Easy animation library on iOS with Swift

by iOS Example

Cheetah

Cheetah is an animation utility on iOS with Swift. Cheetah can animate any properties since Cheetah uses simple CADisplayLink run loop to change animated properties.

Requirements

  • iOS 8.0~
  • tvOS 9.0~
  • Swift 3.0

Features

  • Animation with duration and delay
  • Changing with absolute/relative properties
  • Parallel/Serial executions
  • Easings
  • Springs

Carthage

Carthage is a simple, decentralized dependency manager for Cocoa.

To install Cheetah, simply add the following line to your Cartfile:

github "suguru/Cheetah"

Code Example

// Create view
let box = UIView(frame:CGRectMake(100,100,50,50))
box.backgroundColor = UIColor.blueColor()
view.addSubview(box)

// Move to 100px right
box.cheetah.move(100, 0).run()

Properties

Cheetah has several methods to animate properties easily. You can also animate your own properties with extending CheetahProperty.

  • move
  • position (absolute of move)
  • scale
  • rotate
  • rotation (absolute of rotate)
  • size
  • frame
  • alpha
  • backgroundColor
  • textColor
  • borderColor
  • borderWidth
  • borderRadius
  • custom properties

Parallel execution

Cheetah groups animation properties and execute them at once.

view.cheetah
  .move(100, 0)
  .rotate(M_PI * 2)
  .scale(1.5)
  .run()

Serial execution

wait will wait until all animations placed before it completed.
It can also receive seconds to wait to start next animation.

view.cheetah
  .move(100, 0).rotate(M_PI)
  .wait()
  .move(-100, 0).rotate(-M_PI)
  .wait(1.0) // <- wait 1 sec to start next animation
  .move(0, -20).duration(0.4)
  .wait()
  .move(0, 20).duration(0.4)
  .run()

Duration and delay

Cheetah has duration and delay to each animation properties.

view.cheetah
  .move(100, 0).duration(1.0).delay(1.0)
  .rotate(M_PI).duration(2.0)
  .wait(1)
  .move(-100, 0).duration(0.4)
  .run()

Duration will be copied from the property placed before.

view.cheetah
  .duration(0.5)
  .move(100, 0) // <- will have 0.5 sec duration
  .rotate(M_PI) // <- will have 0.5 sec duration
  .run()

Repeating

To repeat animations, use repeatCount(count: Int)

view.cheetah.rotate(M_PI_2).run().repeat(3)

To repeat forever, use forever

view.cheetah.rotate(M_PI_2).run().forever

Easings

Cheetah supports various easing functions. You can also add custom easings with quad bezier points.

Exmaple

view.cheetah.move(150, 150).easeInQuad.run()

Supported eassing equations

  • Linear
  • Sine
  • Quad
  • Quart
  • Quint
  • Circ
  • Cubic
  • Expo
  • Back
  • Bounce
  • Elastic

Springs

Cheetah supports spring dynamics with tension and friction parameters.

Example

view.cheetah
  .move(200, 0)
  .spring()
  .run()

view.cheetah
  .move(200, 0)
  .spring(tension: 100, friction: 4)
  .run()

Animate custom properties

You can extend CheetahProperty to animate custom properties. You can refer CheetahViewProperties.swift and CheetahLayerProperties.swift.

:)

GitHub

https://github.com/suguru/Cheetah