有办法检查 NSDate 是本周还是下周？
我知道今天是：
[NSDate date]
然后我该怎么办？
问问题
3660 次
7 回答
6
使用 NSDateComponents，如下所示：
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *today = [NSDate date];
NSDateComponents *todaysComponents =
[gregorian components:NSWeekCalendarUnit fromDate:date];
NSUInteger todaysWeek = [todaysComponents week];
NSDate *anotherDate = [NSDate date];
NSDateComponents *otherComponents =
[gregorian components:NSWeekCalendarUnit fromDate:anotherDate];
NSUInteger anotherWeek = [otherComponents week];
if(todaysWeek==anotherWeek){
NSLog(@"another date is this week");
}else if(todaysWeek+1==anotherWeek){
NSLog(@"another date is next week")
}
您还可以使用其他组件（例如月份或年份）来完全确定。
注意：不要使用时间间隔。通过使用 NSDateComponents，您可以忽略小时、分钟和秒。我想你想要那个。
于 2012-04-13T15:45:03.613 回答
2
将 2 个日期传递给此方法：
- (BOOL) isSameWeekAsDate: (NSDate *) aDate andDate:(NSDate *) bDate
{
NSDateComponents *components1 = [[NSCalendar currentCalendar] components:(NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit) fromDate:aDate];
NSDateComponents *components2 = [[NSCalendar currentCalendar] components:(NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit) fromDate:bDate];
if ([components1 week] != [components2 week]) return NO;
//return (abs([self timeIntervalSinceDate:aDate]) < 604800); // ops, forgot to change "self" with parameter "bDate":
return (abs([bDate timeIntervalSinceDate:aDate]) < 604800);
}
编辑： 用 2 个不同年份的日期调用它：
[components setDay:31];
[components setMonth:12];
[components setYear:2010];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date1 = [gregorian dateFromComponents:components];
// second date (SATURDAY -of the same week, other year...)
[components setDay:1];
[components setMonth:1];
[components setYear:2011];
NSDate *date2 = [gregorian dateFromComponents:components];
if ([self isSameWeekAsDate:date1 andDate:date2]) {
NSLog(@"Same Week!");
}else{
NSLog(@"OTHER WEEK!");
}
于 2012-04-13T15:40:44.713 回答
1
我正在添加我的解决方案（实现为NSDate 类别），它不使用周，在 iOS7、iOS8 中已弃用
- (NSDate *)firstDateOfWeek {
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *startOfWeek;
[calendar rangeOfUnit:NSCalendarUnitWeekOfYear startDate:&startOfWeek interval:NULL forDate:self];
return startOfWeek;
}
- (BOOL)isSameWeekWithDate:(NSDate *)date {
if (ABS(self.timeIntervalSince1970 - date.timeIntervalSince1970) > (7 * 24 * 60 * 60)) {
return NO;
}
return ([[self firstDateOfWeek] timeIntervalSince1970] == [[date firstDateOfWeek] timeIntervalSince1970]);
}
- (BOOL)isThisWeek {
return [self isSameWeekWithDate:[NSDate new]];
}
于 2014-09-23T12:53:17.677 回答
0
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:NSWeekCalendarUnit fromDate:yourDate];
NSInteger week = [components week]; // here your have a Integer with the weeknr of yourDate
components = [cal components:NSWeekCalendarUnit fromDate:[NSDate date]];
weekToday = [components week]; // here your have a Integer with the weeknr of today
其余的你应该能够做到。当谈到一年中的最后一周时，它可能会再做一次脑力劳动。
清除？
于 2012-04-13T15:36:17.877 回答
0
注意：这使用周日-周六周的概念来计算“周”的概念。
要计算一周中的当前日期，请从此处使用以下命令：
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *weekdayComponents =[gregorian components:NSWeekdayCalendarUnit fromDate:dateOfInterest];
NSInteger weekday = [weekdayComponents weekday];
// weekday 1 = Sunday for Gregorian calendar
[gregorian release];
其余的应该是微不足道的。从您的 NSDate 获取当前日期和日期。使用日期和日期查找开始和结束日期（如果今天是星期一，那么date - 1 day是一周的第一天等）。找出日期在哪一周。
于 2012-04-13T15:36:54.120 回答
0
对于 iOS 7 及更高版本，您必须替换NSWeekCalendarUnit为NSCalendarUnitWeekOfYear
- (NSInteger)thisW:(NSDate *)date
{
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *todaysComponents = [gregorian components:NSCalendarUnitWeekOfYear fromDate:[NSDate date]];
NSUInteger todaysWeek = [todaysComponents weekOfYear];
NSDateComponents *otherComponents = [gregorian components:NSCalendarUnitWeekOfYear fromDate:date];
NSUInteger datesWeek = [otherComponents weekOfYear];
//NSLog(@"Date %@",date);
if(todaysWeek==datesWeek){
//NSLog(@"Date is in this week");
return 1;
}else if(todaysWeek+1==datesWeek){
//NSLog(@"Date is in next week");
return 2;
} else {
return 0;
}
}
于 2016-08-17T02:18:25.473 回答
0
忘记日期组件，您必须调整很多东西（检查它是否是一年中的最后一周，检查星期日是否是一周的开始......）并且容易出现错误和意大利面条代码。
这解决了您的问题，并扩展到检测“上周”、“前几周”、“本周”、“下周”和“后周”
-(EventWeekRange)numberOfWeeksFromTodayToEvent:(NSDate *)eventDate {
NSCalendar *calendar = [NSCalendar currentCalendar];
NSComparisonResult comparison = [calendar compareDate:[NSDate date] toDate:eventDate toUnitGranularity:NSCalendarUnitWeekOfYear];
if (comparison == NSOrderedSame) {
return RangeThisWeek;
} else if (comparison == NSOrderedAscending) { // The event date is in the future
// Advance today's date one week to check if this new date is in the same week as the event
NSDate *todaysNextWeek = [[NSDate date]dateByAddingTimeInterval:60*60*24*7];
if ([calendar compareDate:todaysNextWeek toDate:eventDate toUnitGranularity:NSCalendarUnitWeekOfYear] == NSOrderedSame) {
return RangeNextWeek;
} else {
return RangeLater;
}
} else { // The event date is in the past
// Advance the event's date one week to check if this new date is in the same week as today
NSDate *eventsNextWeek = [eventDate dateByAddingTimeInterval:60*60*24*7];
if ([calendar compareDate:eventsNextWeek toDate:[NSDate date] toUnitGranularity:NSCalendarUnitWeekOfYear] == NSOrderedSame) {
return RangeLastWeek;
} else {
return RangeEarlier;
}
}
}
于 2017-09-28T15:29:33.593 回答