**Ease** is an event driven animation system that combines the observer pattern with custom spring animations as observers. **It's magic.**
## Features
- [X] Animate any value type
- [X] Set multiple animations for a single value
- [X] Animation trajectories update when you update the `targetValue`
- [X] Add natural spring behavior to any value change
- [X] Optimized for Swift 5
- [X] Compatible with iOS 9 and up
## Supported value types
- CGFloat
- CGPoint
- CGSize
- CGVector
- Int
- Float
- Double
- SCNVector3
Easily extendible with more (custom) types.
## Examples
- SceneKit Example👆
- UIKit Examples
## How
Create your **Ease** object with an initial value
```swift
var ease: Ease = Ease(view.center, minimumStep: 0.001)
```
Add your custom spring-animation(s)
```swift
ease.addSpring(tension: 300, damping: 15, mass: 1) { position in
view.center = position
}
```
Set the target value of your Ease object and adjust your target as often as you want
```swift
ease.targetValue = gestureRecognizer.location(in: view)
```
## Memory management
For a single spring-animation you can store the returned `EaseDisposable` to a variable
```swift
disposable = ease.addSpring(tension...
```
For multiple spring-animations you can add the disposable to a `EaseDisposal` variable
```swift
ease.addSpring(tension...) { }.add(to: &disposal)
```
And always weakify `self` when referencing `self` inside your spring-animation
```swift
ease.addSpring(tension...) { [weak self] position in
```
## Installation
Ease is available through [CocoaPods](http://cocoapods.org). To install
it, simply add the following line to your Podfile:
```ruby
pod 'Ease'
```
## Suggestions or feedback?
Feel free to create a pull request, open an issue or find [me on Twitter](https://twitter.com/roberthein).