AssociatedObject

Swift Macro for allowing variable declarations even in class extensions. It is implemented by wrapping objc_getAssociatedObject/objc_setAssociatedObject.

Usage

For example, you can add a new stored property to UIViewController by declaring the following

import AssociatedObject

extension UIViewController {
    @AssociatedObject(.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
    var text = "text"
}

Declared properties can be used as follows

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        print(text) // => "text"

        text = "hello"
        print(text) // => "hello"
    }

}

License

AssociatedObject is released under the MIT License. See LICENSE