GlobalFunctionsAndExtensions.swift
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//
// GlobalFunctionsAndExtensions.swift
//
// Copyright (c) 2016-2017 JTAppleCalendar (https://github.com/patchthecode/JTAppleCalendar)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
extension Calendar {
static let formatter: DateFormatter = {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy MM dd"
dateFormatter.isLenient = true
return dateFormatter
}()
func startOfMonth(for date: Date) -> Date? {
guard let comp = dateFormatterComponents(from: date) else { return nil }
return Calendar.formatter.date(from: "\(comp.year) \(comp.month) 01")
}
func endOfMonth(for date: Date) -> Date? {
guard
let comp = dateFormatterComponents(from: date),
let day = self.range(of: .day, in: .month, for: date)?.count,
let retVal = Calendar.formatter.date(from: "\(comp.year) \(comp.month) \(day)") else {
return nil
}
return retVal
}
private func dateFormatterComponents(from date: Date) -> (month: Int, year: Int)? {
// Setup the dateformatter to this instance's settings
Calendar.formatter.timeZone = self.timeZone
Calendar.formatter.locale = self.locale
Calendar.formatter.calendar = self
let comp = self.dateComponents([.year, .month], from: date)
guard
let month = comp.month,
let year = comp.year else {
return nil
}
return (month, year)
}
}
extension Dictionary where Value: Equatable {
func key(for value: Value) -> Key? {
guard let index = index(where: { $0.1 == value }) else {
return nil
}
return self[index].0
}
}