iOS Calendar Week/Day View in Swift

Inspired from WRCalendarView

• X-Day per Page (Day view: 1-day, 3-day view, weekview: 7-day)
• Two Scroll types: One-Day scroll (scroll a section) or Page scroll
• Two Types of Long Press Gestures: Add a new event & Move an existing event
• Events display on calendar view (supports events with conflict time and events crossing few days)
• Set horizontal scrollable range dates
• Support all device orientations (including iPhone X Landscape) and iPad (Slide Over and Split View)
• Customise your own current timeline
• All-Day Events

In your viewController, you only need do few things.

1. Setup your own custom calendarWeekView in viewDidLoad

calendarWeekView.setupCalendar(numOfDays: 7,
                               setDate: Date(),
                               allEvents: JZWeekViewHelper.getIntraEventsByDate(originalEvents: events),
                               scrollType: .pageScroll,
                               firstDayOfWeek: .Monday)

2. Override viewWillTransition and call viewTransitionHandler in JZWeekViewHelper to support all device orientations

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    JZWeekViewHelper.viewTransitionHandler(to: size, weekView: calendarWeekView)
}

3. Setup your own custom flowLayout style in viewDidLoad (optional)

calendarWeekView.updateFlowLayout(JZWeekViewFlowLayout(hourHeight: 50, rowHeaderWidth: 50, columnHeaderHeight: 50, hourGridDivision: JZHourGridDivision.noneDiv))

Create your own WeekView class inheriting from JZBaseWeekView, and you should override the following functions.

1. Register function: Register your own UICollectionReusableView here. (CollectionViewCell, SupplementaryView or DecorationView)

override func registerViewClasses() {
    super.registerViewClasses()

    // Register CollectionViewCell
    self.collectionView.register(UINib(nibName: "EventCell", bundle: nil), forCellWithReuseIdentifier: "EventCell")

    // Register DecorationView: must provide corresponding JZDecorationViewKinds
    self.flowLayout.register(BlackGridLine.self, forDecorationViewOfKind: JZDecorationViewKinds.verticalGridline)
    self.flowLayout.register(BlackGridLine.self, forDecorationViewOfKind: JZDecorationViewKinds.horizontalGridline)

    // Register SupplementrayView: must override collectionView viewForSupplementaryElementOfKind
    collectionView.register(RowHeader.self, forSupplementaryViewOfKind: JZSupplementaryViewKinds.rowHeader, withReuseIdentifier: "RowHeader")
}

If you want to use your own supplementryView (including your current timeline), you should register it and override the following function

override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView

2. CollectionView cellForItemAt: Use your custom collectionViewCell

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let date = flowLayout.dateForColumnHeader(at: indexPath)
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: EventCell.className, for: indexPath) as! EventCell
    cell.updateView(event: allEventsBySection[date]![indexPath.row] as! Event)
    return cell
}

This view is inheriated from JZBaseWeekView and implements the long press gestures. You can simply follow the setup rules of JZBaseWeekView.
In order to achieve the long press gestures, you should implement the JZLongPressViewDelegate and JZLongPressViewDataSource in your ViewController.

public protocol JZLongPressViewDelegate: class {
    /// When addNew long press gesture ends, this function will be called.
    func weekView(_ weekView: JZLongPressWeekView, didEndAddNewLongPressAt startDate: Date)
    /// When Move long press gesture ends, this function will be called.
    func weekView(_ weekView: JZLongPressWeekView, editingEvent: JZBaseEvent, didEndMoveLongPressAt startDate: Date)
    /// Sometimes the longPress will be cancelled because some curtain reason.
    func weekView(_ weekView: JZLongPressWeekView, longPressType: JZLongPressWeekView.LongPressType, didCancelLongPressAt startDate: Date)
}

public protocol JZLongPressViewDataSource: class {
    /// Implement this function to customise your own AddNew longPressView
    func weekView(_ weekView: JZLongPressWeekView, viewForAddNewLongPressAt startDate: Date) -> UIView
    /// Implement this function to customise your own Move longPressView
    func weekView(_ weekView: JZLongPressWeekView, movingCell: UICollectionViewCell, viewForMoveLongPressAt startDate: Date) -> UIView
}

Also, you should provide the long press types and there are some other properties you can change.

calendarWeekView.longPressDelegate = self
calendarWeekView.longPressDataSource = self
calendarWeekView.longPressTypes = [.addNew, .move]

// Optional
calendarWeekView.addNewDurationMins = 120
calendarWeekView.moveTimeMinInterval = 15

If you want to use the move type long press, you have to inherit your UICollectionViewCell from JZLongPressEventCell to allow retrieving editing JZBaseEvent because of UICollectionView reuse problem. Also, remember to set your cell backgroundColor in cell contentView.

In JZCalendarWeekView, the data model is using [Date: [Event]] dictionary because for each day (a section in collectionView), there might be some events.

A static function called getIntraEventsByDate provided in JZWeekViewHelper allow you to tranform your events list into [Date: [Event]] dictionary.

open class func getIntraEventsByDate<T: JZBaseEvent>(originalEvents: [T]) -> [Date: [T]]

In order to call this function, you should create a subclass of JZBaseEvent and also implement the NSCopying protocol.
For the intraStartDate and intraEndDate in JZBaseEvent, it means that if a event crosses two days, it should be divided into two events but with different intraStartDate and intraEndDate.
eg. startDate = 180329 14:00, endDate = 180330 03:00, then two events should be generated: 1. 180329 14:00(IntraStart) - 23:59(IntraEnd) 2. 180330 00:00(IntraStart) - 03:00(IntraEnd)

All-Day feature is aimed to display all-day events separately, but only events tagged isAllDay true can be shown. For those events crossing few days would better keep them isAllDay false. (Refer to Apple Calendar & Google Calendar)
In order to active all-day feature, there are only two things you need to do.

1. Inherit your Event class from JZAllDayEvent to ensure the isAllDay variable added.
2. In your customised CalendarViewWeekView, override the viewForSupplementaryElementOfKind and use updateView in AllDayHeader to update your all-day view with your own views. Example

Horizontal scrollable range dates allow you to set your preferred scrollable range. CalendarWeekView can only be horizontal scrollable between startDate(including) and endDate(including). nil means no limit.

1. You can set scrollableRange when you call setupCalendar() or simply change this variable.
2. If you change scrollType without calling forceReload(), you should call setHorizontalEdgesOffsetX() to reset the edges, because for different scroll types, the edges are different.

• iOS 9.0+
• Xcode 10+
• Swift 4.2

JZCalendarWeekView can be added to your project by adding the following dependency to your Package.swift:

.package(url: "https://github.com/zjfjack/JZCalendarWeekView.git", .upToNextMajor(from: "0.7.2"))

JZCalendarWeekView can be added to your project by adding the following line to your Podfile:

# Latest release in CocoaPods (recommend to use latest version before v1.0.0 release, optional: provide version number)
pod 'JZCalendarWeekView'

JZCalendarWeekView can be added to your project by adding the following line to your Cartfile:

# Latest release on Carthage (recommend to use latest version before v1.0.0 release, optional: provide version number)
github "zjfjack/JZCalendarWeekView"

• DecorationView for different background views (refer to #12)
• Limited date range: start time and end Time (vertical) in CalendarView
• Theme implementation
• New scroll type: Infinite scroll
• Support different types of event arrangment rules

Jeff Zhang, zekejeff@gmail.com
If you have any questions and suggestions, feel free to contact me.

JZCalendarWeekView is available under the MIT license. See the LICENSE for more info.