ReactiveCocoa
Cocoa framework and Obj-C dynamism bindings for ReactiveSwift
...ReactiveSwift offers composable, declarative and flexible primitives that are built around the grand concept of streams of values over time. These primitives can be used to uniformly represent common Cocoa and generic programming patterns that are fundamentally an act of observation. ReactiveCocoa wraps various aspects of Cocoa frameworks with the declarative ReactiveSwift primitives. Interactive UI components expose Signals for control events and updates in the control value upon user interactions. Create signals that are sourced by intercepting Objective-C objects, e.g. method call interception and object deinitialization.