Swift - Avoid magic numbers

Dimens.swift

import UIKit

**
 All view dimensions used in the app
 */
struct Dimens {
    
    /**
     Common dimensions - used across the app
    */
    struct Common {
        
        /** Horizontal Margins from left and right edges of screen */
        static let horizontalMargin: CGFloat = 20.0
        
        /** Vertical Margin from top and bottom edges of screen */
        static let verticalMargin: CGFloat = 20.0
        
    }
    
    
    /**
     Text sizes - used across the app
     */
    struct Text {
        
        /** Title font size */
        static let title: CGFloat = 18.0

        /** Sub-title font size */
        static let subTitle: CGFloat = 16.0
        
        /** Body text font size */
        static let bodyText: CGFloat = 14.0
        
    }
    
    
    /**
      Rooms & Profesional Filters views
     */
    struct FilterView {
        
        static let subCategoryLeftMargin: CGFloat = 40.0
        
        static let titleHeight: CGFloat = 36.0;
        
    }
    
    
    
}


// Example usage

class FilterViewController: UIViewController {
    
    var titleLabel: UILabel!
    
    override func viewDidLoad() {
        
        titleLabel.font = UIFont.systemFont(ofSize: Dimens.Text.title)
        titleLabel.bounds.size.height = Dimens.FilterView.titleHeight
    
    }
    
}