Solution for Ch 19 Platinum Challenge: Colors

iOS Programming: The Big Nerd Ranch Guide (6th Edi 19. UIGestureRecognizer and UIMenuController
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Update Line.swift. Add property color

// import Foundation
import UIKit
import CoreGraphics

struct Line {
  var begin = CGPoint.zero
  var end = CGPoint.zero
  
  var width: CGFloat = 10
  var color: UIColor = .black
}

Update touchesBegan()

// let newline = Line(begin: location, end: location, width: currentLineWidth)
let newline = Line(begin: location, end: location, width: currentLineWidth, color: currentLineColor)

Update touchesEnded()

line.color = currentLineColor
finishedLines.append(line)

Update stroke(_ line: Line)

func stroke(_ line: Line) {
  line.color.setStroke()

Update init?(coder aDecoder: NSCoder)

let swipeRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(DrawView.swipeForColors(_:)))
swipeRecognizer.numberOfTouchesRequired = 3
swipeRecognizer.direction = .up
addGestureRecognizer(swipeRecognizer)

moveRecognizer = UIPanGestureRecognizer(target: self, action: #selector(DrawView.moveLine(_:)))
moveRecognizer.delegate = self
moveRecognizer.cancelsTouchesInView = false
moveRecognizer.require(toFail: swipeRecognizer)
addGestureRecognizer(moveRecognizer)

New methods

func swipeForColors(_ gestureRecognizer: UISwipeGestureRecognizer) {
  print("Recognized a swipe")
  currentLines.removeAll()
  
  // Grab the menu controller
  let menu = UIMenuController.shared
  
  // Make DrawView the target of menu item action messages
  becomeFirstResponder()
  
  let color0Item = UIMenuItem(title: "Black", action: #selector(DrawView.selectColor0(_:)))
  let color1Item = UIMenuItem(title: "Gray", action: #selector(DrawView.selectColor1(_:)))
  let color2Item = UIMenuItem(title: "Red", action: #selector(DrawView.selectColor2(_:)))
  let color3Item = UIMenuItem(title: "Yellow", action: #selector(DrawView.selectColor3(_:)))
  let color4Item = UIMenuItem(title: "Blue", action: #selector(DrawView.selectColor4(_:)))
  menu.menuItems = [color0Item, color1Item, color2Item, color3Item, color4Item]
  
  // Tell the menu where it should come from and show it
  let targetRect = CGRect(x: self.frame.midX, y: self.frame.midY, width: 2, height: 2)
  menu.setTargetRect(targetRect, in: self)
  menu.setMenuVisible(true, animated: true)
}

func selectColor0(_ sender: UIMenuController) {
  currentLineColor = .black
  UIMenuController.shared.setMenuVisible(false, animated: true)
}

func selectColor1(_ sender: UIMenuController) {
  currentLineColor = .gray
  UIMenuController.shared.setMenuVisible(false, animated: true)
}

func selectColor2(_ sender: UIMenuController) {
  currentLineColor = .red
  UIMenuController.shared.setMenuVisible(false, animated: true)
}

func selectColor3(_ sender: UIMenuController) {
  currentLineColor = .yellow
  UIMenuController.shared.setMenuVisible(false, animated: true)
}

func selectColor4(_ sender: UIMenuController) {
  currentLineColor = .blue
  UIMenuController.shared.setMenuVisible(false, animated: true)
}