Adding constraints programmatically in UIView with UITextView

Question

I added constraints programmatically in my UITextView, but trailing and bottom constraints are not working correctly. others work fine. I think UITextView frame size is not correct.

I just want to add margin in my UITextView programmatically.

My code is

    let textView = UITextView()
    self.view.addSubview(textView)

    var constraints = [NSLayoutConstraint]()

    constraintTop = NSLayoutConstraint(item: textView,
        attribute: NSLayoutAttribute.Top,
        relatedBy: NSLayoutRelation.Equal,
        toItem: self.view,
        attribute: NSLayoutAttribute.Top,
        multiplier: 1.0,
        constant: 10)
    constraints.append(constraintTop)

    constraintBottom = NSLayoutConstraint(item: textView,
        attribute: NSLayoutAttribute.Bottom,
        relatedBy: NSLayoutRelation.Equal,
        toItem: self.view,
        attribute: NSLayoutAttribute.Bottom,
        multiplier: 1.0,
        constant: 10)
    constraints.append(constraintBottom)

    constraintLeft = NSLayoutConstraint(item: textView,
        attribute: NSLayoutAttribute.Leading,
        relatedBy: NSLayoutRelation.Equal,
        toItem: self.view,
        attribute: NSLayoutAttribute.Leading,
        multiplier: 1.0,
        constant: 10)
    constraints.append(constraintLeft)

    constraintRight = NSLayoutConstraint(item: textView,
        attribute: NSLayoutAttribute.Trailing,
        relatedBy: NSLayoutRelation.Equal,
        toItem: self.view,
        attribute: NSLayoutAttribute.Trailing,
        multiplier: 1.0,
        constant: 10)
    constraints.append(constraintRight)

    self.view.addConstraints(constraints)

Answer 1

You can fix this in one of two ways:

1. Change the constant to -10 for your bottom and trailing constraints.

or

2. Switch the order of the item: and toItem: values in the bottom and trailing constraints. That is, make item: self.view and toItem: textView for the bottom and trailing constraints. This is how it is done if you set the constraints in the StoryBoard.