{"id":1990,"date":"2025-08-05T13:08:13","date_gmt":"2025-08-05T13:08:13","guid":{"rendered":"https:\/\/www.cmarix.com\/qanda\/?p=1990"},"modified":"2026-02-05T11:59:53","modified_gmt":"2026-02-05T11:59:53","slug":"classes-vs-structures-in-swift","status":"publish","type":"post","link":"https:\/\/www.cmarix.com\/qanda\/classes-vs-structures-in-swift\/","title":{"rendered":"Explain Classes vs Structures in Swift"},"content":{"rendered":"\n<p>In Swift, both classes and structures are used to define custom data types \u2014 but they have different behaviors, especially in memory management, inheritance, and value\/reference semantics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Basic Definitions of Classes and Structures in Swift<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Structure (struct)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Value type: copied when assigned or passed.<\/li>\n\n\n\n<li>Stored in the stack (usually, if small\/simple).<\/li>\n\n\n\n<li>Preferred for small, lightweight models.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>struct Person {\n    var name: String\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Class<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reference type: passed by reference.<\/li>\n\n\n\n<li>Stored in the heap.<\/li>\n\n\n\n<li>Supports inheritance, deinitializers, and identity checks.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>class Person {\n    var name: String\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Key Differences Between Struct vs Class in iOS<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Feature<\/strong><\/td><td><strong>Struct<\/strong><\/td><td><strong>Class<\/strong><\/td><\/tr><tr><td><strong>Type<\/strong><\/td><td>Value type<\/td><td>Reference type<\/td><\/tr><tr><td><strong>Copy behavior<\/strong><\/td><td>Copies on assignment<\/td><td>Shares the same instance<\/td><\/tr><tr><td><strong>Inheritance<\/strong><\/td><td>Not supported<\/td><td>Supported<\/td><\/tr><tr><td><strong>Deinitializer<\/strong><\/td><td>Not allowed<\/td><td>deinit available<\/td><\/tr><tr><td><strong>Identity (===) check<\/strong><\/td><td>Not applicable<\/td><td>Can check reference identity<\/td><\/tr><tr><td><strong>Storage<\/strong><\/td><td>Stack (small data)<\/td><td>Heap<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Value vs Reference Behavior<\/h3>\n\n\n\n<p><strong>1. Struct (Value Type)<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>struct User {\n    var name: String\n}\nvar user1 = User(name: \"Alice\")\nvar user2 = user1\nuser2.name = \"Bob\"\nprint(user1.name) \/\/ \"Alice\"\nprint(user2.name) \/\/ \"Bob\"<\/code><\/pre>\n\n\n\n<p>Changing user2 doesn&#8217;t affect user1 because structs are copied.<\/p>\n\n\n\n<p><strong>2. Class (Reference Type)<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class User {\n    var name: String\n    init(name: String) {\n        self.name = name\n    }\n}\n\nvar user1 = User(name: \"Alice\")\nvar user2 = user1\nuser2.name = \"Bob\"\n\nprint(user1.name) \/\/ \"Bob\"\nprint(user2.name) \/\/ \"Bob\"<\/code><\/pre>\n\n\n\n<p>Both user1 and user2 point to the same object in memory.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Use structs when you need simple, independent copies of data. Use classes when you need shared references, inheritance, or lifecycle control. For best architecture decisions in your app, consider hiring an iOS developer who understands when to use each effectively.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Swift, both classes and structures are used to define custom data types \u2014 but they have different behaviors, especially in memory management, inheritance, and value\/reference semantics. Basic Definitions of Classes and Structures in Swift Structure (struct) Class Key Differences Between Struct vs Class in iOS Feature Struct Class Type Value type Reference type Copy [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1991,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,161],"tags":[],"class_list":["post-1990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mobile","category-swift"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/posts\/1990","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/comments?post=1990"}],"version-history":[{"count":2,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/posts\/1990\/revisions"}],"predecessor-version":[{"id":1994,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/posts\/1990\/revisions\/1994"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/media\/1991"}],"wp:attachment":[{"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/media?parent=1990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/categories?post=1990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/tags?post=1990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}