Auto resizing label in Swift with Auto Layout

AutoResizingLabel.swift

//
//  AutoResizingLabel.swift
//
//  Created by karthikeyan on 3/23/16.
//  Copyright © 2016 karthikeyan All rights reserved.
//

import Foundation
import UIKit

class AutoResizingLabel: UIView {
    
    //MARK:- Private instance variables
    private var label: UILabel!
    
    //MARK:- Public instance variables
    var font: UIFont = UIFont.systemFontOfSize(18) {
        didSet {
            label.font = font
        }
    }
    
    var text: String = "Sample text" {
        didSet {
            label.text = text
        }
    }
    
    //MARK:- Life cycle methods
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupView()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupView()
    }
    
    //MARK:- Private helper methods
    private func setupView() {
        
        setupLabel()
        
        setContentHuggingPriority(UILayoutPriorityRequired, forAxis: .Horizontal)
        setContentHuggingPriority(UILayoutPriorityRequired, forAxis: .Vertical)
        
        setContentCompressionResistancePriority(UILayoutPriorityRequired, forAxis: .Horizontal)
        setContentCompressionResistancePriority(UILayoutPriorityRequired, forAxis: .Vertical)
        
        label.backgroundColor = .clearColor()
    }
    
    private func setupLabel() {
        
        label = UILabel()
        label.text = text
        label.numberOfLines = 0
        label.textAlignment = .Center
        label.translatesAutoresizingMaskIntoConstraints = false
        addSubview(label)
        
        label.centerXAnchor.constraintEqualToAnchor(centerXAnchor).active = true
        label.centerYAnchor.constraintEqualToAnchor(centerYAnchor).active = true
        
        label.setContentHuggingPriority(UILayoutPriorityRequired, forAxis: .Horizontal)
        label.setContentHuggingPriority(UILayoutPriorityRequired, forAxis: .Vertical)
        
        label.setContentCompressionResistancePriority(UILayoutPriorityRequired, forAxis: .Horizontal)
        label.setContentCompressionResistancePriority(UILayoutPriorityRequired, forAxis: .Vertical)
    }
}