Merge pull request #25 from componentskit/Divider-UIKit

Divider UIKit

Author: VislovIvan

Examples/DemosApp/DemosApp/ComponentsPreview/PreviewPages/DividerPreview.swift

@@ -4,9 +4,14 @@ import UIKit
 
 struct DividerPreview: View {
   @State private var model = DividerVM()
-  
+
   var body: some View {
     VStack {
+      PreviewWrapper(title: "UIKit") {
+        UKComponentPreview(model: self.model) {
+          UKDivider(model: self.model)
+        }
+      }
       PreviewWrapper(title: "SwiftUI") {
         SUDivider(model: self.model)
       }

Sources/ComponentsKit/Divider/Models/DividerVM.swift

@@ -35,3 +35,12 @@ extension DividerVM {
     }
   }
 }
+
+// MARK: - UIKit Helpers
+
+extension DividerVM {
+  func shouldUpdateLayout(_ oldModel: Self) -> Bool {
+    return self.orientation != oldModel.orientation
+    || self.size != oldModel.size
+  }
+}

Sources/ComponentsKit/Divider/UKDivider.swift

@@ -0,0 +1,66 @@
+import UIKit
+
+/// A UIKit component that displays a separating line.
+open class UKDivider: UIView, UKComponent {
+  // MARK: - Properties
+
+  /// A model that defines the appearance properties.
+  public var model: DividerVM {
+    didSet {
+      self.update(oldValue)
+    }
+  }
+
+  // MARK: - UIView Properties
+
+  open override var intrinsicContentSize: CGSize {
+    return self.sizeThatFits(UIView.layoutFittingExpandedSize)
+  }
+
+  // MARK: - Initializers
+
+  /// Initializer.
+  /// - Parameters:
+  ///   - model: A model that defines the appearance properties.
+  public init(model: DividerVM = .init()) {
+    self.model = model
+    super.init(frame: .zero)
+    self.style()
+  }
+
+  public required init?(coder: NSCoder) {
+    fatalError("init(coder:) has not been implemented")
+  }
+
+  // MARK: - Setup
+
+  private func style() {
+    self.backgroundColor = self.model.color.uiColor
+    self.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
+    self.setContentCompressionResistancePriority(.defaultLow, for: .vertical)
+  }
+
+  // MARK: - Update
+
+  public func update(_ oldModel: DividerVM) {
+    guard self.model != oldModel else { return }
+
+    self.backgroundColor = self.model.color.uiColor
+
+    if self.model.shouldUpdateLayout(oldModel) {
+      self.invalidateIntrinsicContentSize()
+    }
+  }
+
+  // MARK: - UIView Methods
+
+  open override func sizeThatFits(_ size: CGSize) -> CGSize {
+    let lineSize = self.model.lineSize
+    switch self.model.orientation {
+    case .vertical:
+      return CGSize(width: lineSize, height: size.height)
+    case .horizontal:
+      return CGSize(width: size.width, height: lineSize)
+    }
+  }
+}