Previous RAC to dim

gistfile1.swift

let exerciseTransitioningSignal = exerciseTransitioningSubject
	.startWithBoxedValue(false)
	.takeUntil(rac_willDeallocSignal())
controlsEnabledSubscription = exerciseTransitioningSignal
	.combineLatestWith(isReachableSignal)
	.map {
		let tuple = $0 as! RACTuple
		let isExerciseTransitioning = (tuple.first as! Box<Bool>).value
		let isReachable = (tuple.second as! Box<Bool>).value

		let enabled = !isExerciseTransitioning && isReachable
		return Box(enabled)
	}
	.distinctUntilBoxedValueChanged(Bool.self)
	.subscribeNext { [weak self] in
		let enabled = ($0 as! Box<Bool>).value

		self!.setButtonsEnabled(enabled)
	}