XIB + Storyboard Localization

Localization.swift

//
//  Localization.swift
//  
//
//  Created by Frank Lehmann on 03.07.19.
//  Based on: https://medium.com/@mario.negro.martin/easy-xib-and-storyboard-localization-b2794c69c9db
//

import UIKit

public extension String {
    var localized: String { NSLocalizedString(self, comment: "") }    
    var loc: String { localized }
}

protocol XIBLocalizable {
    var xibStringKey: String? { get set }
}

extension UILabel: XIBLocalizable {
    private static var _uppercaseStore = [String:Bool]()
    private static var _xibStringStore = [String:String]()
    
    private func reloadText() {
        let _text = (xibStringKey ?? text)?.localized
        text = isUppercased ? _text?.uppercased() : _text
    }
    
    @IBInspectable
    var isUppercased: Bool {
        get {
            let tmpAddress = String(format: "%p", unsafeBitCast(self, to: Int.self))
            return UILabel._uppercaseStore[tmpAddress] ?? false
        }
        set {
            let tmpAddress = String(format: "%p", unsafeBitCast(self, to: Int.self))
            UILabel._uppercaseStore[tmpAddress] = newValue
            reloadText()
        }
    }
    
    @IBInspectable
    var xibStringKey: String? {
        get {
            let tmpAddress = String(format: "%p", unsafeBitCast(self, to: Int.self))
            return UILabel._xibStringStore[tmpAddress]
        }
        set {
            let tmpAddress = String(format: "%p", unsafeBitCast(self, to: Int.self))
            UILabel._xibStringStore[tmpAddress] = newValue
            reloadText()
        }
    }
}

extension UIButton: XIBLocalizable {
    @IBInspectable
    var xibStringKey: String? {
        get { return nil }
        set {
            setTitle(newValue?.localized, for: .normal)
        }
    }
}

extension UIBarButtonItem: XIBLocalizable {
    @IBInspectable
    var xibStringKey: String? {
        get { return nil }
        set {
            title = newValue?.localized
        }
    }
}

extension UITextField: XIBLocalizable {
    @IBInspectable
    var xibStringKey: String? {
        get { return nil }
        set {
            text = newValue?.localized
        }
    }
    
    @IBInspectable
    var xibPlaceholderKey: String? {
        get { return nil }
        set {
            placeholder = newValue?.localized
        }
    }
}