BasicTween

Example: Fade in

Transition Fade {
  func setUp() {
    runtime.addPlan(
      BasicTween(
        .opacity, 
        from: 0, 
        to: 1, 
        withTimingFunction: .easeInOut, 
        duration: 300, 
        delay: 0,
      ), 
      to: target
    )
  }
}

Contract

Linearly interpolate a target's property from one value to another using a timing function for velocity.

Plan BasicTween {
  var property
  var from
  var to
  var timingFunction
  var duration
  var delay
}

property is any animatable value on the target object.

from is a value whose types matches that of the property.

to is a value whose types matches that of the property.

timingFunction is a cubic-bezier timing function.

duration is the length of time over which the animation should occur, expressed in milliseconds (e.g. 300 milliseconds).

delay is the number of milliseconds that should elapse before a tween begins.

For platforms that support a model/presentation layer separation, the from and to values can be optional. Consider the following situations:

• Both from and to are provided. Interpolates between from and to.

• Only from is provided. Interpolates between from and the current presentation value of the property.

• Only to is provided. Interpolates between the current value of the property and to.