Tap specification
This is the engineering specification for the Tap interaction.
Overview
The tap interaction writes to a position property when a tap gesture is recognized.
Example use:
let tap = Tap(sets: tossable.destination, containerView: view)
MVP
Expose a Tap type
public class Tap: Interaction
Expose configurable values
All property values should be readonly, all stream values should be settable.
class Tap {
/** The position to which the position stream is expected to write. */
public let position: ReactiveProperty<CGPoint>
/** A stream that emits positional values to be written to the view. */
public var positionStream: MotionObservable<CGPoint>
Expose an initializer
class Tap {
public init(sets position: ReactiveProperty<CGPoint>,
containerView: UIView,
tapGestureRecognizer: UITapGestureRecognizer? = nil)
Store the position
class Tap {
init(...) {
self.position = position
...
Create a tap gesture recognizer if one was not provided
class Tap {
init(...) {
...
let tapGestureRecognizer = tapGestureRecognizer ?? UITapGestureRecognizer()
if tapGestureRecognizer.view == nil {
containerView.addGestureRecognizer(tapGestureRecognizer)
}
...
Create the position stream
class Tap {
init(...) {
...
self.positionStream = gestureSource(tapGestureRecognizer)
.onRecognitionState(.recognized)
.centroid(in: containerView)