Repo created

iphone/Maps/UI/PlacePage/Views/DifficultyView.swift

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+class DifficultyView: UIView {
+  private let stackView = UIStackView()
+  private var views:[UIView] = []
+  var difficulty: ElevationDifficulty = .easy {
+    didSet {
+      updateView()
+    }
+  }
+  var colors: [UIColor] = [.gray, .green, .orange, .red]
+    {
+    didSet {
+      updateView()
+    }
+  }
+  var emptyColor: UIColor = UIColor.gray {
+    didSet {
+      updateView()
+    }
+  }
+  
+  private let bulletSize = CGSize(width: 10, height: 10)
+  private let bulletSpacing: CGFloat = 5
+  private let difficultyLevelCount = 3
+  
+  override init(frame: CGRect) {
+    super.init(frame: frame)
+    initComponent()
+  }
+  
+  required init?(coder: NSCoder) {
+    super.init(coder: coder)
+    initComponent()
+  }
+
+  private func initComponent() {
+    self.addSubview(stackView)
+    stackView.frame = bounds
+    stackView.distribution = .fillEqually
+    stackView.axis = .horizontal
+    stackView.spacing = bulletSpacing
+    stackView.alignment = .fill
+
+    for _ in 0..<difficultyLevelCount {
+      let view = UIView()
+      stackView.addArrangedSubview(view)
+      view.layer.setCornerRadius(.custom(bulletSize.height / 2))
+      views.append(view)
+    }
+  }
+  
+  private func updateView() {
+    guard colors.count > difficulty.rawValue else {
+      assertionFailure("No fill color")
+      return
+    }
+    let fillColor = colors[difficulty.rawValue]
+    for (idx, view) in views.enumerated() {
+      if idx < difficulty.rawValue {
+        view.backgroundColor = fillColor
+      } else {
+        view.backgroundColor = emptyColor
+      }
+    }
+  }
+}