Change view width constraint

Question

I set up width of UIView like this:

contentView.widthAnchor.constraint(equalToConstant: CGFloat(scrollWidth())).isActive = true

Now I want to change that width. The question is: how to remove old constraint and add new? I did create NSLayoutConstraint like this

scrollWidthConstraint = NSLayoutConstraint(
    item: contentView,
    attribute: .width,
    relatedBy: .equal,
    toItem: nil,
    attribute: .notAnAttribute,
    multiplier: 1.0,
    constant: CGFloat(scrollWidth())
)

How to set that constraint for UIView for changing later?

for your case you don't have to remove old constraint and add another — Shehata Gamal
– Shehata Gamal, Commented Mar 20, 2019 at 13:38

Shehata Gamal · Accepted Answer · 2019-03-20 13:36:10Z

3

First use this better and short and assign a reference to it

var widCon:NSLayoutConstraint! 

widCon = contentView.widthAnchor.constraint(equalToConstant: CGFloat(scrollWidth()))
widCon.isActive = true

instead of NSLayoutConstraint(item: contentView, then Change it's constant

widCon.constant = ////

edited Mar 20, 2019 at 13:36

answered Mar 20, 2019 at 13:30

Shehata Gamal

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