NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy";
NSDate *date = [dateFormatter dateFromString:@"2011"];
NSCalendar *calendar = [[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *oneDayAgoComponents = [[NSDateComponents alloc] init];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[oneDayAgoComponents setMonth:0];
NSUInteger numWeekdays = [calendar maximumRangeOfUnit:NSWeekdayCalendarUnit].length;
int w = numWeekdays;
for(int currentdateindexpath=0;currentdateindexpath<=12;currentdateindexpath++)
{
[formatter setDateFormat:@"MMMM yyyy"];
[oneDayAgoComponents setMonth:currentdateindexpath];
NSDate *monthAgo = [calendar dateByAddingComponents:oneDayAgoComponents
toDate:date
options:0];
NSString *montYear = [formatter stringFromDate:monthAgo];
NSDateComponents* subcomponent = [calendar components:NSWeekdayCalendarUnit
fromDate:date];
[subcomponent setWeek:currentdateindexpath];
[formatter setDateFormat:@"'week'W"];
NSString *stringFromDate = [formatter stringFromDate:monthAgo];
// Get the weekday component of the current date
[oneDayAgoComponents setDay: 0 - ([subcomponent weekday] - 1)];
NSDate *beginningOfWeek = [calendar dateByAddingComponents:oneDayAgoComponents
toDate:date options:0];
[formatter setDateFormat:@"dd/MM/yy"];
NSString *weekstartdate = [formatter stringFromDate:beginningOfWeek];
NSDateComponents *components =
[calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit |
NSDayCalendarUnit) fromDate: beginningOfWeek];
beginningOfWeek = [calendar dateFromComponents:components];
for (int d = 0; d <= w; d++)
{
NSDate *newDate1 = [beginningOfWeek dateByAddingTimeInterval:60*60*24*d];
NSLog(@"days %@",newDate1);
//+++++++++++++++++++ start week+++++++++++++++
}
[oneDayAgoComponents setDay:7 - ([subcomponent weekday])];
NSDate *endOfWeek = [calendar dateByAddingComponents:oneDayAgoComponents
toDate:date options:0];
[formatter setDateFormat:@"dd/MM/yy"];
NSString *weekendtdate = [formatter stringFromDate:endOfWeek];
NSLog(@"...>%@",[NSString stringWithFormat:@"%@ %@ to %@ %@", stringFromDate, weekstartdate, weekendtdate, montYear]);
}
如果我在2011年过年，我需要获得月，周，日列表。在相应的月份，该特定周可用的周数可用多少天以及周开始日期和结束日期需要显示...但在此代码中，仅显示第一周的每个月，我需要剩余的一周这个月...
days 2010-12-25 18:30:00 +0000
days 2010-12-26 18:30:00 +0000
days 2010-12-28 18:30:00 +0000
days 2010-12-29 18:30:00 +0000
days 2010-12-30 18:30:00 +0000
days 2010-12-31 18:30:00 +0000
days 2011-01-01 18:30:00 +0000
...>week1 26/12/10 to01/01/11 January 2011
days 2011-01-25 18:30:00 +0000
days 2011-01-26 18:30:00 +0000
days 2011-01-27 18:30:00 +0000
days 2011-01-28 18:30:00 +0000
days 2011-01-29 18:30:00 +0000
days 2011-01-30 18:30:00 +0000
days 2011-01-31 18:30:00 +0000
days 2011-02-01 18:30:00 +0000
...>week1 26/01/11 to01/02/11 February 2011
答案 0 :(得分：3)
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy";
NSDate *date = [formatter dateFromString:@"2011"];
NSCalendar *calendar = [[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
// Create the start date components
NSDateComponents *oneDayAgoComponents = [[NSDateComponents alloc] init];
[oneDayAgoComponents setMonth:0];
NSUInteger numWeekdays = [calendar maximumRangeOfUnit:NSWeekdayCalendarUnit].length;
int w=numWeekdays;
for(int currentdateindexpath=0;currentdateindexpath<=52;currentdateindexpath++)
{
[oneDayAgoComponents setWeek:currentdateindexpath];
NSDate *monthAgo = [calendar dateByAddingComponents:oneDayAgoComponents
toDate:date
options:0];
[formatter setDateFormat:@"MMMM yyyy"];
NSString *montYear = [formatter stringFromDate:monthAgo];
[formatter setDateFormat:@"'week'W"];
stringFromDate = [formatter stringFromDate:monthAgo];
NSDateComponents* subcomponent = [calendar components:NSWeekdayCalendarUnit
fromDate:date];
[oneDayAgoComponents setDay: 0 - ([subcomponent weekday] - 1)];
//NSLog(@"oneDayAgoComponents1 %@",oneDayAgoComponents);
NSDate *beginningOfWeek = [calendar dateByAddingComponents:oneDayAgoComponents
toDate:date options:0];
//NSLog(@" beginningOfWeek %@",beginningOfWeek);
[formatter setDateFormat:@"dd/MM/yy"];
NSString *weekstartdate = [formatter stringFromDate:beginningOfWeek];
// NSLog(@"weekstartdate %@",weekstartdate);
NSDateComponents *components =
[calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit |
NSDayCalendarUnit) fromDate: beginningOfWeek];
beginningOfWeek = [calendar dateFromComponents:components];
for(int d=0;d<=w;d++){
NSDate *newDate1 = [beginningOfWeek dateByAddingTimeInterval:60*60*24*d];
NSString *date_ = [formatter stringFromDate:newDate1];
NSLog(@"days %@",date_);
//NSLog(@"Show %@",beginningOfWeek);
}
[oneDayAgoComponents setDay:7- ([subcomponent weekday])];
// NSLog(@"oneDayAgoComponents2 %@",oneDayAgoComponents);
NSDate *endOfWeek = [calendar dateByAddingComponents:oneDayAgoComponents
toDate:date options:0];
// NSLog(@" endOfWeek %@",endOfWeek);
[formatter setDateFormat:@"dd/MM/yy"];
NSString *weekendtdate = [formatter stringFromDate:endOfWeek];
// NSLog(@"weekendtdate %@",weekendtdate);
NSLog(@"...>%@",[NSString stringWithFormat:@"%@ %@ to%@ %@ ",stringFromDate,weekstartdate,weekendtdate,montYear]);
}
答案 1 :(得分：1)
你可以这样做：
NSString *userYearString = @"2011";
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// Get the year from the string
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy";
NSDate *startOfTheYear = [dateFormatter dateFromString:userYearString];
// Loop until the year is over printing the data you need
//
// Some objects we'll use in the loop and that's better to instantiate only once
NSDateFormatter *weekIntervalFormatter = [[NSDateFormatter alloc] init];
weekIntervalFormatter.dateFormat = @"dd/MM/yy";
NSDateFormatter *monthFormatter = [[NSDateFormatter alloc] init];
monthFormatter.dateFormat = @"MMMM yyyy";
NSDate *currentDate = startOfTheYear;
NSTimeInterval oneDayTimeInterval = 86400;
// We'll use userYear to determing when to stop the loop
NSDateComponents *components = [calendar components:NSCalendarUnitYear fromDate:currentDate];
NSInteger userYear = [components year];
do {
// Get the month at the begin of the iteration, to use it as the stop comparator
NSInteger previousMonth = [[calendar components:NSCalendarUnitMonth fromDate:currentDate] month];
// Evaluate the month string once at the begin of the iteration
NSString *monthString = [monthFormatter stringFromDate:currentDate];
// Move a the beginning of the month
NSDate *startOfMonthDate;
NSTimeInterval _interval;
[calendar rangeOfUnit:NSMonthCalendarUnit
startDate:&startOfMonthDate
interval:&_interval
forDate:currentDate];
// From the beginning of the month move at the beginning of the week
NSDate *startOfWeekDate;
[calendar rangeOfUnit:NSWeekCalendarUnit
startDate:&startOfWeekDate
interval:&_interval
forDate:startOfMonthDate];
currentDate = startOfWeekDate;
// Loop printing the days and week information until the month is over
NSUInteger weekCounter = 1;
do {
// print a the days of the current week
NSDate *weekStartDate = currentDate;
for (int i=0; i < 7; i++) {
NSLog(@"day %@", currentDate);
currentDate = [currentDate dateByAddingTimeInterval:oneDayTimeInterval];
}
NSDate *weekEndDate = [currentDate dateByAddingTimeInterval:-oneDayTimeInterval];
// prepare the message using the date formatter previously created
NSString *formattedStartDay = [weekIntervalFormatter stringFromDate:weekStartDate];
NSString *formattedEndDay = [weekIntervalFormatter stringFromDate:weekEndDate];
NSString *message = [NSString stringWithFormat:@"...>week %d, %@ to %@\t%@", weekCounter, formattedStartDay, formattedEndDay, monthString];
NSLog(@"%@", message);
weekCounter++;
// evalutate the end of loop condition
// = is the month over?
components = [calendar components:NSCalendarUnitMonth fromDate:currentDate];
} while ([components month] == previousMonth); // loop until the month is over
// evaluate the end of loop condition
// = is the year over?
components = [calendar components:NSCalendarUnitYear fromDate:currentDate];
} while ([components year] == userYear); // loop until the year is over
此版本提供此输出
day 2010-12-26 00:00:00 +0000
day 2010-12-27 00:00:00 +0000
day 2010-12-28 00:00:00 +0000
day 2010-12-29 00:00:00 +0000
day 2010-12-30 00:00:00 +0000
day 2010-12-31 00:00:00 +0000
day 2011-01-01 00:00:00 +0000
...>week 1, 26/12/10 to 01/01/11 January 2011
day 2011-01-02 00:00:00 +0000
day 2011-01-03 00:00:00 +0000
day 2011-01-04 00:00:00 +0000
day 2011-01-05 00:00:00 +0000
day 2011-01-06 00:00:00 +0000
day 2011-01-07 00:00:00 +0000
day 2011-01-08 00:00:00 +0000
...>week 2, 02/01/11 to 08/01/11 January 2011
day 2011-01-09 00:00:00 +0000
day 2011-01-10 00:00:00 +0000
day 2011-01-11 00:00:00 +0000
day 2011-01-12 00:00:00 +0000
day 2011-01-13 00:00:00 +0000
day 2011-01-14 00:00:00 +0000
day 2011-01-15 00:00:00 +0000
...>week 3, 09/01/11 to 15/01/11 January 2011
day 2011-01-16 00:00:00 +0000
day 2011-01-17 00:00:00 +0000
day 2011-01-18 00:00:00 +0000
day 2011-01-19 00:00:00 +0000
day 2011-01-20 00:00:00 +0000
day 2011-01-21 00:00:00 +0000
day 2011-01-22 00:00:00 +0000
...>week 4, 16/01/11 to 22/01/11 January 2011
day 2011-01-23 00:00:00 +0000
day 2011-01-24 00:00:00 +0000
ay 2011-01-25 00:00:00 +0000
day 2011-01-26 00:00:00 +0000
day 2011-01-27 00:00:00 +0000
day 2011-01-28 00:00:00 +0000
day 2011-01-29 00:00:00 +0000
...>week 5, 23/01/11 to 29/01/11 January 2011
day 2011-01-30 00:00:00 +0000
day 2011-01-31 00:00:00 +0000
day 2011-02-01 00:00:00 +0000
day 2011-02-02 00:00:00 +0000
day 2011-02-03 00:00:00 +0000
day 2011-02-04 00:00:00 +0000
day 2011-02-05 00:00:00 +0000
...>week 6, 30/01/11 to 05/02/11 January 2011
day 2011-01-30 00:00:00 +0000
day 2011-01-31 00:00:00 +0000
day 2011-02-01 00:00:00 +0000
day 2011-02-02 00:00:00 +0000
day 2011-02-03 00:00:00 +0000
day 2011-02-04 00:00:00 +0000
day 2011-02-05 00:00:00 +0000
...>week 1, 30/01/11 to 05/02/11 February 2011
day 2011-02-06 00:00:00 +0000
day 2011-02-07 00:00:00 +0000
day 2011-02-08 00:00:00 +0000
day 2011-02-09 00:00:00 +0000
day 2011-02-10 00:00:00 +0000
day 2011-02-11 00:00:00 +0000
day 2011-02-12 00:00:00 +0000
...>week 2, 06/02/11 to 12/02/11 February 2011
...
正如您所看到的，我使用了与您不同的实现...我更倾向于使用do-while方法来了解月份或年份何时结束，因为它更具内省性。我也尝试尽可能少地创建对象，这总是一个好主意。
我也会向您推荐这本书：Clean Code，它包含了编写有效代码的技巧和技巧。