The skip-motion framework is available at https://github.com/skiptools/skip-motion.git, which can be checked out and tested with skip test once Skip is installed.

SkipMotion

• Status
• Size
• Example
• Building
• Testing
• License

This is a Skip Swift/Kotlin library project that provides the ability to play Lottie animations in dual-platform Skip apps for iOS and Android.

On the Kotlin side, SkipMotion uses the lottie-ios package, and on Android it uses the lottie-android.

Lottie is a mobile library for Android and iOS that parses Adobe After Effects animations exported as json with Bodymovin and renders them natively, enabling designers and developers to create and ship beautiful and seamless animations in their apps.

Example:

import SwiftUI
import Foundation
import SkipMotion

struct ContentView: View {
    var body: some View {
        VStack(alignment: .center) {
            Text("Skip Motion Animation")
                .font(.largeTitle)
            MotionView(lottie: lottieData)
        }
    }
}

let lottieData = """
{"mn":"ADBE Vector Shape - Group"}
""".data(using: String.Encoding.utf8)!

Status

SkipMotion is in a very early stage, and lack any playback controls or other customization of the animations.

You are encouraged to contribute to the project or file an issue with needs and requests.

Size

Adding SkipMotion as a dependency will add around 1MB to the size of the release .ipa and .apk artifacts for your project.

Example

See the LottieDemo project for an example of using SkipMotion in a Skip App project.

Building

This project is a Swift Package Manager module that uses the Skip plugin to transpile Swift into Kotlin.

Building the module requires that Skip be installed using Homebrew with brew install skiptools/skip/skip. This will also install the necessary build prerequisites: Kotlin, Gradle, and the Android build tools.

Testing

The module can be tested using the standard swift test command or by running the test target for the macOS destination in Xcode, which will run the Swift tests as well as the transpiled Kotlin JUnit tests in the Robolectric Android simulation environment.

Parity testing can be performed with skip test, which will output a table of the test results for both platforms.

License

This software is licensed under the GNU Lesser General Public License v3.0, with the following linking exception to clarify that distribution to restricted environments (e.g., app stores) is permitted:

This software is licensed under the LGPL3, included below. As a special exception to the GNU Lesser General Public License version 3 (“LGPL3”), the copyright holders of this Library give you permission to convey to a third party a Combined Work that links statically or dynamically to this Library without providing any Minimal Corresponding Source or Minimal Application Code as set out in 4d or providing the installation information set out in section 4e, provided that you comply with the other provisions of LGPL3 and provided that you meet, for the Application the terms and conditions of the license(s) which apply to the Application. Except as stated in this special exception, the provisions of LGPL3 will continue to comply in full to this Library. If you modify this Library, you may apply this exception to your version of this Library, but you are not obliged to do so. If you do not wish to do so, delete this exception statement from your version. This exception does not (and cannot) modify any license terms which apply to the Application, with which you must still comply.