How do you add inset to UILabel (iOS Swift)?

Question

I am an Android developer learning iOS. How do you add padding (inset) to UILabel in iOS Swift? I have not been successful at finding an easy tutorial on this. Thank you.

Also, how can I add margins to UI elements in Swift? When I try the below, nothing gets updated (upon hitting "add constraint").

Answer 1

This is the code you need to add in Swift 3:

class InsetLabel: UILabel {
    let topInset = CGFloat(0)
    let bottomInset = CGFloat(0)
    let leftInset = CGFloat(20)
    let rightInset = CGFloat(20)

    override func drawText(in rect: CGRect) {
        let insets: UIEdgeInsets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
    }

    override public var intrinsicContentSize: CGSize {
        var intrinsicSuperViewContentSize = super.intrinsicContentSize
        intrinsicSuperViewContentSize.height += topInset + bottomInset
        intrinsicSuperViewContentSize.width += leftInset + rightInset
        return intrinsicSuperViewContentSize
    }
}

Answer 2

Probably the best idea is to subclass UILabel and override drawTextInRect: like this:

class InsetLabel: UILabel {
    override func drawTextInRect(rect: CGRect) {
        super.drawTextInRect(UIEdgeInsetsInsetRect(rect, UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 20)))
    }
}

SWIFT 4+:

class InsetLabel: UILabel {
    override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 20)))
    }
}