Property wrapper in Swift

Property wrapper in Swift

Property wrapper is the Swift language feature that allows us to define a custom type, that implements behavior from get and set methods, and reuse it everywhere.

Declare @propertyWrapper keyword before we declare the type that we want to use as property wrapper. It can be struct, class, or enum.

We are required to implement the wrappedValue property. Most of the time we declare custom setter and getter in this property. This property can be a computed or stored property.

Example of @Properywrapper

@propertyWrapper
struct Capitalized {
  private(set) var text: String = "" //Declared to store the value
  var wrappedValue: String {
    get { return text }
    set { text = newValue.uppercased() }
  }
}

//Now use it
struct User{
  @Capitalized var userName: String
}


var user = User()
user.userName = "Pawan"
print(user.userName) //PAWAN

Thanks for reading, Happy Coding 👨‍💻