Multiline SKLabelNode in Swift 3

multilinelabelnode.swift

// from https://oleb.net/blog/2016/08/swift-3-strings/
extension String {
    func wrapped(after: Int) -> [String] {
        var i = 0
        let lines = self.characters.split(omittingEmptySubsequences: false) { character in
            switch character {
            case "\n",
                 " " where i >= after:
                i = 0
                return true
            default:
                i += 1
                return false
            }
            }.map(String.init)
        return lines
    }
    }

// adapted from https://github.com/benmorrow/Multiline-SpriteKit-Label/blob/master/MultilinedSKLabelNode/SKLabelNode%2BExtensions.swift
extension SKLabelNode {
    
    func multiline(length: Int) -> SKLabelNode? {
        guard let text = text else { return nil }
        
        let substrings = text.wrapped(after: length)
        
        return substrings.enumerated().reduce(SKLabelNode()) {
            let label = SKLabelNode(fontNamed: self.fontName)
            label.text = $1.element
            label.fontColor = self.fontColor
            label.fontSize = self.fontSize
            label.position = self.position
            label.horizontalAlignmentMode = self.horizontalAlignmentMode
            label.verticalAlignmentMode = self.verticalAlignmentMode
            
            let height = self.fontSize
            let y = (height / 2) + CGFloat($1.offset - substrings.count / 2) * height
            label.position = CGPoint(x: self.position.x, y: self.position.y - y)
            $0.addChild(label)
            return $0
        }
    }
}