如何在Swift中将当前一周的第一天设置为星期二? [英] How to set the first day of current week to Tuesday in Swift?

问题描述

如何在Swift 3中将当前一周的第一天设置为星期二?时间表将在每个星期二更新，因此第一天必须从星期二开始.

How to set the first day of current week to Tuesday in Swift 3? The schedule will update every Tuesday so the first day have to start from Tuesday.

，然后显示在标签上:

thisWeekDate.text! = "\(first day of current week) - \(last day of current week)"

完整代码.

let today = NSDate()
    let nextTue = Calendar.current.date(byAdding: .day, value: 6, to: today as Date)
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyy-MM-dd"
    let todayString = formatter.string(from: today as Date)
    let nextString = formatter.string(from: nextTue!)
    formatter.dateFormat = "dd-MMM-yyyy"

    let calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)
    let components = calendar!.components([.weekday], from: today as Date)

    //Label code
    thisWeekDate.text! = "\(first day of current week) - \(last day of current week)"

    //If i can change the first day of current week this weekly update code can be deleted
    if components.weekday == 3 { 
        print("Hello Tuesday")
        thisWeekDate.text! = "\(todayString) - \(nextString)"

        UserDefaults.standard.set(todayString, forKey: "todayStringKey")
        _ = UserDefaults.standard.object(forKey: "todayStringKey") as? String
        UserDefaults.standard.set(nextString, forKey: "nextStringKey")
        _ = UserDefaults.standard.object(forKey: "nextStringKey") as? String

    } else {
        print("It's not Tuesday")
        let RetrivedDate_1 = UserDefaults.standard.object(forKey: "todayStringKey") as? String
        let RetrivedDate_2 = UserDefaults.standard.object(forKey: "nextStringKey") as? String

        if let date_1 = RetrivedDate_1, let date_2 = RetrivedDate_2 {
            thisWeekDate.text! = "\(date_1) - \(date_2)"
        }


    }

应用程序设计屏幕截图

推荐答案

创建自定义公历并将第一个工作日设置为星期二

Create a custom Gregorian calendar and set the first weekday to Tuesday

var customCalendar = Calendar(identifier: .gregorian)
customCalendar.firstWeekday = 3

然后您可以使用

var startDate = Date()
var interval = TimeInterval()
customCalendar.dateInterval(of: .weekOfMonth, start: &startDate, interval: &interval, for: Date())
let endDate = startDate.addingTimeInterval(interval - 1)
print(startDate, endDate)

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