UILayoutGuide_Spacing.swift

UILayoutGuide.swift

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Buttons
        let saveButton = UIButton()
        saveButton.translatesAutoresizingMaskIntoConstraints = false
        saveButton.setTitle("Save", forState: .Normal)
        saveButton.setTitleColor(UIColor.blackColor(), forState: .Normal)
        view.addSubview(saveButton)
        saveButton.centerYAnchor.constraintEqualToAnchor(view.centerYAnchor).active = true
        saveButton.leadingAnchor.constraintEqualToAnchor(view.leadingAnchor).active = true

        let cancelButton = UIButton()
        cancelButton.translatesAutoresizingMaskIntoConstraints = false
        cancelButton.setTitle("Cancel", forState: .Normal)
        cancelButton.setTitleColor(UIColor.blackColor(), forState: .Normal)
        view.addSubview(cancelButton)
        cancelButton.centerYAnchor.constraintEqualToAnchor(view.centerYAnchor).active = true

        let clearButton = UIButton()
        clearButton.translatesAutoresizingMaskIntoConstraints = false
        clearButton.setTitle("Clear", forState: .Normal)
        clearButton.setTitleColor(UIColor.blackColor(), forState: .Normal)
        view.addSubview(clearButton)
        clearButton.centerYAnchor.constraintEqualToAnchor(view.centerYAnchor).active = true
        clearButton.trailingAnchor.constraintEqualToAnchor(view.trailingAnchor).active = true


        // Constraints
        let space1 = UILayoutGuide()
        view.addLayoutGuide(space1)

        let space2 = UILayoutGuide()
        view.addLayoutGuide(space2)

        space1.widthAnchor.constraintEqualToAnchor(space2.widthAnchor).active = true

        saveButton.trailingAnchor.constraintEqualToAnchor(space1.leadingAnchor).active = true

        cancelButton.leadingAnchor.constraintEqualToAnchor(space1.trailingAnchor).active = true
        cancelButton.trailingAnchor.constraintEqualToAnchor(space2.leadingAnchor).active = true

        clearButton.leadingAnchor.constraintEqualToAnchor(space2.trailingAnchor).active = true
    }
}