Comments (5)
Define how you would like to update said constraint? Are you looking to just update the "constant" or also re-assign the LHS/RHS?
If you strictly say want to update that 107 to maybe 40 or something you would just need to:
snp_updateConstraints { make in
make.top.equalTo(40)
}
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Thanks for responding.
I would like to update the self.leftConstraint
constant such that left is now = self.view.snp_left, instead of right.
The real goal is to animate draftsSiteManagement
from where is off screen to 0 (on screen).
Basically like I would do with a standard NSLayoutConstraint constraint.constant = 5
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After reading your other response to my other question I think I'm not approaching this properly.
I probably need to uninstall the constraint and apply a new one and layoutIfNeeded() in an animation block.
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@nickvelloff it's important to note there are a couple parts to a constraint. Remember the constant
is strictly the offset value of the constraint. Constraints are formulated as such:
(LHS) (RELATION) (RHS)? * (MULTIPLIER) + (CONSTANT)
The RHS can be nil, in cases where you do an equalTo(<non-view-value>)
you are actually essentially doing: equalTo(nil).offset(<non-view-value>)
.
So yes in your particular case you are altering the LHS/RHS of the constraint and thus need a new one.
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I was confusing the meaning of self.view.snp_right
with it evaluating that value and using it as a <non-view-value>
constant. Newbie mistake, thanks for the clarification.
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