Objective-C语法之NSCalendar的使用（包含NSDateComponents）

 1 #import <Foundation/Foundation.h>
 2 #import "NSDate+CalculateDay.h"
 3 
 4 int main(int argc, const char * argv[]) {
 5     @autoreleasepool {
 6         NSDate *now = [NSDate date];
 7         NSUInteger days = [now daysOfMonth];
 8         NSLog(@"本月的天数=%lu", (unsigned long)days); //本月的天数=31
 9         
10         days = [now daysOfYear];
11         NSLog(@"本年的天数=%lu", (unsigned long)days); //本年的天数=365
12         
13         NSDate *firstDay = [now firstDayOfMonth];
14         NSLog(@"firstDayOfMonth=%@", firstDay); //firstDayOfMonth=2015-10-01 11:44:24 +0000
15         
16         NSDate *lastDay = [now lastDayOfMonth];
17         NSLog(@"lastDayOfMonth=%@", lastDay); //lastDayOfMonth=2015-10-31 11:44:24 +0000
18         
19         NSDate *newDate = [lastDay addMonthAndDay:0 days:2];
20         NSLog(@"lastDayOfMonth的后天=%@", newDate); //lastDayOfMonth的后天=2015-11-02 11:44:24 +0000
21         
22         newDate = [lastDay addMonthAndDay:2 days:2];
23         NSLog(@"lastDayOfMonth的2个月零2天后时间=%@", newDate); //lastDayOfMonth的2个月零2天后时间=2016-01-02 11:44:24 +0000
24         
25         NSArray *arrMonthAndDay = [firstDay monthAndDayBetweenTwoDates:newDate];
26         NSLog(@"lastDayOfMonth的2个月零2天后时间和firstDayOfMonth相差（%@个月零%@天）", arrMonthAndDay[0], arrMonthAndDay[1]); //lastDayOfMonth的2个月零2天后时间和firstDayOfMonth相差（3个月零1天）
27     }
28     return 0;
29 }

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface NSDate (CalculateDay)
 4 /**
 5  *  获取对应月份的天数
 6  *
 7  *  @return 对应月份的天数
 8  */
 9 - (NSUInteger)daysOfMonth;
10 
11 /**
12  *  获取对应年份的天数
13  *
14  *  @return 对应年份的天数
15  */
16 - (NSUInteger)daysOfYear;
17 
18 /**
19  *  获取对应月份的第一天时间
20  *
21  *  @return 对应月份的第一天时间
22  */
23 - (NSDate *)firstDayOfMonth;
24 
25 /**
26  *  获取对应月份的最后一天时间
27  *
28  *  @return 对应月份的最后一天时间
29  */
30 - (NSDate *)lastDayOfMonth;
31 
32 /**
33  *  根据月数和天数间隔，获取间隔后的时间
34  *
35  *  @param months 月数间隔
36  *  @param days   天数间隔
37  *
38  *  @return 间隔后的时间
39  */
40 - (NSDate *)addMonthAndDay:(NSUInteger)months days:(NSUInteger)days;
41 
42 /**
43  *  根据开始时间和结束时间，获取间隔的时间数组
44  *
45  *  @param toDate 结束时间
46  *
47  *  @return 间隔的时间数组（月数和天数；toDate-fromDate的比较值是有符号整数NSInteger，所以存在负数的可能）
48  */
49 - (NSArray *)monthAndDayBetweenTwoDates:(NSDate *)toDate;
50 
51 @end

 1 #import "NSDate+CalculateDay.h"
 2 
 3 @implementation NSDate (CalculateDay)
 4 
 5 - (NSUInteger)daysOfMonth {
 6     NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
 7     NSRange range = [gregorian rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:self];
 8     return range.length;
 9 }
10 
11 - (NSUInteger)daysOfYear {
12     NSUInteger days = 0;
13     NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
14     NSDateComponents *comps = [gregorian components:NSCalendarUnitYear fromDate:self];
15     
16     for (NSUInteger i=1; i<=12; i++) {
17         [comps setMonth:i];
18         days += [[gregorian dateFromComponents:comps] daysOfMonth];
19     }
20     return days;
21 }
22 
23 - (NSDate *)firstDayOfMonth {
24     NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
25     unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
26     NSDateComponents *comps = [gregorian components:unitFlags fromDate:self];
27     [comps setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; //使用UTC或GMT解决时区相差8小时的问题
28     [comps setDay:1];
29     
30     return [gregorian dateFromComponents:comps];
31 }
32 
33 - (NSDate *)lastDayOfMonth {
34     NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
35     unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
36     NSDateComponents *comps = [gregorian components:unitFlags fromDate:self];
37     [comps setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; //使用UTC或GMT解决时区相差8小时的问题
38     [comps setDay:[self daysOfMonth]];
39     
40     return [gregorian dateFromComponents:comps];
41 }
42 
43 - (NSDate *)addMonthAndDay:(NSUInteger)months days:(NSUInteger)days {
44     NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
45     NSDateComponents *comps = [NSDateComponents new];
46     [comps setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; //使用UTC或GMT解决时区相差8小时的问题
47     [comps setMonth:months];
48     [comps setDay:days];
49     
50     return [gregorian dateByAddingComponents:comps toDate:self options:0];
51 }
52 
53 - (NSArray *)monthAndDayBetweenTwoDates:(NSDate *)toDate {
54     NSMutableArray *mArrMonthAndDay = [[NSMutableArray alloc] initWithCapacity:2];
55     NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
56     unsigned unitFlags = NSCalendarUnitMonth |  NSCalendarUnitDay;
57     NSDateComponents *comps = [gregorian components:unitFlags fromDate:self toDate:toDate options:0];
58     
59     [mArrMonthAndDay addObject:[NSString stringWithFormat:@"%ld", (long)[comps month]]];
60     [mArrMonthAndDay addObject:[NSString stringWithFormat:@"%ld", (long)[comps day]]];
61     return mArrMonthAndDay;
62 }
63 
64 @end 

1 2015-10-07 11:44:24.959 OCNSCalendar[790:42164] 本月的天数=31
2 2015-10-07 11:44:24.960 OCNSCalendar[790:42164] 本年的天数=365
3 2015-10-07 11:44:24.967 OCNSCalendar[790:42164] firstDayOfMonth=2015-10-01 11:44:24 +0000
4 2015-10-07 11:44:24.967 OCNSCalendar[790:42164] lastDayOfMonth=2015-10-31 11:44:24 +0000
5 2015-10-07 11:44:24.967 OCNSCalendar[790:42164] lastDayOfMonth的后天=2015-11-02 11:44:24 +0000
6 2015-10-07 11:44:24.967 OCNSCalendar[790:42164] lastDayOfMonth的2个月零2天后时间=2016-01-02 11:44:24 +0000
7 2015-10-07 11:44:24.968 OCNSCalendar[790:42164] lastDayOfMonth的2个月零2天后时间和firstDayOfMonth相差（3个月零1天）