A calendar based heatmap which presenting a time series of data points in colors

pod 'CalendarHeatmap'

github "Zacharysp/CalendarHeatmap"

// minimum usage.
let startDate = Date()
// the first day of calendar is the first date from the month of provided start date.
let calendarHeatmap = CalendarHeatmap(startDate: startDate)
calendarHeatmap.delegate = self
view.addSubview(calendarHeatmap)

// provide a range of date.
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
let startDate = formatter.date(from: "2019-10-18")
let endDate = formatter.date(from: "2020-02-14")
// default endDate is now.
let calendarHeatmap = CalendarHeatmap(startDate: startDate, endDate: endDate)

// you could custom the heatmap by using CalendarHeatmapConfig.
let calendarHeatmap = CalendarHeatmap(config: config, startDate: Date())
let config = CalendarHeatmapConfig()

func colorFor(dateComponents: DateComponents) -> UIColor {
    guard let year = dateComponents.year,
        let month = dateComponents.month,
        let day = dateComponents.day else { return .clear}
    // manage your color based on date here
    let yourColor = {...}
    return yourColor
}