[iphone] 오늘, 어제, 이번 주, 지난주, 이번 달, 지난달… 변수

Question 1

나는 오늘, 어제, 이번 주, 지난주, 이번 달, 지난달 변수를 UITableView의 titleForHeaderInSection에 추가 할 헤더에 대한 비교 준비를 위해 NSDate를 얻으려고합니다.

내가 원하는 것은 2009-12-11 날짜에 대해 아래 코드에서 수동으로 수행됩니다.

 NSDate *today = [NSDate dateWithString:@"2009-12-11 00:00:00 +0000"];
 NSDate *yesterday = [NSDate dateWithString:@"2009-12-10 00:00:00 +0000"];
 NSDate *thisWeek = [NSDate dateWithString:@"2009-12-06 00:00:00 +0000"];
 NSDate *lastWeek = [NSDate dateWithString:@"2009-11-30 00:00:00 +0000"];
 NSDate *thisMonth = [NSDate dateWithString:@"2009-12-01 00:00:00 +0000"];
 NSDate *lastMonth = [NSDate dateWithString:@"2009-11-01 00:00:00 +0000"];

Question 2

날짜 및 시간 프로그래밍 가이드 에서 발췌 :

// Right now, you can remove the seconds into the day if you want
NSDate *today = [NSDate date];

// All intervals taken from Google
NSDate *yesterday = [today dateByAddingTimeInterval: -86400.0];
NSDate *thisWeek  = [today dateByAddingTimeInterval: -604800.0];
NSDate *lastWeek  = [today dateByAddingTimeInterval: -1209600.0];

// To get the correct number of seconds in each month use NSCalendar
NSDate *thisMonth = [today dateByAddingTimeInterval: -2629743.83];
NSDate *lastMonth = [today dateByAddingTimeInterval: -5259487.66];

월에 따라 정확한 정확한 날짜 수를 원하면 NSCalendar.

Question 3

이것을 작성하는 더 좋은 방법이 될 수 있지만 여기에서 Ben의 NSCalendar 제안에 대해 생각해 냈고 거기서 NSDateComponents로 작업했습니다.

NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:( NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond ) fromDate:[[NSDate alloc] init]];

[components setHour:-[components hour]];
[components setMinute:-[components minute]];
[components setSecond:-[components second]];
NSDate *today = [cal dateByAddingComponents:components toDate:[[NSDate alloc] init] options:0]; //This variable should now be pointing at a date object that is the start of today (midnight);

[components setHour:-24];
[components setMinute:0];
[components setSecond:0];
NSDate *yesterday = [cal dateByAddingComponents:components toDate: today options:0];

components = [cal components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:[[NSDate alloc] init]];

[components setDay:([components day] - ([components weekday] - 1))];
NSDate *thisWeek  = [cal dateFromComponents:components];

[components setDay:([components day] - 7)];
NSDate *lastWeek  = [cal dateFromComponents:components];

[components setDay:([components day] - ([components day] -1))];
NSDate *thisMonth = [cal dateFromComponents:components];

[components setMonth:([components month] - 1)];
NSDate *lastMonth = [cal dateFromComponents:components];

NSLog(@"today=%@",today);
NSLog(@"yesterday=%@",yesterday);
NSLog(@"thisWeek=%@",thisWeek);
NSLog(@"lastWeek=%@",lastWeek);
NSLog(@"thisMonth=%@",thisMonth);
NSLog(@"lastMonth=%@",lastMonth);

Question 4

NSDateComponents는 오늘 얻는 것이 좋습니다.

NSCalendar *cal = [NSCalendar currentCalendar];

NSDate *date = [NSDate date];
NSDateComponents *comps = [cal components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
                                                          fromDate:date];
NSDate *today = [cal dateFromComponents:comps];

이렇게하면 연도, 월, 날짜 만있는 NSDate가 생성됩니다.

(gdb) po today
2010-06-22 00:00:00 +0200

어제 등을 얻으려면 NSDateComponents를 사용하여 계산할 수 있습니다.

NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:-1];
NSDate *yesterday = [cal dateByAddingComponents:components toDate:today options:0];

Question 5

+ (NSDate*)dateFor:(enum DateType)dateType {

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *comps =
    [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
                fromDate:[NSDate date]];

    if(dateType == DateYesterday) {

        comps.day--;
    }
    else if(dateType == DateThisWeek) {

        comps.weekday = 1;
    }
    else if(dateType == DateLastWeek) {

        comps.weekday = 1;
        comps.week--;
    }
    else if(dateType == DateThisMonth) {

        comps.day = 1;
    }
    else if(dateType == DateLastMonth) {

        comps.day = 1;
        comps.month--;
    }
    else if(dateType != DateToday)
        return nil;

    return [calendar dateFromComponents:comps];
}

Question 6

스위프트 4.2

let today = Date()
let yesterday = today.addingTimeInterval(-86400.0)
let thisWeek = today.addingTimeInterval(-604800.0)
let lastWeek = today.addingTimeInterval(-1209600.0)

let thisMonth = today.addingTimeInterval(-2629743.83)
let lastMonth = today.addingTimeInterval(-5259487.66)

// components of the date
let calendar = Calendar(identifier: Calendar.Identifier.gregorian)
let components = calendar.dateComponents([.year, .month, .day], from: today)
let (year, month, day) = (components.year, components.month, components.day)

날짜 구성 요소는 선택 사항입니다.

Question 7

다른 답변은 나를 위해 작동하지 않았습니다 (아마도 내 시간대 때문일 수 있습니다). 이것이 내가하는 방법입니다.

- (BOOL)isOnThisWeek:(NSDate *)dateToCompare
{
    NSCalendar * calendar = [NSCalendar currentCalendar];
    NSDate     * today    = [NSDate date];

    int todaysWeek        = [[calendar components: NSWeekCalendarUnit fromDate:today] week];
    int dateToCompareWeek = [[calendar components: NSWeekCalendarUnit fromDate:dateToCompare] week];

    int todaysYear         = [[calendar components:NSYearCalendarUnit fromDate:today] year];
    int dateToCompareYear  = [[calendar components:NSYearCalendarUnit fromDate:dateToCompare] year];

    if (todaysWeek == dateToCompareWeek && todaysYear == dateToCompareYear) {
        return YES;
    }

    return NO;
}

Question 8

iOS 10 이상 또는 MacOS 10.12 이상을 사용하는 경우 다음 두 가지 Calendar방법을 사용하여 올바르게 수행 할 수 있습니다 .

func date(byAdding component: Calendar.Component, value: Int, to date: Date, wrappingComponents: Bool = default) -> Date?( 문서 )
func dateInterval(of component: Calendar.Component, for date: Date) -> DateInterval?( 문서 )

다음은 Swift 3에서 이러한 메서드를 사용하는 방법과 제 시간대의 놀이터 출력에 대한 예입니다.

let calendar = Calendar.current
let now = Date()
// => "Apr 28, 2017, 3:33 PM"

let yesterday = calendar.date(byAdding: .day, value: -1, to: now)
// => "Apr 29, 2017, 3:33 PM"
let yesterdayStartOfDay = calendar.startOfDay(for: yesterday!)
// => ""Apr 29, 2017, 12:00 AM"

let thisWeekInterval = calendar.dateInterval(of: .weekOfYear, for: now)
// => 2017-04-23 04:00:00 +0000 to 2017-04-30 04:00:00 +0000

let thisMonthInterval = calendar.dateInterval(of: .month, for: now)
// => 2017-04-01 04:00:00 +0000 to 2017-05-01 04:00:00 +0000

let aDateInLastWeek = calendar.date(byAdding: .weekOfYear, value: -1, to: now)
let lastWeekInterval = calendar.dateInterval(of: .weekOfYear, for: aDateInLastWeek!)
// => 2017-04-16 04:00:00 +0000 to 2017-04-23 04:00:00 +0000

let aDateInLastMonth = calendar.date(byAdding: .month, value: -1, to: now)
let lastMonthInterval = calendar.dateInterval(of: .weekOfYear, for: aDateInLastMonth!)
// => 2017-03-26 04:00:00 +0000 to 2017-04-02 04:00:00 +0000

보너스 : DateIntervals를 사용하여 날짜가 해당 범위에 속하는지 테스트 할 수 있습니다 . 위에서 계속 :

thisWeekInterval!.contains(now)
// => true
lastMonthInterval!.contains(now)
// => false