Dictionary<\/code> are all structs), while much of UIKit is built on classes. That split isn’t an accident. Once you understand why, the decision gets much easier.<\/p>\n\n\n\n
\n\n\n\nMeet the Two: What Is a Struct and What Is a Class?<\/h3>\n\n\n\n
Before comparing them, let’s look at each one on its own.<\/p>\n\n\n\n
<\/p>\n\n\n\n
What is a struct?<\/h4>\n\n\n\n
A struct is a way to group related values into a single, custom type. Think of it as a small container of data with some behavior attached. You define what it holds (properties) and what it can do (methods), and Swift handles the rest.<\/p>\n\n\n\n
struct User {\n var name: String\n var age: Int\n\n func greeting() -> String {\n \"Hi, I'm \\(name)!\"\n }\n}\n\nvar user = User(name: \"Reza\", age: 30)\nprint(user.greeting()) \/\/ Hi, I'm Reza!<\/pre>\n\n\n\nNotice that you didn’t write an initializer. Swift generates one for you automatically. The most important thing to remember about a struct is that it’s a value type<\/strong>. Every time you pass it around or assign it to a new variable, you get your own copy. It behaves a lot like a plain number or a string: if you copy 5<\/code>, you don’t expect changing one copy to change the other.<\/p>\n\n\n\nHow about a class?<\/h4>\n\n\n\n
A class is also a blueprint for a custom type with properties and methods, but it works more like a real “thing” that exists once and can be pointed to from many places.<\/p>\n\n\n\n
class Player {\n var name: String\n var score: Int\n\n init(name: String, score: Int) {\n self.name = name\n self.score = score\n }\n\n func addPoints(_ points: Int) {\n score += points\n }\n}\n\nlet player = Player(name: \"Sara\", score: 0)\nplayer.addPoints(10)<\/pre>\n\n\n\nHere you have to write your own init<\/code>, and you can modify score<\/code> even though player<\/code> is declared with let<\/code>. That’s because a class is a reference type<\/strong>. The variable doesn’t hold the object itself, only a reference to it. Anyone else holding that same reference is looking at the very same object.<\/p>\n\n\n\nClasses also bring extra abilities that structs don’t have: they can inherit from other classes, they can be checked for identity, and they can clean up after themselves with a deinit<\/code>.<\/p>\n\n\n\n
\n\n\n\nHmm OK so What are the Differences?<\/h3>\n\n\n\n
The biggest difference is that structs are value types and classes are reference types<\/strong>. Everything else follows from that.<\/p>\n\n\n\nWhen you assign a struct to a new variable, you get an independent copy:<\/p>\n\n\n\n
struct Point {\n var x: Int\n var y: Int\n}\n\nvar a = Point(x: 1, y: 2)\nvar b = a\nb.x = 99\n\nprint(a.x) \/\/ 1\nprint(b.x) \/\/ 99<\/pre>\n\n\n\nChanging b<\/code> doesn’t touch a<\/code>. Each has its own data.<\/p>\n\n\n\nWith a class, both variables point to the same instance:<\/p>\n\n\n\n
class Counter {\n var value = 0\n}\n\nlet c1 = Counter()\nlet c2 = c1\nc2.value = 5\n\nprint(c1.value) \/\/ 5<\/pre>\n\n\n\nHere c1<\/code> and c2<\/code> are two names for one object. Change it through either and both see the change.<\/p>\n\n\n\nA few other differences are worth knowing:<\/p>\n\n\n\n
\n- Inheritance.<\/strong> Classes can inherit from other classes. Structs can’t. If you want to share behavior across structs, you use protocols and extensions instead.<\/li>\n\n\n\n
- Initializers.<\/strong> Structs get a free memberwise initializer. Classes don’t, so you write your own
init<\/code>.<\/li>\n\n\n\n- Mutability.<\/strong> A struct declared with
let<\/code> is fully immutable, including its properties. A class declared with let<\/code> only means the reference can’t change, and you can still modify the properties inside it.<\/li>\n\n\n\n- Identity.<\/strong> Classes have identity. You can ask whether two variables point to the same<\/em> object using
===<\/code>. Structs only have equality (are the values the same?), never identity.<\/li>\n\n\n\n- Deinitializers.<\/strong> Only classes have
deinit<\/code>, which runs when the last reference disappears. That’s useful for cleaning up resources like file handles or observers.<\/li>\n\n\n\n- Reference counting.<\/strong> Classes are managed by ARC, so retain cycles and
weak<\/code>\/unowned<\/code> references are something you have to think about. Structs don’t have that problem.<\/li>\n\n\n\n- Objective-C interop.<\/strong> If you need to subclass
NSObject<\/code> or work with Objective-C APIs, you need a class.<\/li>\n<\/ul>\n\n\n\n
\n\n\n\nWhere They Live in Memory<\/h3>\n\n\n\n
You’ll often hear the short version: structs live on the stack, classes live on the heap.<\/em> It’s a good starting point, but it’s only partly true.<\/p>\n\n\n\nThe stack<\/strong> is fast and simple. Memory is allocated and freed automatically as functions are entered and exited, with almost no overhead. The heap<\/strong> is more flexible, since data can outlive the function that created it, but allocating and freeing memory there is slower and has to be tracked. That’s what ARC is doing for you behind the scenes.<\/p>\n\n\n\nClass instances always live on the heap. The variable you hold is just a reference (a pointer) to it, and copying that variable copies the pointer, not the object.<\/p>\n\n\n\n
Structs are often<\/em> stored on the stack, or directly inline inside whatever contains them. But there are plenty of exceptions:<\/p>\n\n\n\n\n- If a struct is a property of a class, it lives inside that class’s heap allocation.<\/li>\n\n\n\n
- If a closure captures a struct, it may get moved to the heap.<\/li>\n\n\n\n
- A struct with a large collection inside, like an
Array<\/code>, keeps the actual elements in a heap buffer. The struct itself only holds a small header pointing to it. Swift uses copy-on-write here, so copying the array is cheap until one copy is modified.<\/li>\n<\/ul>\n\n\n\nSo the more accurate way to think about it is this: the value-versus-reference distinction is about semantics<\/em>, meaning how your code behaves. Stack versus heap is an optimization detail<\/em> the compiler is allowed to choose. Design around the semantics and let the compiler worry about placement.<\/p>\n\n\n\n
\n\n\n\nWhen and How to Choose<\/h3>\n\n\n\n
Apple’s own guidance is to start with a struct<\/strong> and switch to a class only when you have a reason. I agree with that. Here’s how I usually decide.<\/p>\n\n\n\nReach for a struct when:<\/strong><\/p>\n\n\n\n\n- The type is mostly data<\/em>: a user profile, a coordinate, a network response model, a configuration.<\/li>\n\n\n\n
- Equality should be based on values. Two
Point(x: 1, y: 2)<\/code> instances are the same thing regardless of where they came from.<\/li>\n\n\n\n- You want safety. Since every copy is independent, nobody can change your data from somewhere else in the app.<\/li>\n\n\n\n
- You don’t need inheritance.<\/li>\n<\/ul>\n\n\n\n
Reach for a class when:<\/strong><\/p>\n\n\n\n\n- You need shared, mutable state<\/strong>, where multiple parts of the app must see the same instance and its changes. A database connection, a cache, or an audio player are good examples.<\/li>\n\n\n\n
- Identity matters.<\/strong> This object represents one specific thing, not just a bundle of values.<\/li>\n\n\n\n
- You need inheritance<\/strong> or Objective-C interoperability, which is common with UIKit (
UIViewController<\/code>, UIView<\/code>) and other framework base classes.<\/li>\n\n\n\n- You need
deinit<\/code> to clean up when the object goes away.<\/li>\n<\/ul>\n\n\n\nA quick gut-check I like is to ask: “If I copied this, would it still make sense?”<\/em> A copy of a coordinate makes perfect sense. A copy of a network manager or a live camera session usually doesn’t, because there should only be one of them.<\/p>\n\n\n\nAlso keep in mind that this isn’t an either\/or choice for a whole app. Many well-designed codebases use structs for models and state, and classes for the few objects that own resources or coordinate work. In SwiftUI, for example, your views and most of your data are structs, while shared observable state is often a class.<\/p>\n\n\n\n
One last practical warning: don’t pick a class “for performance” without measuring. Copying small structs is cheap, and heap allocation plus reference counting can actually cost more. Choose based on meaning first, then optimize if a profiler tells you to.<\/p>\n\n\n\n
\n\n\n\nHow should I answer it in a interview?<\/h3>\n\n\n\n
I would say something like:<\/p>\n\n\n\n
\nThe biggest difference is that a struct is a value type and a class is a reference type. When you copy a struct, you get a new independent copy. When you copy a class, both variables point to the same object in memory. Also, classes support inheritance and have deinitializers, but structs don’t. In my daily work, I use struct by default. I only choose class when I need shared state, identity, or inheritance.<\/p>\n<\/blockquote>\n\n\n\n
Possible follow-up question:<\/strong> “What is copy-on-write, and does it apply to structs?”<\/p>\n\n\n\n\nAnswer:<\/strong><\/p>\n\n\n\nCopy-on-write means Swift doesn’t copy the data right away when you assign a collection to another variable. Both variables share the same storage until one of them changes something. Only then does Swift make a real copy. So we get value semantics, but we don’t pay the cost of copying every time. It’s built into Array, Dictionary, and String. For our own structs it doesn’t happen automatically. We need to implement it ourselves, for example with isKnownUniquelyReferenced<\/code>.<\/p>\n<\/blockquote>\n\n\n\n
\n\n\n\nConclusion<\/h3>\n\n\n\n
Classes and structs look like twins, but they behave very differently because of one idea: structs are copied, and classes are shared. That single difference shapes how safe your code is, how easy it is to reason about, and how your data moves through memory.<\/p>\n\n\n\n
Default to structs. They’re simpler, safer, and fit naturally with how Swift is designed. When you genuinely need shared state, identity, inheritance, or cleanup logic, switch to a class and do it on purpose. If you’re ever unsure, go back to that small question: does it make sense to copy this thing? Your answer will usually tell you what you need to know.<\/p>\n","protected":false},"excerpt":{"rendered":"
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