CGFloat+pixelToPoints.swift

import UIKit

extension CGFloat {
    
    /** Targeting the Photo Book API, converts pixels to points */
    var pixelToPoints: CGFloat {
        let pointsPerInch: CGFloat = 72
        let scale: CGFloat = UIScreen.main.scale
        let pixelPerInch: CGFloat
        if UIDevice.current.userInterfaceIdiom == .pad {
            pixelPerInch = 132 * scale
        } else if UIDevice.current.userInterfaceIdiom == .phone {
            pixelPerInch = 163 * scale
        } else {
            pixelPerInch = 160 * scale
        }
        return self * pointsPerInch / pixelPerInch
    }
    
}