Popsicle - 简单的、可扩展的插值框架

Popsicle - 简单的、可扩展的插值框架

THIS PROJECT IS NO LONGER MAINTAINED.

Popsicle is a Swift framework for creating and managing interpolations of different value types with built-in UIKit support.

Installation

Carthage

github "DavdRoman/Popsicle"

CocoaPods

pod 'Popsicle'

Manual

Drag and copy all files in the Popsicle folder into your project.

At a glance

Interpolating UIView (or any other NSObject) values

First, you need an Interpolator instance:

let interpolator = Interpolator()

Next, you need to add some Interpolation instances to your interpolator. In the example below, we are going to interpolate the alpha value of a UIView for times between 0 and 150:

let interpolation = Interpolation(yourView, alpha)interpolation[0] = 0interpolation[150] = 1self.interpolator.addInterpolation(interpolation)

Note alpha is a built-in KeyPath constant. Popsicle offers a nice set of UIKit-related KeyPaths ready to be used. You may also use a completely custom key path.

You can also modify the easing function used at a given time:

interpolation.setEasingFunction(EasingFunctionEaseOutQuad, forTime: 0)

There's a bunch of built-in easing functions to choose from.

Finally, just make your interpolator vary its time depending on whatever you want. For example, the content offset of a UITableView:

func scrollViewDidScroll(scrollView: UIScrollView) { interpolator.time = Double(scrollView.contentOffset.y)}

Interpolating custom values

You can declare a value type as interpolable by making it conform to the Interpolable protocol.

As an example, check out how CGPoint conforms to Interpolable:

extension CGSize: Interpolable { public static func interpolate(from fromValue: CGSize, to toValue: CGSize, withProgress progress: Progress) -> CGSize { let width = CGFloat.interpolate(from: fromValue.width, to: toValue.width, withProgress: progress) let height = CGFloat.interpolate(from: fromValue.height, to: toValue.height, withProgress: progress) return CGSizeMake(width, height) } public static func objectify(value: CGSize) -> AnyObject { return NSValue(CGSize: value) }}

License

Popsicle is available under the MIT license.

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