Animated RxCocoa bindings
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RxAnimated - animated bindings

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RxAnimated provides animation interface to RxCocoa's bindings.

It comes with few predefined animation bindings, and provides a flexible mechanism for you to add your own predefined animations and use them when binding with RxCocoa.


Built-in animations

When binding values with RxCocoa you write something like:

  .bind(to: labelFlip.rx.text)

This updates the label's text each time the observable emits a new string value. But this happens abruptly and without any transition. With RxAnimated you can use the animated extension to bind values with animations, like so:

  .bind(animated: labelFlip.rx.animated.flip(.top, duration: 0.33).text)

The "difference" is that you use bind(animated:) instead of bind(to:) and you insert animated.flip(.top, duration: 0.33) (or one of the other provided or custom animation methods) between rx and the property sink you want to use, e.g. text in the example above.

The same built-in fade and flip animations work on any UIView element. And also on specific properties like UILabel.rx.text or UIImageView.rx.image.

Animation List

List of built-in animated sinks:


List of the built-in animations:

UIView.rx.animated.fade(duration: TimeInterval)
UIView.rx.animated.flip(FlipDirection, duration: TimeInterval)
UIView.rx.animated.tick(FlipDirection, duration: TimeInterval)
UIView.rx.animated.animation(duration: TimeInterval, animations: ()->Void)
NSLayoutConstraint.rx.animated.layout(duration: TimeInterval)

Check the demo app for a number of examples.

Custom animations

You can easily add your custom bind animations to match the visual style of your app.

I. (Optional) If you are animating a new binding sink that has no animated binding (e.g. UIImageView.rx.image, UILabel.rx.text and more are already included but you need another property)

// This is your class `UILabel`
extension AnimatedSink where Base: UILabel { 
    // This is your property name `text` and value type `String`
    public var text: Binder<String> { 
        let animation = self.type!
        return Binder(self.base) { label, text in
            animation.animate(view: label, block: {
                guard let label = label as? UILabel else { return }
                // Here you update the property
                label.text = text 

II. Add your new animation method:

// This is your class `UIView`
extension AnimatedSink where Base: UIView { 
    // This is your animation name `tick`
    public func tick(_ direction: FlipDirection = .right, duration: TimeInterval) -> AnimatedSink<Base> { 
        // use one of the animation types and provide `setup` and `animation` blocks
        let type = AnimationType<Base>(type: RxAnimationType.spring(damping: 0.33, velocity: 0), duration: duration, setup: { view in
            view.alpha = 0
            view.transform = CGAffineTransform(rotationAngle: direction == .right ?  -0.3 : 0.3)
        }, animations: { view in
            view.alpha = 1
            view.transform = CGAffineTransform.identity
        //return AnimatedSink
        return AnimatedSink<Base>(base: self.base, type: type) 

III. Now you can use your new animation to bind subscriptions. Here's how usually binding UIImageView.rx.image looks like:

    .bind(to: imageView.rx.image)

And the result is non-animated binding:

If you use your new custom animation binding like so:

    .bind(to: imageView.rx.animated.tick(.right, duration: 0.33).image)

The effect will be:

And if you use the same animation on a UILabel:

    .bind(to: labelCustom.rx.animated.tick(.left, duration: 0.75).text)

The sky is the limit! (And good taste.)


The demo app shows few animations in action, download the repo and give it a try.


RxAnimated depends on RxSwift 4+.

RxAnimated is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "RxAnimated"


RxAnimated is available under the MIT license. See the LICENSE file for more info.