TransitionController specification
This is the engineering specification for the TransitionController
object.
Overview
TransitionController
is a bridge between the platform’s transitioning architecture and a TransitionDirector
.
MVP
Concrete type: A TransitionController
is a concrete type.
Example pseudo-code:
TransitionController {
}
One transition controller per view controller: Every view controller stores its own weakly-created TransitionController
instance.
directorClass API: Provide an API for storing a TransitionDirector
type.
The type must represent an object that conforms to the TransitionDirector
type.
Example pseudo-code:
TransitionController {
public var directorClass: TransitionDirector.type
Transition will start: The following should occur when a transition is about to begin:
- Initialize the director
- Invoke the
setUp
event on the director - Commit the
setUp
transaction to a runtime
Example pseudo-code:
TransitionController {
function transitionWillStart(initialDirection) {
let runtime = MotionRuntime()
runtime.delegate = self
let transition = Transition(...)
director = directorClass(transition)
}
}
Finish on idle: Finish the transition when the runtime enters the idle activity state.
Open Questions
- How do we handle directors that never enter the .Active state?