public final class CalendarView: UIView {     }   } +  public override func layoutMarginsDidChange() {+    setNeedsLayout()

 Features: - A day selection handler to monitor when a day is tapped - Customizable layout metrics - Pinning days of the week to the top-- Showing partial boundary months (exactly 2020-03-14 to 2020-04-20, for example)-- Scrolling to arbitrary dates and months, with or without animation+- Show partial boundary months (exactly 2020-03-14 to 2020-04-20, for example)

 final class VisibleItemsProvider {     }   } +  private func correctedScrollToItemFrameForContentBoundaries(

 extension MonthsLayout: Equatable {    public static func == (lhs: MonthsLayout, rhs: MonthsLayout) -> Bool {     switch (lhs, rhs)  {+    case (.vertical(let lhsOptions), .vertical(let rhsOptions)): return lhsOptions == rhsOptions     case (.horizontal, .horizontal): return true-    case (.vertical(let l), .vertical(let r)): return l == r     default: return false     }   }  }++// MARK: - VerticalMonthsLayoutOptions++/// Layout options for a vertically-scrolling calendar.+public struct VerticalMonthsLayoutOptions: Equatable {

+// Created by Bryan Keller on 6/23/20.+// Copyright © 2020 Airbnb Inc. All rights reserved.++import HorizonCalendar+import UIKit++// MARK: - PartialMonthVisibilityDemoViewController++final class PartialMonthVisibilityDemoViewController: UIViewController, DemoViewController {++  // MARK: Lifecycle++  init(monthsLayout: MonthsLayout) {+    self.monthsLayout = monthsLayout+    super.init(nibName: nil, bundle: nil)+  }++  required init?(coder: NSCoder) {+    fatalError("init(coder:) has not been implemented")+  }++  // MARK: Internal++  override func viewDidLoad() {+    super.viewDidLoad()++    title = "Partial Month Visibility for Vertical Months Layout"++    if #available(iOS 13.0, *) {+      view.backgroundColor = .systemBackground+    } else {+      view.backgroundColor = .white+    }++    calendarView.daySelectionHandler = { [weak self] day in+      guard let self = self else { return }++      self.selectedDay = day+      self.calendarView.setContent(self.makeContent())+    }+    view.addSubview(calendarView)++    calendarView.translatesAutoresizingMaskIntoConstraints = false+    switch monthsLayout {+    case .vertical:+      NSLayoutConstraint.activate([+        calendarView.topAnchor.constraint(equalTo: view.layoutMarginsGuide.topAnchor),+        calendarView.bottomAnchor.constraint(equalTo: view.layoutMarginsGuide.bottomAnchor),+        calendarView.leadingAnchor.constraint(+          greaterThanOrEqualTo: view.layoutMarginsGuide.leadingAnchor),+        calendarView.trailingAnchor.constraint(+          lessThanOrEqualTo: view.layoutMarginsGuide.trailingAnchor),+        calendarView.centerXAnchor.constraint(equalTo: view.centerXAnchor),+        calendarView.widthAnchor.constraint(lessThanOrEqualToConstant: 375)+      ])+    case .horizontal(let monthWidth):+      NSLayoutConstraint.activate([