IOS SDK Nscalendar & nsdate? Components

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Preface: Nscalendar and NSDate? Components are two classes that are important for the iOS time-related API. It's just been used recently, and it's sorted out here.

Concept

• Nscalendar, as the name implies, is a calendar that encapsulates how the system organizes time by month and day, how the time is organized and the region, and the time zone is of great relevance.
• NSDate? The components are just a container that contains information such as month and day.
• NSDate is an absolute time that can be converted to a relative 1970s of jet lag.

Example

Split a time
Oc

 nsdate  * date = [ Date]; //Current time  nscalendar  * calendar = [nscalendar  Currentcalendar]; //the current user's calendar  nsdatecomponents * components = [Calendar Components:nscalendarunitminute | Nscalendarunitmonth | Nscalendarunithour | Nscalendarunitday Fromdate:date]; nslog  (@, (long ) Components.month , (long ) components .day , (long ) components .hour , (long ) components .minute ); 

Swift

   let date = NSDate()   let calendar = NSCalendar.currentCalendar()   let components = calendar.components(NSCalendarUnit.CalendarUnitMonth | NSCalendarUnit.CalendarUnitDay | NSCalendarUnit.CalendarUnitHour | NSCalendarUnit.CalendarUnitMinute, fromDate:date)   NSLog("%ld月%ld日%ld时%ld分" ,components.month, components.day, components.hour, components.minute)

relative ordinal
For example, view today is the first week of the year

  NSCalendar * calendar = [NSCalendar currentCalendar];    NSDate * currentDate = [NSDate date];    NSInteger week = [calendar ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitYear forDate:currentDate];    NSLog(@"今天是今年的第%ld周",week);

returns nsdate based on split time
Oc

nsdatecomponents * components = [[Nsdatecomponents alloc] init]; Components. Year= -; Components.Month=7; Components. Day= One; Components.Hour=Ten; Components.minute= -; Components.Second= -;    Nscalendar * Calendar = [Nscalendar Currentcalendar]; NSDate *Date= [Calendar datefromcomponents:components];    NSDateFormatter * formatter = [[NSDateFormatter alloc] init]; Formatter.dateformat = @"yyyy mm month DD day hh" mm min ss sec "; NSString * str = [Formatter stringfromdate:Date]; NSLog (@"%@", str);

Swift

   Letcomponents = Nsdatecomponents (). Year= -Components.Month=7Components. Day= OneComponents.Hour=TenComponents.minute= -Components.Second= -         LetCalendar = Nscalendar.currentcalendar () Let Date= calendar.datefromcomponents (components) LetFormatter = NSDateFormatter (); Formatter.dateformat ="yyyy mm month DD day hh" mm min ss sec "; Letstr = formatter.stringfromdate (Date!); println (str)

Relative time

Now 11 days, 10 hours.
Oc

nsdatecomponents * components = [[Nsdatecomponents alloc] init]; Components. Day= One; Components. Hour=Ten;Nscalendar* Calendar = [NscalendarCurrentcalendar];NSDate* currentdate = [NSDateDate];NSDate* Nextdata = [Calendar datebyaddingcomponents:components todate:currentdate options:nscalendarmatchstrictly];    NSDateFormatter * formatter = [[NSDateFormatter alloc] init]; Formatter. DateFormat= @"yyyy mm month DD day hh" mm min ss sec ";NSString* str = [formatter stringfromdate:nextdata];NSLog(@"%@", str);

Swift

let1110;let calendar = NSCalendar.currentCalendar();let currentDate = NSDate()let nextDate = calendar.dateByAddingComponents(components, toDate: currentDate, options:NSCalendarOptions.MatchStrictly)let"yyyy年MM月dd日hh时mm分ss秒";let  str = formatter.stringFromDate(nextDate!)NSLog("%@",str);

How many days are there this month?

NSCalendar * calendar = [NSCalendar currentCalendar];    NSDate * currentDate = [NSDate date];    NSRange range = [calendar rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:currentDate];

Other

Create Nscalendar in different regions

initWithCalendarIdentifier:

One of the effective identifer

NSString*ConstNsgregoriancalendar;NSString*ConstNsbuddhistcalendar;NSString*ConstNschinesecalendar;NSString*ConstNshebrewcalendar;NSString*ConstNsislamiccalendar;NSString*ConstNsislamiccivilcalendar;NSString*ConstNsjapanesecalendar;NSString*ConstNsrepublicofchinacalendar;NSString*ConstNspersiancalendar;NSString*ConstNsindiancalendar;NSString*ConstNsiso8601calendar;

Start date of the week

– firstWeekday

Time Zones and regions

localetimeZone

All the Nscalendarunit

   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 = kCFCalendarUnitYearForWeekOfYear    NSCalendarCalendarUnit = (1 << 20),   NSTimeZoneCalendarUnit = (1 << 21),

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IOS SDK Nscalendar & nsdate? Components