layer.cornerRadius not working in conjunction with NSLayoutConstraints (swift 3)

Question

Below are my profile view constraints and the view renders well, however the width consistently returns zero. So that final constraint, profileImageView.layer.cornerRadius = (profile.frame.width / 2) returns zero everytime.

    profileImageView.translatesAutoresizingMaskIntoConstraints = false


    addConstraint(NSLayoutConstraint(item: profileImageView, attribute: .width, relatedBy: .equal, toItem: containerView, attribute: .width, multiplier: 0.125, constant: 0))


    addConstraint(NSLayoutConstraint(item: profileImageView, attribute: .height, relatedBy: .equal, toItem: containerView, attribute: .width, multiplier: 0.125, constant: 0))




    addConstraint(NSLayoutConstraint(item: profileImageView, attribute: .centerY, relatedBy: .equal, toItem: containerView, attribute: .centerY, multiplier: 1, constant: 0))

    addConstraint(NSLayoutConstraint(item: profileImageView, attribute: .centerX, relatedBy: .equal, toItem: containerView, attribute: .centerX, multiplier: 0.25, constant: 0))

    profileImageView.layer.cornerRadius = (profileImageView.frame.width / 2)

Any suggestions?

Answer 1

profileImageView.frame.width is zero, because of it's frame isn't calculated yet. Inside your profileImageView override layoutSubviews method:

override func layoutSubviews() {
    super.layoutSubviews()
    layer.cornerRadius = bounds.width / 2.0
}

Or if you're using view controller, override viewDidLayoutSubviews method:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    profileImageView.layer.cornerRadius = profileImageView.bounds.width / 2.0
}