NSDate添加常用Category，用于得到是否是今天，昨天等

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1、使用说明

    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];    fmt.dateFormat = @"yyyy-MM-dd HH:mm:ss.S";    NSDate *createDate = @"从接口中得到的时间";    if (createDate.isThisYear) {        if (createDate.isToday) { // 今天            NSDateComponents *cmps = [createDate deltaWithNow];            if (cmps.hour >= 1) { // 至少是1小时前发的                status.created_at =  [NSString stringWithFormat:@"%ld小时前", (long)cmps.hour];            } else if (cmps.minute >= 1) { // 1~59分钟之前发的                status.created_at = [NSString stringWithFormat:@"%ld分钟前", (long)cmps.minute];            } else { // 1分钟内发的                status.created_at = @"刚刚";            }        } else if (createDate.isYesterday) { // 昨天            fmt.dateFormat = @"昨天 HH:mm";            status.created_at = [fmt stringFromDate:createDate];        } else { // 至少是前天            fmt.dateFormat = @"MM-dd HH:mm";            status.created_at = [fmt stringFromDate:createDate];        }    } else { // 非今年        fmt.dateFormat = @"yyyy-MM-dd";        status.created_at = [fmt stringFromDate:createDate];    }

2、实现细节
NSDate+Estension.h文件

@interface NSDate (Estension)/** *  是否为今天 */- (BOOL)isToday;/** *  是否为昨天 */- (BOOL)isYesterday;/** *  是否为今年 */- (BOOL)isThisYear;/** *  返回一个只有年月日的时间 */- (NSDate *)dateWithYMD;/** *  获得与当前时间的差距 */- (NSDateComponents *)deltaWithNow;@end

NSDate+Estension.m文件

@implementation NSDate (Estension)/** *  是否为今天 */- (BOOL)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)isYesterday{    // 2014-05-01    NSDate *nowDate = [[NSDate date] dateWithYMD];    // 2014-04-30    NSDate *selfDate = [self 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 *)dateWithYMD{    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];    fmt.dateFormat = @"yyyy-MM-dd";    NSString *selfStr = [fmt stringFromDate:self];    return [fmt dateFromString:selfStr];}/** *  是否为今年 */- (BOOL)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;}- (NSDateComponents *)deltaWithNow{    NSCalendar *calendar = [NSCalendar currentCalendar];    int unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;    return [calendar components:unit fromDate:self toDate:[NSDate date] options:0];}@end

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