NSDictionaryOfVariableBindings swift equivalent?

Question

The Apple documentation shows an unsettling blank space under the \'Creating a Dictionary\' section of the UIKit reference here.

Has anyone found a replacement for

Answer 1

Based on https://stackoverflow.com/a/55086673/1058199 by cherpak-evgeny, this UIViewController extension assumes that the container is self, the current viewController instance.

extension UIViewController {

    // Alex Zavatone 06/04/2019
    // Using reflection, get the string name of the UIView properties passed in
    // to create a dictionary of ["viewPropertyName": viewPropertyObject…] like
    // Objective-C's NSDictionaryForVariableBindings.
    func dictionaryOfBindings(_ arrayOfViews:[UIView?]) -> Dictionary {
        var bindings = Dictionary()
        let viewMirror = Mirror(reflecting: self)
        let _ = viewMirror.children.compactMap {
            guard let name = $0.label, let view = $0.value as? UIView else { return }
            guard arrayOfViews.contains(view) else { return }
            bindings[name] = view
        }
        return bindings
    }
}

Use it like so from within your viewController:

let viewArray = [mySwitch, myField, mySpinner, aStepper, someView]
let constraintsDictionary = dictionaryOfBindings(viewArray)

Tested in Xcode 10.2.1 and Swift 4.2.

Many thanks to Cherpak Evgeny for writing it in the first place.