On Sat, Mar 16, 2013, at 05:38 PM, Chuck Soper wrote: > I thought I'd create a new thread because I'm not sure I need to take > that > general approach for my specific case. My user interface works fine. The > problem is that my documentView is ambiguous, but I think I can ignore > that fact for my particular case. Here are the details: > > My documentView is a custom NSView subclass. > > From awakeFromNib in my documentView, I call: > [self setTranslatesAutoresizingMaskIntoConstraints:NO];
This is the root of your problem. If you watch my auto layout talk, which I gave before devising the solution I presented in the other thread, I discuss how our then-current approach used this strategy and noted the persistent layout ambiguity it caused. > > > I override updateConstraints in my documentView, and set up the following > constraints (built in a for loop for 1 to N subviews): > @"H:|[subview1][subview2][subview3]|" > > > Each subview has an "NSLayoutConstraint * widthConstraint;" ivar that > holds the absolute width. Visually, it looks like this: > @"H:[subview(==120)]" You have now fixed the width of your documentView at (120 * N) points wide. > > > I also added some minimum width and height constraints that look like > this: > @"H:[subview(>=80)]" and @"V:[subview(>=70)]" The horizontal constraint is unnecessary; the views are already at a fixed width. > > > To pin the height of the documentView to its NSScrollView, I use the > following constraint: > NSDictionary * scrollViewsDict = > NSDictionaryOfVariableBindings(documentView); > > [scrollView addConstraints: [NSLayoutConstraint > constraintsWithVisualFormat: > @"V:|[documentView]|" options: 0 metrics: nil views: > scrollViewsDict]]; You have not shown any other vertical constraints for your subviews. If all you have are the ">= 70" constraints, there are infinitely many solutions to your document view height. That would be the source of your ambiguity. > > Actions and behavior: > > - Resizing the window changes the height of the documentView but not the > width. > - The width of each subview can be changed by adjusting the constraint > constant, like this: subview1.widthConstraint.constant = 220.0; If you're manually updating the constants of these constraints, you either need to clamp the value at a minimum of 80, or you need to make the ">= 80" constraints a higher priority than the "==120" constraints. Otherwise the first time you make the equality constraints' constants less than 80, you will get an unsatisfiable constraints exception, and AppKit will break one of your constraints. --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
