Struct vs class: The main differences in Swift

Struct vs class swift are key components in most iOS applications. They help us organize and manage code into blocks in an intuitive and easy-to-use way. So coming to this blog, we will clarify the main differences between class vs struct in Swift and also learn more when we use them for proper collaboration.. Let’s go

What are struct and class Swift?

When its comes to the topic of struct vs class Swift, firstly, you must know what Struct is. In fact, it is a value type which allows your to change other instance if you change one instance, that contain:

  • protocol conformances
  • extensions
  • properties
  • methods
  • subscripts
  • initializers

Class is a reference type which doesn’t allow you to change another instance if you change one instance. It includes:

  • subscripts
  • initializers
  • protocol conformances
  • extensions
  • properties
  • methods

What are the differences between struct vs class Swift?

Generally, class vs struct Swift are pretty similar. However, there’s still lots of differences between them you need to know 

Value vs reference types

One of the most distinctions in struct vs class Swift is the type. As mentioned above, struct is a value type, meanwhile, class is a reference type. 

Reference of class indicates that each instance shares the data when you copy reference type. As a result, The reference itself is copied instead of its data references. In addition, whenever you change one, the other may change.

Value of struct, each instance maintains a unique copy of the data. In case you change one instance, the other still keeps .

The benefit of mutation in safety – struct vs class Swift

In case of having mutation, struct is better than class in mutation protection. Because no other part of your app is modifying the data at the same time. As a result, this makes it easier to reason about your code, which is particularly useful in multi-threaded environments where several threads can be modifying your data at the same time.

Besides that, ii it does not have any mutation appearance, the benefit of mutation also does not count. Therefore, structs act exactly the same as classes. 

Structs and constants

Struct was defined as a variable instead of the way we did with Class. There is a mutation if a struct defines as a variable.. Let’s see the following example:

Struct vs class

Structs get an initializer for free

The Class receives a defined initializer. On the other hand. Struct will get a free initializer 

 class and struct

Classes allow inheritance

Classes can inherit characteristics from other classes and thus act as abstract classes. This is often no longer required and can be replaced with protocols in Swift. Inheritance is only available with classes, whereas protocols can use both classes and structs.

Classes are ability to be deinitialized.

A deinit method on a class allows it to execute code just before it is destroyed.

When Should You Use struct and class Swift?


  • Using for simple data types
  • Choosing struct instead of class in a multi-threaded environment
  • Using structs within class types
  • Because Structs can’t inherit code from other structs, there are a few options for creating flexible code.


  • Using class for creating a subclass of UIViewController
  • Because of deinitialization of classes,you have permission to make one or more references to the same class
  • Comparing instance identity is needed by using ===


Hopefully, you got our helpful above information about The main differences between struct vs class Swift. In case you find some difficulty in Mobile application Development, let ArrowHitech team help you.