Question

我想要工作日的日期=包含原始日期的星期五

我曾尝试使用以下编码，但它不起作用： -

Nsdate currDate;(currDate can be date)
int dayofweek; // Detect the day of week
NSString *Start_date = @"13/nov/2014";
                    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
                    [formatter setDateFormat:@"yyyy-MM-dd"];
                    NSString *stringFromDate = [formatter stringFromDate:currDate];
 NSCalendar* cal = [NSCalendar currentCalendar];
NSDateComponents* comp = [cal components:NSWeekdayCalendarUnit fromDate:Startdate]; dayofweek=[comp weekday];

 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
                            [dateFormatter setDateFormat:@"yyyy-MM-dd"];
 NSDate *Startdate = [[NSDate alloc] init];
Startdate = [dateFormatter dateFromString:Start_date];
NSDate *fetchdate=[self firstDayOfWeekFromDate:Startdate];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd"];
NSString *stringFromDate1 = [formatter stringFromDate:fetchdate];
NSString *trimmedString=[stringFromDate1 substringFromIndex:MAX((int)[stringFromDate1 length]-2, 0)];
NSString *trimmedString1=[stringFromDate substringFromIndex:MAX((int)[stringFromDate1 length]-2, 0)];
if([trimmedString1 isEqualToString:trimmedString]){
     NSlog(@"YES IT IS DAY OF WEEK");
}


//***************************function

- (NSDate *)firstDayOfWeekFromDate:(NSDate *)date {
    NSCalendar* calendar = [NSCalendar currentCalendar];
    NSDateComponents* comps = [calendar components:NSYearForWeekOfYearCalendarUnit |NSYearCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSWeekdayCalendarUnit fromDate:date];
    [comps setWeekday:dayofweek]; // 2: monday
    return [calendar dateFromComponents:comps];
}

Answer 1

将其细分为步骤。绝对没有理由在一个功能中完成所有工作。

我假设你明年要和周五一样。（从您删除的上一个问题开始）

首先，您需要在一年的时间内获得相同的日期。

- (NSDate *)dateOneYearFromDate:(NSDate *)date
{
    NSDateComponents *components = [NSDateComponents new];
    components.year = 1;

    NSCalendar *calendar = [NSCalendar currentCalendar];

    return [calendar dateByAddingComponents:components toDate:date options:0];
}

然后你需要弄清楚那天是哪一天......

- (NSInteger)dayOfWeekFromDate:(NSDate *)date
{
    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *components = [calendar components:NSWeekdayCalendarUnit fromDate:date];

    return components.weekday;
}

然后你需要找那个星期五的星期五......

- (NSDate *)fridayFromWeekOfDate:(NSDate *)date
{
    NSInteger friday = 6;
    NSInteger dayOfWeekFromDate = [self dayOfWeekFromDate:date];

    NSInteger difference = friday - dayOfWeekFromDate;

    NSDateComponents *components = [NSDateComponents new];
    components.day = difference;

    NSCalendar *calendar = [NSCalendar currentCalendar];

    return [calendar dateByAddingComponents:components toDate:date options:0];
}

让每一步都迈出一小步......

现在你可以这样做......

- (void)someFunction
{
    NSDate *someFriday = // this is your original date...

    NSDate *oneYearLater = [self dateOneYearFromDate:someFriday];

    NSDate *fridayOneYearFromNow = [self fridayFromWeekOfDate:oneYearLater];
}

Answer 2

以下代码应该让您开始......（编码盲/未测试）

NSDate * currentDate = [NSDate date];

CFAbsoluteTime at = CFAbsoluteTimeGetCurrent();
CFTimeZoneRef tz = CFTimeZoneCopySystem();
SInt32 WeekdayNumber = CFAbsoluteTimeGetDayOfWeek(at, tz);
int currentDayOfTheWeek = (int)WeekdayNumber;
if(currentDayOfTheWeek == 5) {
    //Its Friday!
    return currentDate;
} else {
    return [currentDate dateByAddingTimeInterval:((60 * 60 * 24) * (5 - currentDayOfTheWeek)]; 
}

包含原始日期的一周的工作日日期

2 个答案: