{"id":1906,"date":"2024-11-04T16:00:00","date_gmt":"2024-11-04T16:00:00","guid":{"rendered":"https:\/\/dev95.site\/anyclass-protocol-and-objective-c-methods\/"},"modified":"2024-11-04T16:00:00","modified_gmt":"2024-11-04T16:00:00","slug":"anyclass-protocol-and-objective-c-methods","status":"publish","type":"post","link":"https:\/\/dev95.site\/ar\/anyclass-protocol-and-objective-c-methods\/","title":{"rendered":"AnyClass protocol and Objective-C methods"},"content":{"rendered":"<div id=\"dev95-64766297\" class=\"dev95-- dev95-entity-placement\"><script async=\"async\" data-cfasync=\"false\" src=\"https:\/\/pl27862732.profitableratecpmnetwork.com\/2ad7a50e0bbc23ac6801d7b77c501463\/invoke.js\"><\/script>\r\n<div id=\"container-2ad7a50e0bbc23ac6801d7b77c501463\"><\/div><\/div><div>\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/developer.apple.com\/documentation\/swift\/anyclass\">AnyClass<\/a> is a protocol all classes conform to and it comes with a feature I was not aware of. But first, how to I ended up with using AnyClass. While working on code using CoreData, I needed a way to enumerate all the CoreData entities and call a static function on them. If that function is defined, it runs an entity specific update. Let\u2019s call the function <code>static func resetState()<\/code>. <\/p>\n<p class=\"wp-block-paragraph\">It is easy to get the list of entity names of the model and then turn them into AnyClass instances using the <a href=\"https:\/\/developer.apple.com\/documentation\/foundation\/1395135-nsclassfromstring\">NSClassFromString()<\/a> function.<\/p><div id=\"dev95-1371874994\" class=\"dev95- dev95-entity-placement\"><center>\r\n<script>\r\n  atOptions = {\r\n    'key' : '4ba6b6513c00e0ba76511f798ae56401',\r\n    'format' : 'iframe',\r\n    'height' : 50,\r\n    'width' : 320,\r\n    'params' : {}\r\n  };\r\n<\/script>\r\n<script src=\"https:\/\/www.highrevenueformat.com\/4ba6b6513c00e0ba76511f798ae56401\/invoke.js\"><\/script>\r\n\t<\/center><\/div>\n<figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler\">\n<div class=\"wp-block-embed__wrapper\">\n<style>.gist table { margin-bottom: 0; }<\/style>\n<div style=\"tab-size: 8\" id=\"gist133263827\" class=\"gist\">\n<div class=\"gist-file\" translate=\"no\" data-color-mode=\"light\" data-light-theme=\"light\">\n<div class=\"gist-data\">\n<div class=\"js-gist-file-update-container js-task-list-container\">\n<div id=\"file-anyclass-swift\" class=\"file my-2\">\n<div itemprop=\"text\" class=\"Box-body p-0 blob-wrapper data type-swift\" style=\"overflow: auto\" tabindex=\"0\" role=\"region\" aria-label=\"AnyClass.swift content, created by laevandus on 02:34PM on October 10, 2024.\">\n<div class=\"js-check-hidden-unicode js-blob-code-container blob-code-content\">\n<p>  <template class=\"js-file-alert-template\"><\/p>\n<div data-view-component=\"true\" class=\"flash flash-warn flash-full d-flex flex-items-center\">\n  <svg aria-hidden=\"true\" data-component=\"Octicon\" height=\"16\" viewbox=\"0 0 16 16\" version=\"1.1\" width=\"16\" data-view-component=\"true\" class=\"octicon octicon-alert\">\n    <path d=\"M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"><\/path>\n<\/svg><br \/>\n    <span><br \/>\n      This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.<br \/>\n      <a class=\"Link--inTextBlock\" href=\"https:\/\/github.co\/hiddenchars\" target=\"_blank\">Learn more about bidirectional Unicode characters<\/a><br \/>\n    <\/span><\/p>\n<div data-view-component=\"true\" class=\"flash-action\">        <a href=\"https:\/\/augmentedcode.io\/2024\/11\/04\/anyclass-protocol-and-objective-c-methods\/%7B%7B%20revealButtonHref%20%7D%7D\" data-view-component=\"true\" class=\"btn-sm btn\">    Show hidden characters<br \/>\n<\/a>\n<\/div>\n<\/div>\n<p><\/template><br \/>\n<template class=\"js-line-alert-template\"><br \/>\n  <span aria-label=\"This line has hidden Unicode characters\" data-view-component=\"true\" class=\"line-alert tooltipped tooltipped-e\"><br \/>\n    <svg aria-hidden=\"true\" data-component=\"Octicon\" height=\"16\" viewbox=\"0 0 16 16\" version=\"1.1\" width=\"16\" data-view-component=\"true\" class=\"octicon octicon-alert\">\n    <path d=\"M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"><\/path>\n<\/svg><br \/>\n<\/span><\/template><\/p>\n<table data-hpc class=\"highlight tab-size js-file-line-container\" data-tab-size=\"4\" data-paste-markdown-skip data-tagsearch-path=\"AnyClass.swift\">\n<tr>\n<td id=\"file-anyclass-swift-L1\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"1\"><\/td>\n<td id=\"file-anyclass-swift-LC1\" class=\"blob-code blob-code-inner js-file-line\"><span class=\"pl-k\">let<\/span> <span class=\"pl-s1\">entityClasses<\/span> <span class=\"pl-c1\">=<\/span> managedObjectModel<span class=\"pl-kos\">.<\/span>entities<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L2\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"2\"><\/td>\n<td id=\"file-anyclass-swift-LC2\" class=\"blob-code blob-code-inner js-file-line\">    <span class=\"pl-kos\">.<\/span><span class=\"pl-en\">compactMap<\/span><span class=\"pl-kos\">(<\/span><span class=\"pl-kos\">.<\/span>name<span class=\"pl-kos\">)<\/span><\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L3\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"3\"><\/td>\n<td id=\"file-anyclass-swift-LC3\" class=\"blob-code blob-code-inner js-file-line\">    <span class=\"pl-kos\">.<\/span><span class=\"pl-en\">compactMap<\/span> <span class=\"pl-kos\">{<\/span> <span class=\"pl-en\">NSClassFromString<\/span><span class=\"pl-kos\">(<\/span>$0<span class=\"pl-kos\">)<\/span> <span class=\"pl-kos\">}<\/span><\/td>\n<\/tr>\n<\/table>\n<\/div><\/div>\n<\/p><\/div>\n<\/div><\/div>\n<div class=\"gist-meta\">\n        <a href=\"https:\/\/gist.github.com\/laevandus\/0e87c16a389868d9fa517390693ee0f0\/raw\/de109b15031c8c2322afd11d15eb8dbdc7ca5727\/AnyClass.swift\" style=\"float:right\" class=\"Link--inTextBlock\">view raw<\/a><br \/>\n        <a href=\"https:\/\/gist.github.com\/laevandus\/0e87c16a389868d9fa517390693ee0f0#file-anyclass-swift\" class=\"Link--inTextBlock\"><br \/>\n          AnyClass.swift<br \/>\n        <\/a><br \/>\n        hosted with \u2764 by <a class=\"Link--inTextBlock\" href=\"https:\/\/github.com\/\">GitHub<\/a>\n      <\/div>\n<\/p><\/div>\n<\/div>\n<\/div>\n<\/figure>\n<p class=\"wp-block-paragraph\">At this point I had an array of AnyClass instances where some of them  implemented the resetState function, some didn\u2019t. While browsing the AnyClass documentation, I saw this:<\/p>\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">You can use the\u00a0<code>AnyClass<\/code>\u00a0protocol as the concrete type for an instance of any class. When you do, all known\u00a0<code>@objc<\/code>class methods and properties are available as implicitly unwrapped optional methods and properties, respectively.<\/p>\n<\/blockquote>\n<p class=\"wp-block-paragraph\">Never heard about it, probably because I have never really needed to interact with AnyClass in such way. Therefore, If I create an <code>@objc static function<\/code> then I can call it by unwrapping it with <code>?<\/code>. Without unwrapping it safely, it would crash because <code>Department<\/code> type does not implement the function.<\/p>\n<figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler\">\n<div class=\"wp-block-embed__wrapper\">\n<style>.gist table { margin-bottom: 0; }<\/style>\n<div style=\"tab-size: 8\" id=\"gist133264076\" class=\"gist\">\n<div class=\"gist-file\" translate=\"no\" data-color-mode=\"light\" data-light-theme=\"light\">\n<div class=\"gist-data\">\n<div class=\"js-gist-file-update-container js-task-list-container\">\n<div id=\"file-anyclass-swift\" class=\"file my-2\">\n<div itemprop=\"text\" class=\"Box-body p-0 blob-wrapper data type-swift\" style=\"overflow: auto\" tabindex=\"0\" role=\"region\" aria-label=\"AnyClass.swift content, created by laevandus on 02:46PM on October 10, 2024.\">\n<div class=\"js-check-hidden-unicode js-blob-code-container blob-code-content\">\n<p>  <template class=\"js-file-alert-template\"><\/p>\n<div data-view-component=\"true\" class=\"flash flash-warn flash-full d-flex flex-items-center\">\n  <svg aria-hidden=\"true\" data-component=\"Octicon\" height=\"16\" viewbox=\"0 0 16 16\" version=\"1.1\" width=\"16\" data-view-component=\"true\" class=\"octicon octicon-alert\">\n    <path d=\"M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"><\/path>\n<\/svg><br \/>\n    <span><br \/>\n      This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.<br \/>\n      <a class=\"Link--inTextBlock\" href=\"https:\/\/github.co\/hiddenchars\" target=\"_blank\">Learn more about bidirectional Unicode characters<\/a><br \/>\n    <\/span><\/p>\n<div data-view-component=\"true\" class=\"flash-action\">        <a href=\"https:\/\/augmentedcode.io\/2024\/11\/04\/anyclass-protocol-and-objective-c-methods\/%7B%7B%20revealButtonHref%20%7D%7D\" data-view-component=\"true\" class=\"btn-sm btn\">    Show hidden characters<br \/>\n<\/a>\n<\/div>\n<\/div>\n<p><\/template><br \/>\n<template class=\"js-line-alert-template\"><br \/>\n  <span aria-label=\"This line has hidden Unicode characters\" data-view-component=\"true\" class=\"line-alert tooltipped tooltipped-e\"><br \/>\n    <svg aria-hidden=\"true\" data-component=\"Octicon\" height=\"16\" viewbox=\"0 0 16 16\" version=\"1.1\" width=\"16\" data-view-component=\"true\" class=\"octicon octicon-alert\">\n    <path d=\"M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"><\/path>\n<\/svg><br \/>\n<\/span><\/template><\/p>\n<table data-hpc class=\"highlight tab-size js-file-line-container\" data-tab-size=\"4\" data-paste-markdown-skip data-tagsearch-path=\"AnyClass.swift\">\n<tr>\n<td id=\"file-anyclass-swift-L1\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"1\"><\/td>\n<td id=\"file-anyclass-swift-LC1\" class=\"blob-code blob-code-inner js-file-line\">class Department: NSManagedObject {<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L2\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"2\"><\/td>\n<td id=\"file-anyclass-swift-LC2\" class=\"blob-code blob-code-inner js-file-line\">}<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L3\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"3\"><\/td>\n<td id=\"file-anyclass-swift-LC3\" class=\"blob-code blob-code-inner js-file-line\">\n<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L4\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"4\"><\/td>\n<td id=\"file-anyclass-swift-LC4\" class=\"blob-code blob-code-inner js-file-line\">class Employee: NSManagedObject {<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L5\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"5\"><\/td>\n<td id=\"file-anyclass-swift-LC5\" class=\"blob-code blob-code-inner js-file-line\">    @objc static func resetState() {<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L6\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"6\"><\/td>\n<td id=\"file-anyclass-swift-LC6\" class=\"blob-code blob-code-inner js-file-line\">        print(&#8220;Resetting Employee&#8221;)<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L7\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"7\"><\/td>\n<td id=\"file-anyclass-swift-LC7\" class=\"blob-code blob-code-inner js-file-line\">    }<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L8\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"8\"><\/td>\n<td id=\"file-anyclass-swift-LC8\" class=\"blob-code blob-code-inner js-file-line\">}<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L9\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"9\"><\/td>\n<td id=\"file-anyclass-swift-LC9\" class=\"blob-code blob-code-inner js-file-line\">\n<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L10\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"10\"><\/td>\n<td id=\"file-anyclass-swift-LC10\" class=\"blob-code blob-code-inner js-file-line\">\/\/ This triggers Employee.resetState and prints the message to the console<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L11\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"11\"><\/td>\n<td id=\"file-anyclass-swift-LC11\" class=\"blob-code blob-code-inner js-file-line\">for entityClass in entityClasses {<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L12\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"12\"><\/td>\n<td id=\"file-anyclass-swift-LC12\" class=\"blob-code blob-code-inner js-file-line\">    entityClass.resetState?()<\/td>\n<\/tr>\n<tr>\n<td id=\"file-anyclass-swift-L13\" class=\"blob-num js-line-number js-blob-rnum\" data-line-number=\"13\"><\/td>\n<td id=\"file-anyclass-swift-LC13\" class=\"blob-code blob-code-inner js-file-line\">}<\/td>\n<\/tr>\n<\/table>\n<\/div><\/div>\n<\/p><\/div>\n<\/div><\/div>\n<div class=\"gist-meta\">\n        <a href=\"https:\/\/gist.github.com\/laevandus\/2760942c5904b411700b63cacad9d269\/raw\/c3c76eb1075f3d0e9ac0888c5cd14307b9d14926\/AnyClass.swift\" style=\"float:right\" class=\"Link--inTextBlock\">view raw<\/a><br \/>\n        <a href=\"https:\/\/gist.github.com\/laevandus\/2760942c5904b411700b63cacad9d269#file-anyclass-swift\" class=\"Link--inTextBlock\"><br \/>\n          AnyClass.swift<br \/>\n        <\/a><br \/>\n        hosted with \u2764 by <a class=\"Link--inTextBlock\" href=\"https:\/\/github.com\/\">GitHub<\/a>\n      <\/div>\n<\/p><\/div>\n<\/div>\n<\/div>\n<\/figure>\n<p class=\"wp-block-paragraph\">It has been awhile since I wrote any Objective-C code, but its features leaking into Swift helped me out here. Reminds me of days filled with <a href=\"https:\/\/developer.apple.com\/documentation\/objectivec\/1418956-nsobject\/1418583-respondstoselector\">respondsToSelector<\/a> and <a href=\"https:\/\/developer.apple.com\/documentation\/objectivec\/1418956-nsobject\/1418867-performselector\">performSelector<\/a>.<\/p>\n<p class=\"wp-block-paragraph\">If this was helpful, please let me know on <a href=\"https:\/\/mastodon.social\/@toomasvahter\" target=\"_blank\" rel=\"noreferrer noopener\">Mastodon@toomasvahter<\/a> or\u00a0<a rel=\"noreferrer noopener\" href=\"https:\/\/twitter.com\/toomasvahter\" target=\"_blank\">Twitter @toomasvahter<\/a>. Feel free to subscribe to <a rel=\"noreferrer noopener\" aria-label=\"RSS feed (opens in a new tab)\" href=\"https:\/\/augmentedcode.io\/blog\/feed\/\" target=\"_blank\">RSS feed<\/a>. 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But first, how to I ended up with using AnyClass. 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