カスタムローターを使ったVoiceOverの効率性

4:04 - mapView.accessibilityCustomRotors = [customRotor(for: .stores), customRotor(for: .parks)]

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

4:31 - map rotor 1

// Custom map rotors

func customRotor(for poiType: POI) -> UIAccessibilityCustomRotor {
    UIAccessibilityCustomRotor(name: poiType.rotorName) { [unowned self] predicate in

        return UIAccessibilityCustomRotorItemResult(    )
    }
}

4:56 - map rotor 2

// Custom map rotors

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 }
        return UIAccessibilityCustomRotorItemResult(    )

    }
}

5:04 - map rotor 3

// Custom map rotors

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
        }
        return UIAccessibilityCustomRotorItemResult(    )

    }
}

5:17 - Maps rotor 4

// Custom map rotors

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 } // Reached boundary
        return UIAccessibilityCustomRotorItemResult(targetElement: annotations[targetIndex],
                                                    targetRange: nil)
    }
}

8:07 - Text rotor 1

// Custom text rotor

func customRotor(for attribute: NSAttributedString.Key) -> UIAccessibilityCustomRotor {
    UIAccessibilityCustomRotor(name: attribute.rotorName) { [unowned self] predicate in
        var targetRange: UITextRange? // Goal: find the range of following `attribute`
        let beginningRange = 
        guard let currentRange =    else { return nil }

        switch predicate.searchDirection {   }

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

8:20 - Text rotor 2

// Custom text rotor

func customRotor(for attribute: NSAttributedString.Key) -> UIAccessibilityCustomRotor {
    UIAccessibilityCustomRotor(name: attribute.rotorName) { [unowned self] predicate in
        var targetRange: UITextRange? // Goal: find the range of following `attribute`
        let beginningRange = self.textRange(from: self.beginningOfDocument,
                                            to: self.beginningOfDocument)
        guard let currentRange = predicate.currentItem.targetRange ?? beginningRange else {
            return nil
        }
        let searchRange: NSRange, searchOptions: NSAttributedString.EnumerationOptions
        switch predicate.searchDirection {   }

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

8:37 - Text rotor 3

// Custom text rotor

func customRotor(for attribute: NSAttributedString.Key) -> UIAccessibilityCustomRotor {
    UIAccessibilityCustomRotor(name: attribute.rotorName) { [unowned self] predicate in
        var targetRange: UITextRange? // Goal: find the range of following `attribute`
        let beginningRange = 
        guard let currentRange =    else { return nil }
        let searchRange: NSRange, searchOptions: NSAttributedString.EnumerationOptions
        switch predicate.searchDirection {
        case .previous:
            searchRange = self.rangeOfAttributedTextBefore(currentRange)
            searchOptions = [.reverse]
        case .next:
            searchRange = self.rangeOfAttributedTextAfter(currentRange)
            searchOptions = []
        }
       
        return UIAccessibilityCustomRotorItemResult(targetElement: self,
                                                    targetRange: targetRange)
    }
}

9:06 - Text rotor 4 (end)

// Custom text rotor

func customRotor(for attribute: NSAttributedString.Key) -> UIAccessibilityCustomRotor {
    UIAccessibilityCustomRotor(name: attribute.rotorName) { [unowned self] predicate in
        var targetRange: UITextRange? // Goal: find the range of following `attribute`
        let beginningRange =
        guard let currentRange =    else { return nil }
        let searchRange: NSRange, searchOptions: NSAttributedString.EnumerationOptions
        switch predicate.searchDirection {   }
        self.attributedText.enumerateAttribute(
            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)
    }
}