Hi All,

I’m trying to add Constraints to a View in order to have it stretch to the left 
and right edges of the superview. This is slight complicated by it being in a 
ScrollView/Stack View Combo as so:


NSScrollView                                            Setup in NIB
        NSFlippedClipView                               Setup in NIB
                NSStackView                             Setup in NIB
                        LTWDetailXView          (added dynamically in code).


The Detail View is smaller in Width than the  NSScrollView/NSStackView and I 
want it to stretch to fit it.

I tried adding the following constraints in code as follows:

myDetailView = [myDetailViewController getPrimaryView];
[self.pValidationListStackView addView:myDetailView 
inGravity:NSStackViewGravityTop];

myConstraintsViewDictionary = [[NSMutableDictionary alloc] init];
[myConstraintsViewDictionary setObject:self.pValidationListStackView 
forKey:@"StackView"];
[myConstraintsViewDictionary setObject:myDetailView forKey:@"DetailView"];
                
myConstraintsArray = [NSLayoutConstraint 
constraintsWithVisualFormat:@"H:[StackView]-(<=1)-[DetailView]" 
options:NSLayoutFormatAlignAllLeft metrics:nil 
views:myConstraintsViewDictionary];
[myDetailView addConstraints:myConstraintsArray];
                
myConstraintsArray = [NSLayoutConstraint 
constraintsWithVisualFormat:@"H:[StackView]-(<=1)-[DetailView]" 
options:NSLayoutFormatAlignAllRight metrics:nil 
views:myConstraintsViewDictionary];
[myDetailView addConstraints:myConstraintsArray];

But I get this Error Message:

Unable to parse constraint format: 
Options mask required views to be aligned on a horizontal edge, which is not 
allowed for layout that is also horizontal. 
H:[StackView]-(<=1)-[DetailView] 
                                ^
I’m not sure what this means or if the above code is correct?

If anyone has any ideas on this I’d really love to hear them!

Thanks a lot for any help.
All the Best
Dave



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