Re: How to detect rotation in progress in viewDidLayoutSubview
Re: How to detect rotation in progress in viewDidLayoutSubview
- Subject: Re: How to detect rotation in progress in viewDidLayoutSubview
- From: Andreas Falkenhahn <email@hidden>
- Date: Tue, 29 Nov 2016 20:50:24 +0100
On 29.11.2016 at 17:35 David Duncan wrote:
>> On Nov 29, 2016, at 11:30 AM, Andreas Falkenhahn <email@hidden> wrote:
>> On 28.11.2016 at 16:50 David Duncan wrote:
>>> I think you can do everything you need to do in layoutSubviews
>>> (fundamentally it doesn’t matter if the device rotates or not, you
>>> just want to keep the view centered in its superview).
>> Right, makes sense.
>>> In general you should do as much as possible in layoutSubviews type
>>> methods. However sometimes you really do want to do something
>>> temporary specifically due to a transition between sizes,
>>> orientations, or size classes, and hence why we provide the
>>> “willTransitionTo” methods. If it isn’t a temporary change, then you
>>> don’t want the transition methods, as they are not always called at
>>> points when layoutSubviews will be.
>> Ok, I've now ditched "willTransitionTo" completely and everything is
>> done in my UIView's layoutSubviews method now. Seems to work fine.
>> Just one last thing: the documentation of layoutSubviews mentions
>> that this method, as its name implies, is meant to make adjustments
>> to subviews. But my UIView doesn't have any subviews at all. So
>> currently I'm basically (ab?)using layoutSubviews to make adjustments
>> to the UIView itself, not to its subviews, since there are none.
>> Is that allowed?
> It is generally bad form to modify a view’s own geometry inside of
> layoutSubviews (frame, bounds, center, transform, and a few related
> layer properties), and more generally not outside of initialization
> time. Also keep in mind that when I mentioned layoutSubviews above,
> I also mean the UIViewController methods viewWillLayoutSubviews and
> viewDidLayoutSubviews – and in that case the ‘self’ that you shouldn’t modify is self.view.
> That said, I imagined your view hierarchy was Window =>
> ViewController.View => ContentView, at which point ViewController
> modifying ContentView inside of viewWillLayoutSubviews (for example) is fully kosher.
It is actually just Window => ViewController.View. I really only have
a single UIView initialized by my UIViewController in loadView() and
that's it.
So it's forbidden to move this view in the UIViewController's viewDidLayoutSubviews()
because it is the root view and not a subview? But how should I do it then?
--
Best regards,
Andreas Falkenhahn mailto:email@hidden
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