NSCalendar 日历

   /**1.  System Locale Information 取得当前用户的逻辑日历(logical calendar) 两种类方法**/// 1.1 取得当前用户的逻辑日历// currentCalendar取得的值会一直保持在cache中,第一次取得以后如果用户修改该系统日历设定，这个值也不会改变。NSCalendar *currentcalender = [NSCalendar currentCalendar];NSLog(@"currentcalender = %@",currentcalender.calendarIdentifier);// currentcalender = gregorian// 1.2 取得当前用户的逻辑日历// 用autoupdatingCurrentCalendar，那么每次取得的值都会是当前系统设置的日历的值。NSCalendar *calendar2 = [NSCalendar autoupdatingCurrentCalendar];NSLog(@"calendar2 = %@",calendar2.calendarIdentifier);  // calendar2 = gregorian/** 2.Initializing a Calendar2.1 - (id)initWithCalendarIdentifier:(NSString *)identifier;初始化为各种日历。identifier的范围可以是:NSGregorianCalendar 阳历NSBuddhistCalendar 佛历NSChineseCalendar 中国日历NSHebrewCalendar 希伯来日历NSIslamicCalendar 伊斯兰日历NSIslamicCivilCalendar 伊斯兰民事日历NSJapaneseCalendar 日本日历*/NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];NSCalendar *calendar3 = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierJapanese];NSLog(@"calendar3 = %@",calendar3.calendarIdentifier); // calendar3 = japaneseNSCalendar *calendar4 = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierChinese];NSLog(@"calendar4 = %@",calendar4.calendarIdentifier);  // calendar4 = chinese/*2.2 - (void)setFirstWeekday:(NSUInteger)value;设定每周的第一天从星期几开始，比如:.  如需设定从星期日开始，则value传入1.  如需设定从星期一开始，则value传入2.  以此类推详细信息请参阅FirstWeekday属性*/[calendar setFirstWeekday:2];/*2.3 - (void)setLocale:(NSLocale *)locale;  设置区域*/[calendar setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];/*2.4 - (void)setMinimumDaysInFirstWeek:(NSUInteger)mdw  *///设定作为(每年及每月)第一周必须包含的最少天数，比如:.  如需设定第一周最少包括7天，则value传入7[calendar setMinimumDaysInFirstWeek:7];/*2.5 - (void)setTimeZone:(NSTimeZone *)tz  *///设置时区[calendar setTimeZone:[NSTimeZone defaultTimeZone]];/**3.   Getting Information About a Calendar*//*3.1 - (NSString *)calendarIdentifier 返回日历标示符 */NSString *canlendarIdentifier = calendar.calendarIdentifier;NSLog(@"canlendarIdentifier = %@",canlendarIdentifier);  //canlendarIdentifier = gregorian/*3.2 - (NSUInteger)firstWeekday  返回日历指定的每周的第一天从星期几开始。缺省为星期天，即firstWeekday = 1*/NSUInteger firstWeekday = [calendar firstWeekday];NSLog(@"firstWeekday = %d",firstWeekday);  // firstWeekday = 2/*3.3 - (NSLocale *)locale 返回日历指定的地区信息*/NSLocale *locale = [calendar locale];NSLog(@"localeIdentifier = %@",locale.localeIdentifier);   // localeIdentifier = en_US/*3.4 //- (NSRange)maximumRangeOfUnit:(NSCalendarUnit)unit    //返回单元的最大范围//- (NSRange)minimumRangeOfUnit:(NSCalendarUnit)unit    //返回单元的最小范围 //比如Day Calendar Unit就是一个月最多31天这个意思Calendar UnitsSpecify calendrical units such as day and month.enum {NSEraCalendarUnit = kCFCalendarUnitEra,NSYearCalendarUnit = kCFCalendarUnitYear,NSMonthCalendarUnit = kCFCalendarUnitMonth,NSDayCalendarUnit = kCFCalendarUnitDay,NSHourCalendarUnit = kCFCalendarUnitHour,NSMinuteCalendarUnit = kCFCalendarUnitMinute,NSSecondCalendarUnit = kCFCalendarUnitSecond,NSWeekCalendarUnit = kCFCalendarUnitWeek,NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,NSQuarterCalendarUnit = kCFCalendarUnitQuarter,NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYearNSCalendarCalendarUnit = (1 << 20),NSTimeZoneCalendarUnit = (1 << 21),};typedef NSUInteger NSCalendarUnit;*/// 月Day的最大范围NSRange maxRangeDay = [calendar maximumRangeOfUnit:NSCalendarUnitDay];NSLog(@"maxRangeDay = %@",NSStringFromRange(maxRangeDay));  // maxRangeDay = {1, 31}// 月Day的最小范围NSRange minRangeDay = [calendar minimumRangeOfUnit:NSCalendarUnitDay];NSLog(@"minRangeDay = %@",NSStringFromRange(minRangeDay));  // minRangeDay = {1, 28}// 每年的月的最大范围NSRange maxRangeMonth = [calendar maximumRangeOfUnit:NSCalendarUnitMonth];NSLog(@"maxRangeMonth = %@",NSStringFromRange(maxRangeMonth));  // maxRangeMonth = {1, 12}// 每个月周的最小范围NSRange minRangeWeekOfMonth = [calendar minimumRangeOfUnit:NSCalendarUnitWeekOfMonth];NSLog(@"minRangeWeekOfMonth = %@",NSStringFromRange(minRangeWeekOfMonth));    //minRangeWeekOfMonth = {1, 4}/* 3.5 - (NSUInteger)minimumDaysInFirstWeek 返回日历指定的第一周必须包含的最少天数。*/NSUInteger minimumDays = [calendar minimumDaysInFirstWeek];NSLog(@"minimumDays = %d",minimumDays);      // minimumDays = 7/* 3.6 - (NSUInteger)ordinalityOfUnit:(NSCalendarUnit)smaller inUnit:(NSCalendarUnit)larger forDate:(NSDate *)date*///在一个给定的时间，小日历单元如（一天）在大日历单元（一周）中的序数。//比如forDate参数是星期一，而且firstWeekday 参数被设置为2（也就是星期一为一周的第一天）,那么返回为1//通过这个函数可以判断 例如 ：给定的日期是在一周的第几天，或一月的第几周。一年的第几个月。一年的第几天等//注:firstWeekday的设定会影响这个函数的返回值int ordinality = [calendar ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitMonth forDate:[NSDate date]];NSLog(@"ordinality = %@",[NSString stringWithFormat:@"%d",ordinality ]);  // ordinality = 1/*3.7 - (NSRange)rangeOfUnit:(NSCalendarUnit)smaller inUnit:(NSCalendarUnit)larger forDate:(NSDate *)date */// 一个小日历单元下。大日历单元的范围 例如 小日历单元是天。大日历单元是周。那么范围就是7天。就是1-7NSRange rangeUnit = [calendar rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:[NSDate date]];NSLog(@"rangeUnit = %@",NSStringFromRange(rangeUnit));    // rangeUnit = {1, 31}/*3.8 - (BOOL)rangeOfUnit:(NSCalendarUnit)unit startDate:(NSDate **)datep interval:(NSTimeInterval *)tip forDate:(NSDate *)date  //用于返回日期date(参数)所在的那个日历单元unit(参数)的开始时间(sDate)。//其中参数unit指定了日历单元，参数sDate用于返回日历单元的第一天，参数unitSecs用于返回日历单元的长度(以秒为单位)，参数date指定了一个特定的日期。//如果startDate和interval均为可计算的，那么函数返回YES否则返回NO.*/NSDate *dateOut = [NSDate date];NSDateComponents *dc = [[NSDateComponents alloc] init];dc.year = 2014;dc.month = 10;dc.day = 1;NSDate *dateCalendar = [currentcalender dateFromComponents:dc];NSTimeInterval startTime;NSTimeInterval *startTimeInt = &startTime;if ([calendar rangeOfUnit:NSCalendarUnitDay startDate:&dateOut interval:startTimeInt forDate:dateCalendar]) {NSLog(@"%@",[dateOut description]);  // 2014-09-30 16:00:00 +0000NSLog(@"%f",*startTimeInt); // 86400.000000}else{NSLog(@"Can not be calculated!");}//3.9 - (NSTimeZone *)timeZone//返回日历指定的时区信息。NSTimeZone *timeZone = [calendar timeZone];NSLog(@"timeZone = %@",timeZone.abbreviation);  // timeZone = GMT+8/** 4 Calendrical Calculations  日历计算*///4.1  - (NSDateComponents *)components:(NSUInteger)unitFlags fromDate:(NSDate *)date// NSDateComponents 返回时间组件unsigned unitFlags =  NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;NSDate *date = [NSDate date];NSDateComponents *components = [calendar components:unitFlags fromDate:date];int year = components.year;int month = components.month;int day = components.day;int hour = components.hour;int minute = components.minute;int second = components.second;NSLog(@"%d,%d,%d,%d,%d,%d",year,month,day,hour,minute,second); // 2014,12,7,17,51,32//4.2  - (NSDateComponents *)components:(NSUInteger)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSUInteger)opts//返回时间组件 比较2个日期的时间差值NSDate *startDate = date;NSDate *endDate = [[NSDate alloc] initWithTimeIntervalSinceNow:86400*2 ];unsigned int unitFlags2 = NSCalendarUnitYear | NSCalendarUnitMonth |NSCalendarUnitDay;NSDateComponents *comps2 = [calendar components:unitFlags2 fromDate:startDate  toDate:endDate  options:0];int years = [comps2 year];int months = [comps2 month];int days = [comps2 day];NSLog(@"years = %d ,months = %d days = %d",years,months,days);  // years = 0 ,months = 0 days = 2//输出: years = 0 ,months = 0 days = 2// 4.3 - (NSDate *)dateByAddingComponents:(NSDateComponents *)comps toDate:(NSDate *)date options:(NSUInteger)opts// 追加日期 并返回一个新日期NSDate *currentDate = [NSDate date];NSDateComponents *comps3 = [[NSDateComponents alloc] init];[comps3 setMonth:2];[comps3 setDay:3];NSDate *newDate = [calendar dateByAddingComponents:comps3 toDate:currentDate  options:0];NSLog(@"newDate = %@",newDate);  // newDate = 2015-02-10 09:51:32// 4.4    - (NSDate *)dateFromComponents:(NSDateComponents *)comps//创建日期NSDateComponents *comps = [[NSDateComponents alloc] init];[comps setYear:2014];[comps setMonth:10];[comps setDay:1];[comps setHour:12];[comps setMinute:0];[comps setSecond:0];NSDate *createdate = [calendar dateFromComponents:comps];NSLog(@"createdate = %@",createdate);  // createdate = 2014-10-01 04:00:00 +0000

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