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swiftuikit

Changing constraints by pressing a button

Is there a way to change view’s centerXAnchor constraint to another object (with animation) by pressing a button while the app is running?

Thank's for all of the answers!

Solution

  • First, you need to create an IBOutlet for your constraint from the storyboard, something similar to this.

    @IBOutlet weak var centerXConstraint: NSLayoutConstraint!

    And when the button is pressed, you should change the constraint value and update the view layout.

    centerXConstraint.constant = setYourValueHere
UIView.animate(withDuration: 0.3, animations: { 
   self.view.layoutIfNeeded()
})

    If you want to add constraints programmatically, then remove @IBOutlet weak.

    var centerXConstraint: NSLayoutConstraint!

    Assign your view's center X anchor to it.

    centerXConstraint = yourView.centerXAnchor.constraint(equalTo: super.view.centerXAnchor, constant: 0)
centerXConstraint.isActive = true

    after that, you can change it as described above.