⭕ Circular Animation

Inspiration: Weather Rebound by Chris Slowik

Usage Example:

let animation = CircularAnimation()
animation.views.append(movingView)
animation.views.append(movingView2)
animation.views.append(movingView3)
animation.views.append(movingView4)
animation.views.append(movingView5)
animation.origin = CGPoint(x: 50, y: view.bounds.height / 2)
animation.radius = Float(self.view.bounds.width / 2)
animation.duration = 0.8
animation.delay = 0.1

animation.sourceAngle = 240
animation.startAngle = 60
animation.degrees = -130
animation.animatingOrder = .reversed

// Uncomment code blocks to test different variations

/*
animation.sourceAngle = 120
animation.startAngle = 290
animation.degrees = 130
animation.timingFunction = CAMediaTimingFunction(name: .easeOut)
*/

/*
animation.origin = CGPoint(x: view.bounds.width / 2, y: view.bounds.height / 2)
animation.radius = Float(self.view.bounds.width / 3 - 40)
animation.sourceAngle = 0
animation.startAngle = 0
animation.degrees = 360
animation.fullCircle = true
animation.timingFunction = CircularAnimation.TimingFunction.easeOutExpo()
*/

animation.animate(mode: .enter)

Properties:

• views: Array of views to be animated.
• radius: Virtual circle radius, which views will animate around its center.
• origin: Virtual circle center.
• sourceAngle: Angle which views start animating from, measured in degrees.
  • Valid value must lay in range [0, 360].
• startAngle: The beginning angle which views distribute themselves starting from it, measured in degrees.
  • Valid value must lay in range [0, 360].
• degrees: Amount of degrees used to distribute views within them starting from startAngle.
  • Valid value must lay in range [-360, 360].
  • Positive value will result in a clockwise animation.
  • Negative value will result in a counter-clockwise animation.
• fullCircle: Indicates whether the final shape is meant to be a full circle or not.
  • Generally, mark it as true if both first and last views overlap on each other.
• duration: Duration of animation for each view in seconds.
• delay: The delay between animating views in seconds.
• timingFunction: A timing function defining the pacing of the animation.
  • Default value is CircularAnimation.TimingFunction.easeOutQuint().
• animatingOrder: The order which views will be animated in.
  • Default value is CircularAnimation.AnimatingOrder.default.
  • Using .reversed order will result in animating the last view in views array first, then the view which precedes it, and so on.
  • Alternating between .default and .reversed will change only the order of animations execution, not their locations on screen.

Methods:

• animate: This method starts the animation, and it accepts two parameters:
  • mode: CircularAnimation.Mode: Indicates the animation mode.
    • .enter mode will animate the views starting from the source location to their final locations.
    • .exit mode will animate the views back to the source location.
    • .exit mode doesn't rely on .enter mode to be executed first.
  • options: CircularAnimation.Options?: Provide this parameter to override temporarily the current animation properties with the provided ones in options object. Its default value is nil.