Ios 如何获取日期IO数组中的所有星期日

我只想要一个数组，它以NSDate的形式包含一年中所有的星期一，但要使用swift。 我在objective-c中使用以下代码，但不知道如何在swift中使用它

 NSDate *pickerDate = [NSDate date];
    NSLog(@"pickerDate: %@", pickerDate);

    NSDateComponents *dateComponents;
    NSCalendar *calendar = [NSCalendar currentCalendar];

    dateComponents = [calendar components:NSWeekdayCalendarUnit fromDate:pickerDate];
    NSInteger firstMondayOrdinal = 9 - [dateComponents weekday];
    dateComponents = [[NSDateComponents alloc] init];
    [dateComponents setDay:firstMondayOrdinal];
    NSDate *firstMondayDate = [calendar dateByAddingComponents:dateComponents toDate:pickerDate options:0];

    dateComponents = [[NSDateComponents alloc] init];
    [dateComponents setWeek:1];

    for (int i=0; i<64; i++) {
        [dateComponents setWeek:i];
        NSDate *mondayDate = [calendar dateByAddingComponents:dateComponents toDate:firstMondayDate options:0];
        NSLog(@"week#: %i, mondayDate: %@", i, mondayDate);
    }

NSDate*pickerDate=[NSDate-date]；
NSLog（@“pickerDate:%@”，pickerDate）；
NSDateComponents*dateComponents；
NSCalendar*日历=[NSCalendar currentCalendar]；
dateComponents=[calendar components:NSWeekdayCalendarUnit fromDate:pickerDate]；
NSInteger firstMondayOrdinal=9-[dateComponents weekday]；
dateComponents=[[NSDateComponents alloc]init]；
[dateComponents setDay:firstMondayOrdinal]；
NSDate*firstMondayDate=[calendar Date ByAddingComponents:dateComponents toDate:pickerDate选项：0]；
dateComponents=[[NSDateComponents alloc]init]；
[dateComponents setWeek:1]；
对于（int i=0；i给你

var pickerDate = NSDate()
println(pickerDate)

var dateComponents: NSDateComponents? = nil
var calendar = NSCalendar.currentCalendar()

dateComponents = calendar.components(NSCalendarUnit.CalendarUnitWeekday, fromDate: pickerDate)
var firstMondayOrdinal = 9 - dateComponents!.weekday
dateComponents =  NSDateComponents()
dateComponents!.day = firstMondayOrdinal
var firstMondayDate = calendar.dateByAddingComponents(dateComponents!, toDate: pickerDate, options: NSCalendarOptions(0))

dateComponents = NSDateComponents()
dateComponents?.weekdayOrdinal = 1

for (var i=0; i<64; i++){
    dateComponents?.weekdayOrdinal = i
    var mondayDate = calendar.dateByAddingComponents(dateComponents!, toDate: firstMondayDate!, options: NSCalendarOptions.MatchFirst)
     println("\(i)" + "\(mondayDate!)");
}

var pickerDate=NSDate（）
println（pickerDate）
变量dateComponents:NSDateComponents？=nil
var calendar=NSCalendar.currentCalendar（）
dateComponents=calendar.components（NSCalendarUnit.CalendarUnitWeekday，fromDate:pickerDate）
var firstMondayOrdinal=9-dateComponents！.weekday
dateComponents=NSDateComponents（）
dateComponents！.day=firstMondayOrdinal
var firstMondayDate=calendar.dateByAddingComponents（dateComponents！，toDate:pickerDate，options:NSCalendarOptions（0））
dateComponents=NSDateComponents（）
dateComponents？.weekdayOrdinal=1
对于（var i=0；i给你。这很简单，但也有一些问题，特别是
NSCalendarOptions
的选项集，
dateByAddingComponents
返回一个可选项，
NSCalendarUnit
的枚举名称更改和
NSDateComponents.week
的弃用，但除此之外，它是很简单。我还没有检查逻辑

//NSDate *pickerDate = [NSDate date];
let pickerDate = NSDate() /* I just used today for playground */

//NSLog(@"pickerDate: %@", pickerDate);
print("pickerDate: \(pickerDate)")

//NSDateComponents *dateComponents;
var dateComponents: NSDateComponents /* var because you keep reallocating it */

//NSCalendar *calendar = [NSCalendar currentCalendar];
let calendar = NSCalendar.currentCalendar()

//dateComponents = [calendar components:NSWeekdayCalendarUnit fromDate:pickerDate];
dateComponents = calendar.components(NSCalendarUnit.Weekday, fromDate: pickerDate)

//NSInteger firstMondayOrdinal = 9 - [dateComponents weekday];
let firstMondayOrdinal = 9 - dateComponents.weekday

//dateComponents = [[NSDateComponents alloc] init];
dateComponents = NSDateComponents()

//[dateComponents setDay:firstMondayOrdinal];
dateComponents.day = firstMondayOrdinal

//NSDate *firstMondayDate = [calendar dateByAddingComponents:dateComponents toDate:pickerDate options:0];
if let firstMondayDate = calendar.dateByAddingComponents(dateComponents, toDate: pickerDate, options: NSCalendarOptions(rawValue: 0)) {
    /* this returns an optional so test for it */

    //dateComponents = [[NSDateComponents alloc] init];
    dateComponents = NSDateComponents()

    //[dateComponents setWeek:1]; /* week deprecated */
    dateComponents.weekOfYear = 1 /* this line is redundant, re-done inside for */

    //for (int i=0; i<64; i++) {
    for i in 0 ..< 64 {
        //[dateComponents setWeek:i];
        dateComponents.weekOfYear = i
        //    NSDate *mondayDate = [calendar dateByAddingComponents:dateComponents toDate:firstMondayDate options:0];
        let mondayDate = calendar.dateByAddingComponents(dateComponents, toDate: firstMondayDate, options: NSCalendarOptions(rawValue: 0))
        /* no need to test for nil if just printing it, but beware */

        //NSLog(@"week#: %i, mondayDate: %@", i, mondayDate);
        print("week#: \(i), mondayDate: \(mondayDate)")
    }
}

//NSDate*pickerDate=[NSDate-date]；
让pickerDate=NSDate（）/*我今天刚在操场上用过*/
//NSLog（@“pickerDate:%@”，pickerDate）；
打印（“pickerDate:\（pickerDate）”）
//NSDateComponents*dateComponents；
var dateComponents:NSDateComponents/*var，因为您一直在重新分配它*/
//NSCalendar*日历=[NSCalendar currentCalendar]；
让calendar=NSCalendar.currentCalendar（）
//dateComponents=[calendar components:NSWeekdayCalendarUnit fromDate:pickerDate]；
dateComponents=calendar.components（NSCalendarUnit.Weekday，fromDate:pickerDate）
//NSInteger firstMondayOrdinal=9-[dateComponents weekday]；
让firstMondayOrdinal=9-dateComponents.weekday
//dateComponents=[[NSDateComponents alloc]init]；
dateComponents=NSDateComponents（）
//[dateComponents setDay:firstMondayOrdinal]；
dateComponents.day=firstMondayOrdinal
//NSDate*firstMondayDate=[calendar Date ByAddingComponents:dateComponents toDate:pickerDate选项：0]；
如果让firstMondayDate=calendar.dateByAddingComponents（dateComponents，toDate:pickerDate，options:NSCalendarOptions（rawValue:0））{
/*这将为其返回可选的so测试*/
//dateComponents=[[NSDateComponents alloc]init]；
dateComponents=NSDateComponents（）
//[dateComponents setWeek:1]；/*周已弃用*/
dateComponents.weekOfYear=1/*此行是多余的，请在内部为重新执行*/
//对于（int i=0；iXcode 8或更高版本•Swift 3或更高版本

extension Calendar {
    static let gregorian = Calendar(identifier: .gregorian)
}


有一种被低估但非常方便的方法
枚举日期（开始于：匹配：匹配策略：）
的
日历

// Create the date component matching the weekday (Sunday = 1)
let mondayComponent = DateComponents(weekday: 2)

// Calculate Jan 1st of the current date
let calendar = Calendar.current
let currentDate = Date()
var startOfYear = currentDate
var interval : TimeInterval = 0.0
_ = calendar.dateInterval(of:.year, start: &startOfYear, interval: &interval, for: currentDate)

// Get the current year as integer
let thisYear = calendar.component(.year, from: startOfYear)

// Create an array for the result
var allMondays = [Date]()

// If Jan 1st is a Monday append it to the array
if calendar.component(.weekday, from: startOfYear) == 2 { allMondays.append(startOfYear) }

// Now enumerate all dates matching the weekday component within this year
// If the year reaches thisYear + 1 the block will be exited.    
calendar.enumerateDates(startingAfter: startOfYear, matching: mondayComponent, matchingPolicy: .nextTime) { (date, strict, stop) in
    guard let date = date else { return }
    if calendar.component(.year, from: date) > thisYear {
        stop = true
    } else {
        allMondays.append(date)
    }
}

在这里，我只是定制了上述代码，以获得不同的星期日数

这是您约会的下个星期日的延长时间

这段代码中有哪一部分您在翻译时遇到问题？是的，我只想转换这段代码，这样我就可以在一个数组中获得所有的星期天。然后，请接受我的答案：）（勾选显示在所提供答案左上角的复选标记）
let today = Date()
let nextFollowingSundays = today.nextFollowingSundays(52)
nextFollowingSundays.forEach { sunday in
    print(sunday.description(with: .current), terminator: "\n")
}
// ["Feb 17, 2019 at 12:00 AM", "Feb 24, 2019 at 12:00 AM", "Mar 3, 2019 at 12:00 AM", "Mar 10, 2019 at 12:00 AM", "Mar 17, 2019 at 12:00 AM", "Mar 24, 2019 at 12:00 AM", "Mar 31, 2019 at 12:00 AM", "Apr 7, 2019 at 12:00 AM", "Apr 14, 2019 at 12:00 AM", "Apr 21, 2019 at 12:00 AM", "Apr 28, 2019 at 12:00 AM", "May 5, 2019 at 12:00 AM", "May 12, 2019 at 12:00 AM", "May 19, 2019 at 12:00 AM", "May 26, 2019 at 12:00 AM", "Jun 2, 2019 at 12:00 AM", "Jun 9, 2019 at 12:00 AM", "Jun 16, 2019 at 12:00 AM", "Jun 23, 2019 at 12:00 AM", "Jun 30, 2019 at 12:00 AM", "Jul 7, 2019 at 12:00 AM", "Jul 14, 2019 at 12:00 AM", "Jul 21, 2019 at 12:00 AM", "Jul 28, 2019 at 12:00 AM", "Aug 4, 2019 at 12:00 AM", "Aug 11, 2019 at 12:00 AM", "Aug 18, 2019 at 12:00 AM", "Aug 25, 2019 at 12:00 AM", "Sep 1, 2019 at 12:00 AM", "Sep 8, 2019 at 12:00 AM", "Sep 15, 2019 at 12:00 AM", "Sep 22, 2019 at 12:00 AM", "Sep 29, 2019 at 12:00 AM", "Oct 6, 2019 at 12:00 AM", "Oct 13, 2019 at 12:00 AM", "Oct 20, 2019 at 12:00 AM", "Oct 27, 2019 at 12:00 AM", "Nov 3, 2019 at 1:00 AM", "Nov 10, 2019 at 1:00 AM", "Nov 17, 2019 at 12:00 AM", "Nov 24, 2019 at 12:00 AM", "Dec 1, 2019 at 12:00 AM", "Dec 8, 2019 at 12:00 AM", "Dec 15, 2019 at 12:00 AM", "Dec 22, 2019 at 12:00 AM", "Dec 29, 2019 at 12:00 AM", "Jan 5, 2020 at 12:00 AM", "Jan 12, 2020 at 12:00 AM", "Jan 19, 2020 at 12:00 AM", "Jan 26, 2020 at 12:00 AM", "Feb 2, 2020 at 12:00 AM", "Feb 9, 2020 at 12:00 AM", "Feb 16, 2020 at 12:00 AM"]

// Create the date component matching the weekday (Sunday = 1)
let mondayComponent = DateComponents(weekday: 2)

// Calculate Jan 1st of the current date
let calendar = Calendar.current
let currentDate = Date()
var startOfYear = currentDate
var interval : TimeInterval = 0.0
_ = calendar.dateInterval(of:.year, start: &startOfYear, interval: &interval, for: currentDate)

// Get the current year as integer
let thisYear = calendar.component(.year, from: startOfYear)

// Create an array for the result
var allMondays = [Date]()

// If Jan 1st is a Monday append it to the array
if calendar.component(.weekday, from: startOfYear) == 2 { allMondays.append(startOfYear) }

// Now enumerate all dates matching the weekday component within this year
// If the year reaches thisYear + 1 the block will be exited.    
calendar.enumerateDates(startingAfter: startOfYear, matching: mondayComponent, matchingPolicy: .nextTime) { (date, strict, stop) in
    guard let date = date else { return }
    if calendar.component(.year, from: date) > thisYear {
        stop = true
    } else {
        allMondays.append(date)
    }
}

 extension Calendar {
            static let gregorian = Calendar(identifier: .gregorian)
        }

        extension Date {
            var startOfWeek: Date {
                return Calendar.gregorian.date(from: Calendar.gregorian.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self))!
            }
            var nextSunday: Date {
                return Calendar.gregorian.date(byAdding: DateComponents(weekOfYear: 1), to: startOfWeek)!
            }
        }


//Write this logic in your custom function

 @objc func getNext100Sundsays(){
        let firstSunday = date?.nextSunday
        var result = [firstSunday]
        var displayResult = [String]()
        (1...1000).forEach  { _ in
            guard let nextSunday = result.last??.nextSunday else { return }
            let stringDispayDate = displayDateFormatter.string(from: nextSunday)
            result.append(nextSunday)
            displayResult.append(stringDispayDate)
        }
    }