Gary, Thanks for the reply. I tried moving the container rather than resizing to 0 because there's a table inside this view and it will relayout when resizing. For an animation, I guess it depends on what effect you want: either seeing the view move or resize to 0.
Oddly, when I put my code to activate/deactivate constraints inside a [UIView animateWithDuration…] I get no animation. :( Doug Hill > On Dec 14, 2016, at 2:49 PM, Gary L. Wade <garyw...@desisoftsystems.com> > wrote: > > If I understand you correctly, you might prefer the approach I chose to do. > Rather than activating and deactivating constraints (BTW, you should always > deactivate before having multiple actives), set your constraints up to always > be active but change the width for the one you’re hiding to 0 and the other > to be the extra size needed to fill the gap. I also chose to animate the > constant values, so the size-change is smooth to the user. > -- > Gary L. Wade > http://www.garywade.com/ <http://www.garywade.com/> >> On Dec 14, 2016, at 2:19 PM, Doug Hill <cocoa...@breaqz.com >> <mailto:cocoa...@breaqz.com>> wrote: >> >> I'm seeing warnings in the console when I dynamically make autolayout >> constraints active/inactive at runtime. >> >> I have two constraints that align a container view leading or trailing edge >> with another view's edge. This is to move the container onscreen or >> offscreen. I have another view whose trailing edge aligns with the leading >> edge of the first container view so it moves with it as autolayout >> constraints change. >> >> At runtime, I make one of these constraints active and the other inactive, >> like so: >> >> - (IBAction)toggleCommentsVisibility:(id)sender >> { >> self.commentsAreHidden ? [self showComments:self] : [self >> hideComments:self]; >> } >> >> - (IBAction)showComments:(id)sender >> { >> self.showCommentsConstraint.active = YES; >> self.hideCommentsContainerConstraint.active = NO; >> >> self.commentsAreHidden = NO; >> } >> >> - (IBAction)hideComments:(id)sender >> { >> self.showCommentsConstraint.active = NO; >> self.hideCommentsContainerConstraint.active = YES; >> >> self.commentsAreHidden = YES; >> } >> >> When I call showComments, I get the following warning in the console: >> >> ===== >> >> Unable to simultaneously satisfy constraints. >> Probably at least one of the constraints in the following list is one you >> don't want. >> Try this: >> (1) look at each constraint and try to figure out which you don't >> expect; >> (2) find the code that added the unwanted constraint or constraints and >> fix it. >> ( >> "<NSLayoutConstraint:0x7f91426a3ef0 'CommentContainerProportionalWidth' >> UIView:0x7f91426d9db0.width == 0.33*UIView:0x7f91426def30.width>", >> "<NSLayoutConstraint:0x7f91426c91e0 'Hide Comments Constraint' >> H:[UIView:0x7f91426d7f00]-(0)-[UIView:0x7f91426d9db0]>", >> "<NSLayoutConstraint:0x7f91426e2990 'ShowComments' >> UIView:0x7f91426d9db0.trailing == UIView:0x7f91426d7f00.trailing>", >> "<NSLayoutConstraint:0x7f91427e43c0 'UIView-Encapsulated-Layout-Width' >> H:[UIView:0x7f91426def30(768)]>" >> ) >> >> Will attempt to recover by breaking constraint >> <NSLayoutConstraint:0x7f91426c91e0 'Hide Comments Constraint' >> H:[UIView:0x7f91426d7f00]-(0)-[UIView:0x7f91426d9db0]> >> >> Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to >> catch this in the debugger. >> >> ===== >> >> This is puzzling because IB doesn't give me any autolayout errors/warning >> when I manually activate/deactivate these constraints. Also, I don't get >> this runtime warning when calling hideComments, only the 'show' case. >> Finally, things actually work at runtime because it's nice enough to "break" >> the constraint that I deactivated in code. But I would like to not have >> these warnings. >> >> Any ideas on what's going on how I might go about debugging this? >> >> Doug Hill >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com >> <mailto: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 >> <http://lists.apple.com/> >> >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/cocoa-dev/garywade%40desisoftsystems.com >> >> <https://lists.apple.com/mailman/options/cocoa-dev/garywade%40desisoftsystems.com> >> >> This email sent to garyw...@desisoftsystems.com > _______________________________________________ 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
