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How to get layout constraint programmatically

I'm trying to access a constraint in code.
I added a Name property "ButtonBottomConstraint" to the constraint so that I could access it in the ViewController class
But at runtime ButtonBottomConstraint is always null

    public override void ViewDidLoad()
        var contraintConstantValue = ButtonBottomConstraint.Constant

Am I trying to access it at the wrong time?
I've tried ViewDidAppear()and ViewWillAppear()but still it's null

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