pop
- Subject: Re: unwind segue on navigation pop
- From: Roland King <email@hidden>
- Date: Sat, 14 May 2016 09:38:23 +0800
> On 13 May 2016, at 23:03, Kyle Sluder <email@hidden> wrote:
>
> On Thu, May 12, 2016, at 09:48 PM, Roland King wrote:
>> I’m making more use of unwind segues to try and get to the point I have
>> ‘go forward’ and ‘go backward’ code in one place in the same class. So
>> during prepareForSegue I set some stuff up, during my unwind segue method
>> I tear it down again. Don’t use it for everything, but for some complex
>> presentations it’s been quite useful.
>>
>> I’ve just changed a piece of navigation to use a standard nav controller,
>> it used to be a modal presentation but a push makes more sense. So now
>> there’s no custom dismiss button like there used to be, you go back with
>> the normal back button on the nav controller. I can’t find a good way to
>> get that back action to trigger my unwind segue. Can’t seem to do it in
>> IB, I don’t want a custom back button because you lose the chevron (or
>> have to fake it) and all the normal uinav behaviour.
>
> The Back button is not customizable in this fashion. Please file an
> enhancement request at https://bugreport.apple.com.
>
> --Kyle Sluder
>
Yes I know it’s not customizable - but I was looking for a shorter term solution than an enhancement request, because I actually need to write the app.
Is there a way to locate the exit segue method in a similar way to how exit segues themselves would find it so I can call it directly. In this case the exit segue is implemented by a VC pushed onto a nav stack below the one exiting.
triggering the exit segue from viewWillDissapear: works but has a very fragile feel to it.
targetForAction:withSender: doesn’t work because the responder chain goes through the nav controller and on upwards, but not through the sibling pushed VCs
targetViewControllerForAction:withSender I hoped would work, but seems to have the same issue, I don’t think the nav controller checks its children VCs
I didn’t really want to rebuild the machinery using allowedChildViewControllersForUnwindingFromSource: etc and hoped there was a pre-existing method to do the resolution.
Looks like I’m using a protocol and revisiting in 2 years.
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