How do I create custom property wrappers in Swift?

In Swift, custom property wrappers are a powerful feature that allows you to encapsulate and reuse code that implements property behaviors. A property wrapper is defined by creating a struct or class that wraps a value, providing additional functionality in terms of storage, validation, or transformation.

Creating a Custom Property Wrapper

To create a custom property wrapper, use the `@propertyWrapper` attribute followed by defining a struct or class. You'll typically need a wrapped value and optional logic to handle get, set, and initialization of that value.

Example of a Custom Property Wrapper


        @propertyWrapper
        struct Uppercase {
            var wrappedValue: String {
                didSet {
                    wrappedValue = wrappedValue.uppercased()
                }
            }

            init(wrappedValue: String) {
                self.wrappedValue = wrappedValue.uppercased()
            }
        }

        struct Example {
            @Uppercase var name: String

            init(name: String) {
                self.name = name
            }
        }

        let example = Example(name: "john doe")
        print(example.name)  // Output: JOHN DOE

How do I create custom property wrappers in Swift?

Creating a Custom Property Wrapper

Example of a Custom Property Wrapper

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How do I create custom property wrappers in Swift?

Creating a Custom Property Wrapper

Example of a Custom Property Wrapper

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Popular Topics

Recent Languages