> On Nov 29, 2016, at 11:30 AM, Andreas Falkenhahn <andr...@falkenhahn.com> > 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. > > -- > Best regards, > Andreas Falkenhahn mailto:andr...@falkenhahn.com > -- David Duncan _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
