Fix previous commit affecting implicit animations on CALayer.

Summary: Also remove the temporary code in ArcMove that was disabling actions.

Reviewers: O2 Material Motion, O4 Material Apple platform reviewers, #material_motion, chuga

Reviewed By: O4 Material Apple platform reviewers, chuga

Tags: #material_motion

Differential Revision: http://codereview.cc/D2798

examples/ArcMoveExample.swift

@@ -47,13 +47,7 @@ public class ArcMoveExampleViewController: UIViewController {
     draggable.targetView = targetView
     runtime.add(draggable, to: targetView)
 
-    // Note: this is a temporary solution to prevent implicit animations
-    let tapLayerPositionWrapper = ReactiveProperty(initialValue: tapCircleLayer.position, externalWrite: { position in
-      CATransaction.setDisableActions(true)
-      reactiveTapLayer.position.value = position
-      CATransaction.setDisableActions(false)
-    }, coreAnimation: {_ in })
-    runtime.add(Tap(), to: tapLayerPositionWrapper)
+    runtime.add(Tap(), to: reactiveTapLayer.position)
 
     let arcMove = ArcMove(duration: 0.4,
                           from: reactiveTapLayer.position,

src/reactivetypes/ReactiveCALayer.swift

@@ -117,7 +117,7 @@ public class ReactiveCALayer {
     var lastAnimationKey: String?
     let property = ReactiveProperty(name, initialValue: initialValue, externalWrite: { value in
       let actionsWereDisabled = CATransaction.disableActions()
-      CATransaction.setDisableActions(false)
+      CATransaction.setDisableActions(true)
       externalWrite(value)
       CATransaction.setDisableActions(actionsWereDisabled)
     }, coreAnimation: { [weak self] event in