On Tue, Feb 26, 2013, at 02:32 PM, Chuck Soper wrote: > Does NSScrollView own its documentView, and controls the value that > documentView returns for setTranslatesAutoresizingMaskIntoConstraints:?
It's actually NSClipView that controls this, but yes. > > I've created an NSView subclass that I'm using for a documentView within > an NSScrollView. I'm calling [self > setTranslatesAutoresizingMaskIntoConstraints:NO] during initialization. > Is > that a problem? The UI works fine, but the layout for my documentView is > ambiguous. I believe that I'm setting its constraints properly. The general philosophy behind -translatesAutoresizingMaskIntoConstraints is that it's the container's job to control that property. That allows containers which position their subviews to incrementally adopt auto layout. > Would it be better to [scrollView.documentView > addSubview:myContainerView]? Then, add the following constraints to the > scrollView.documentView: > @"V:|[myContainerView]|" and @"H:|[myContainerView]|" > This way, I think that it would be fine to call [self > setTranslatesAutoresizingMaskIntoConstraints:NO] during initialization > for > myContainerView. > If this is true, then I think that I may need to call setFrameSize: on > scrollView.documentView when my myContainerView frame size changes, is > that correct? Or, is there some way to get my documentView to resize > based > on its subviews (i.e. myContainerView)? Sadly, this won't work. The problem here is that the constraints installed by -translatesAutoresizingMaskIntoConstraints are fixed constraints, and if myContainerView's constraints solve to a different value that the frame of the scroll view's document view, you will get an unsatisfiable constraints exception. In order to get auto layout to work with scroll views, we actually override -updateConstraints in our document view, and call [self setTranslatesAutoresizingMaskIntoConstraints:NO] before calling super. Then we set up constraints that keep us correctly sized and positioned relative to our enclosing clip view. This is a terrible hack that I really hope is fixed in a future version of OS X with a constraint-aware implementation of NSScrollView that works like UIScrollView on iOS 6. > > With NSSplitView, I think it's fine to add subviews that use auto layout. Yes, on 10.8. 10.7 is trickier. --Kyle Sluder _______________________________________________ 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
