• 로터의 이점
  • 복잡한 뷰 계층을 쉽게 이동할 수 있게 한다.
  • 관련된 요소를 쉽게 찾을 수 있도록 한다.
• 비주얼 요소를 뽑아내고, 이를 적절히 분류하는 과정이 필요하다.

mapView.accessibilityCustomRotors = [customRotor(for: .stores), customRoter(for: .parks)]

func customRotor(for poiType: POI) -> UIAccessibilityCustomRotor {
	UIAccessibilityCustomRotor(name: poiType.rotorName) { [unowned self] predicate in
		let currentElement = predicate.currentItem.targetElement as? MKAnnotationView
		let annotations = self.annotationViews(for:. poiType)
		let currentIndex = annotations.firstIndex { $0 == currentElement }
		
		let targetIndex: Int

		switch predicate.searchDirection {
			case .previous:
				targetIndex = (currentIndex ?? 1) - 1
			case .next:
				targetIndex = (currentIndex ?? -1) + 1
		}

		guard 0..<annotations.count ~= targetIndex else { return nil }
		return UIAccessibilityCustomRotorItemResult(targetElement: annotations[targetIndex], targetRange: nil)
	}
}

func customRotor(for attribute: NSAttributedString.Key) -> UIAccessibilityCustomRotor {
	UIAccessibilityCustomRotor(name: attribute.rotorName) { [unowned self] predicate in
		var targetRange: UITextRange?
		let beginningRange = self.textRange(from: self.beginingOfDocument,
																				to: self.beginingOfDocument)
		guard let currentRange = predicate.currentItem.targetRange ?? beginningRange else { 
			return nil
		}

		let searchRange: NSRange, searchOptions: NSAttributedString.EnumeratedOptions
		
switch predicate.searchDirection {
			case .previous:
				searchRange = self.rangeOfAttributedTextBefore(currentRange)
				searchOptions = [.reverse]
			case .next:
				searchRange = self.rangeOfAttributedTextAfter(currentRange)
				searchOptions = []
		}

		self.attributedText.enumeratedAttribute(attribute, in: searchRange, options: searchOptions) 
		{ value, range, stop in
			guard value != nil else { return }
			
			targetRange = self.textRange(from: range)
			stop.pointee = true
		}

		return UIAccessibilityCustomRotorItemResult(targetElement: self, targetRange: targetRange)
	}
}