JSJP_Student/jiaPei/Utils/Category/NSDate/NSDate+RQExtension.m

//
//  NSDate+RQExtension.m
//  RQCommon
//
//  Created by 张嵘 on 2018/11/23.
//  Copyright © 2018 张嵘. All rights reserved.
//

#import "NSDate+RQExtension.h"

#define DATE_COMPONENTS (NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekOfMonth | NSCalendarUnitWeekOfYear |  NSCalendarUnitWeekday | NSCalendarUnitWeekdayOrdinal)


#define CURRENT_CALENDAR [NSCalendar currentCalendar]
@implementation NSDate (RQExtension)
/**
 *  是否为今天
 */
- (BOOL)rq_isToday
{
	NSCalendar *calendar = [NSCalendar currentCalendar];
	int unit = NSCalendarUnitDay | NSCalendarUnitMonth |  NSCalendarUnitYear;
	
	// 1.获得当前时间的年月日
	NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];
	
	// 2.获得self的年月日
	NSDateComponents *selfCmps = [calendar components:unit fromDate:self];
	return
	(selfCmps.year == nowCmps.year) &&
	(selfCmps.month == nowCmps.month) &&
	(selfCmps.day == nowCmps.day);
}

/**
 *  是否为昨天
 */
- (BOOL)rq_isYesterday
{
	// 2014-05-01
	NSDate *nowDate = [[NSDate date] rq_dateWithYMD];
	
	// 2014-04-30
	NSDate *selfDate = [self rq_dateWithYMD];
	
	// 获得nowDate和selfDate的差距
	NSCalendar *calendar = [NSCalendar currentCalendar];
	NSDateComponents *cmps = [calendar components:NSCalendarUnitDay fromDate:selfDate toDate:nowDate options:0];
	return cmps.day == 1;
}

- (NSDate *)rq_dateWithYMD
{
	NSDateFormatter *fmt = [NSDateFormatter rq_defaultDateFormatter];
	fmt.dateFormat = @"yyyy-MM-dd";
	NSString *selfStr = [fmt stringFromDate:self];
	return [fmt dateFromString:selfStr];
}


/**
 *  是否为今年
 */
- (BOOL)rq_isThisYear
{
	NSCalendar *calendar = [NSCalendar currentCalendar];
	int unit = NSCalendarUnitYear;
	
	// 1.获得当前时间的年月日
	NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];
	
	// 2.获得self的年月日
	NSDateComponents *selfCmps = [calendar components:unit fromDate:self];
	
	return nowCmps.year == selfCmps.year;
}


// This hard codes the assumption that a week is 7 days
- (BOOL) rq_isSameWeekWithAnotherDate: (NSDate *)anotherDate
{
	NSDateComponents *components1 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
	
	NSDateComponents *components2 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:anotherDate];
	
	// Must be same week. 12/31 and 1/1 will both be week "1" if they are in the same week
	if (components1.weekOfMonth != components2.weekOfMonth) return NO;
	
	// Must have a time interval under 1 week. Thanks @aclark
	return (fabs([self timeIntervalSinceDate:anotherDate]) < RQ_D_WEEK);
}

/**
 *  星期几
 */
- (NSString *)rq_weekDay
{
	NSArray *weekDays = @[@"星期日",@"星期一",@"星期二",@"星期三",@"星期四",@"星期五",@"星期六"];
	
	NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];
	
	//    NSLog(@"NSCalendarUnitWeekday--  components.weekday = %zd  -- components.weekdayOrdinal = %zd  -- components.weekOfYear = %zd  -- components.weekOfMonth = %zd",components.weekday , components.weekdayOrdinal , components.weekOfYear , components.weekOfMonth);
	
	return weekDays[components.weekday - 1];
}



- (BOOL) rq_isThisWeek
{
	return [self rq_isSameWeekWithAnotherDate:[NSDate date]];
}


/**
 *  通过一个时间 固定的时间字符串 "2016-8-10 14:43:45" 返回时间
 *
 *  @param timestamp 固定的时间字符串 "2016-8-10 14:43:45"
 *
 *  @return 时间
 */
+ (instancetype)rq_dateWithTimestamp:(NSString *)timestamp
{
    NSDateFormatter *dateFormatter = [NSDateFormatter rq_defaultDateFormatter];
    [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]];
	return [dateFormatter dateFromString:timestamp];
}


/**
 *  返回固定的 当前时间 2016-8-10 14:43:45
 */
+ (NSString *)rq_currentTimestamp
{
	return [[NSDateFormatter rq_defaultDateFormatter] stringFromDate:[NSDate date]];
}

/**
 * 格式化日期描述
 */
- (NSString *)rq_formattedDateDescription
{
	NSDateFormatter *dateFormatter = nil;
	NSString *result = nil;
	
	if ([self rq_isThisYear])
	{
		// 今年
		if ([self rq_isToday]) {
			// 22:22
			dateFormatter = [NSDateFormatter rq_dateFormatterWithFormat:@"HH:mm"];
		}else if ([self rq_isYesterday]){
			// 昨天 22:22
			dateFormatter = [NSDateFormatter rq_dateFormatterWithFormat:@"昨天 HH:mm"];
		}else if ([self rq_isThisWeek]){
			// 星期二 22:22
			dateFormatter = [NSDateFormatter rq_dateFormatterWithFormat:[NSString stringWithFormat:@"%@ HH:mm" , [self rq_weekDay]]];
		}else{
			// 2016年08月18日 22:22
			dateFormatter = [NSDateFormatter rq_dateFormatterWithFormat:@"yyyy年MM月dd日 HH:mm"];
		}
		
	}else{
		// 非今年
		dateFormatter = [NSDateFormatter rq_dateFormatterWithFormat:@"yyyy年MM月dd日"];
	}
	
	result = [dateFormatter stringFromDate:self];
	
	return result;
}

/** 与当前时间的差距 */
- (NSDateComponents *)rq_deltaWithNow
{
	NSCalendar *calendar = [NSCalendar currentCalendar];
	int unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
	return [calendar components:unit fromDate:self toDate:[NSDate date] options:0];
}




//////////// MVC&MVVM的商品的发布时间的描述 ////////////
- (NSString *)rq_string_yyyy_MM_dd {
	return [self rq_string_yyyy_MM_dd:[NSDate date]];
}

- (NSString *)rq_string_yyyy_MM_dd:(NSDate *)toDate {
	// 设置日期格式（声明字符串里面每个数字和单词的含义）
	// E:星期几
	// M:月份
	// d:几号(这个月的第几天)
	// H:24小时制的小时
	// m:分钟
	// s:秒
	// y:年
	// fmt.dateFormat = @"EEE MMM dd HH:mm:ss Z yyyy";
	
	NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
	// 真机调试，转换这种欧美时间，需要设置locale
	fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
	// fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
	// fmt.locale = [NSLocale currentLocale];
	
	// 由于小闲肉使用的是北京时间，需要减掉8小时时差(转为欧美时间体系)
	NSDate *fromDate = [NSDate dateWithTimeIntervalSince1970:(self.timeIntervalSince1970 - 8*60*60)];
	
	// 日历对象（方便比较两个日期之间的差距）
	NSCalendar *calendar = [NSCalendar currentCalendar];
	// NSCalendarUnit枚举代表想获得哪些差值
	NSCalendarUnit unit = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
	// 计算两个日期之间的差值
	NSDateComponents *cmps = [calendar components:unit fromDate:fromDate toDate:toDate options:0];
	
	if (cmps.year == 0) { // 今年
		if (cmps.year == 0 && cmps.month == 0 && cmps.day == 1) { // 昨天
			// fmt.dateFormat = @"昨天 HH:mm";
			fmt.dateFormat = @"MM-dd HH:mm";
			return [fmt stringFromDate:fromDate];
		} else if (cmps.year == 0 && cmps.month == 0 && cmps.day == 0) { // 今天
			if (cmps.hour >= 1) {
				return [NSString stringWithFormat:@"%d小时前", (int)cmps.hour];
			} else if (cmps.minute >= 1) {
				return [NSString stringWithFormat:@"%d分钟前", (int)cmps.minute];
			} else {
				return @"刚刚";
			}
		} else { // 今年的其他日子
			fmt.dateFormat = @"MM-dd HH:mm";
			return [fmt stringFromDate:fromDate];
		}
	} else { // 非今年
		fmt.dateFormat = @"yyyy-MM-dd HH:mm";
		return [fmt stringFromDate:fromDate];
	}
}
//////////// MVC&MVVM的商品的发布时间的描述 ////////////

@end