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)
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
