Programmatic Auto Layout Constraints to Edges of Superview

Question

I have done quite a bit of auto layout in Xcode's storyboard editor, but I rarely ever do anything in code. In one particular instance, I need to create the programmatic equivalent to these constraints:

These constraints are added to textView and the superview is another view called commentBox. I've tried this so far, but the code feels redundant and results in an auto layout error of conflicting constraints:

//Trailing
textView.addConstraint(NSLayoutConstraint(item: textView, attribute: .trailing, relatedBy: .equal, toItem: cell.commentBox, attribute: .trailing, multiplier: 1, constant: 15))
//Leading
textView.addConstraint(NSLayoutConstraint(item: textView, attribute: .leading, relatedBy: .equal, toItem: cell.commentBox, attribute: .leading, multiplier: 1, constant: 15))
//Bottom
textView.addConstraint(NSLayoutConstraint(item: textView, attribute: .bottom, relatedBy: .equal, toItem: cell.commentBox, attribute: .bottom, multiplier: 1, constant: 10))
//Top
textView.addConstraint(NSLayoutConstraint(item: textView, attribute: .top, relatedBy: .equal, toItem: cell.commentBox, attribute: .top, multiplier: 1, constant: 10))

Any idea what am I doing wrong? Thanks!

Answer 1

Try this:

commentBox.addSubview(textView)

textView.translatesAutoresizingMaskIntoConstraints = false

textView.topAnchor.constraint(equalTo: commentBox.topAnchor, constant: 10).isActive = true
textView.bottomAnchor.constraint(equalTo: commentBox.bottomAnchor, constant: -10).isActive = true
textView.leadingAnchor.constraint(equalTo: commentBox.leadingAnchor, constant: 15).isActive = true
textView.trailingAnchor.constraint(equalTo: commentBox.trailingAnchor, constant: -15).isActive = true