在ios SDK中获取当月星期一的所有日期 [英] Get all the date of the monday of current month in ios sdk

问题描述

如何在ios sdk中获取当月所有星期一的所有日期?

How to get all the date of all the monday in current month in ios sdk?

例如，我希望所有星期一的日期都在2015年1月

For example i want date of all the monday occur in January-2015

下面的代码从nsdate给我月份，日期和年份.但是现在我想要该月的工作日(星期一)的日期.

Below code give me month,day and year from nsdate. But now i want nsdate of weekday(Monday) in that month.

NSDate *currentDate = [NSDate date];
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:currentDate]; // Get necessary date components

 [components month]; //gives you month
 [components day]; //gives you day
 [components year]; // gives you year

推荐答案

//Set Wantedday here with sun=1 ..... sat=7;
NSInteger wantedWeekDay = 2; //for monday

//set current date here
NSDate *currentDate = [NSDate date];

//get calender
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

// Start out by getting just the year, month and day components of the current date.
NSDateComponents *components = [gregorianCalendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSCalendarUnitWeekday fromDate:currentDate];
// Change the Day component to 1 (for the first day of the month), and zero out the time components.
[components setDay:1];

[components setHour:0];
[components setMinute:0];
[components setSecond:0];

//get first day of current month
NSDate *firstDateOfCurMonth = [gregorianCalendar dateFromComponents:components];

//create new component to get weekday of first date
NSDateComponents *newcomponents = [gregorianCalendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSCalendarUnitWeekday fromDate:firstDateOfCurMonth];
NSInteger firstDateWeekDay = newcomponents.weekday;
NSLog(@"weekday : %li",(long)firstDateWeekDay);

//get last month date
NSInteger curMonth = newcomponents.month;
[newcomponents setMonth:curMonth+1];

NSDate * templastDateOfCurMonth = [[gregorianCalendar dateFromComponents:newcomponents] dateByAddingTimeInterval: -1]; // One second before the start of next month

NSDateComponents *lastcomponents = [gregorianCalendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSCalendarUnitWeekday fromDate:templastDateOfCurMonth];

[lastcomponents setHour:0];
[lastcomponents setMinute:0];
[lastcomponents setSecond:0];

NSDate *lastDateOfCurMonth = [gregorianCalendar dateFromComponents:lastcomponents];

NSLog(@"%@",lastDateOfCurMonth);

NSMutableArray *mutArrDates = [NSMutableArray array];

NSDateComponents *dayDifference = [NSDateComponents new];
[dayDifference setCalendar:gregorianCalendar];

//get wanted weekday date
NSDate *firstWeekDateOfCurMonth = nil;
if (wantedWeekDay == firstDateWeekDay) {
    firstWeekDateOfCurMonth = firstDateOfCurMonth;
}
else
{
    NSInteger day = wantedWeekDay - firstDateWeekDay;
    if (day < 0)
        day += 7;
    ++day;
    [components setDay:day];

    firstWeekDateOfCurMonth = [gregorianCalendar dateFromComponents:components];
}

NSLog(@"%@",firstWeekDateOfCurMonth);

NSUInteger weekOffset = 0;
NSDate *nextDate = firstWeekDateOfCurMonth;

do {
    [mutArrDates addObject:nextDate];
    [dayDifference setWeekOfYear:++weekOffset];
    NSDate *date = [gregorianCalendar dateByAddingComponents:dayDifference toDate:firstWeekDateOfCurMonth options:0];
    nextDate = date;
} while([nextDate compare:lastDateOfCurMonth] == NSOrderedAscending || [nextDate compare:lastDateOfCurMonth] == NSOrderedSame);

NSLog(@"%@",mutArrDates);

这篇关于在ios SDK中获取当月星期一的所有日期的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！