①NSCalendar自带方法就能判断一个日期是否是今天还是明天
+ (NSString *)checkTheDate:(NSString *)string{
NSDateFormatter *format = [[NSDateFormatter alloc]init];
[format setDateFormat:@"yyyy-MM-dd"];
NSDate *date = [format dateFromString:string];
BOOL isToday = [[NSCalendar currentCalendar] isDateInToday:date];
NSString *strDiff = nil;
if(isToday) {
strDiff= [NSString stringWithFormat:@"今天"];
}
return strDiff;
}
NSCalendar其他判断方法
- (BOOL)isDate:(NSDate *)date1 inSameDayAsDate:(NSDate *)date2//判断两个日期是否是同一天
- (BOOL)isDateInToday:(NSDate *)date; //判断一个日期是否是今天
- (BOOL)isDateInYesterday:(NSDate *)date; //判断一个日期是否是昨天
- (BOOL)isDateInTomorrow:(NSDate *)date;//判断一个日期是否是明天
- (BOOL)isDateInWeekend:(NSDate *)date ; //判断一个日期是否是在本周
②
/**
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
{
// 2018-05-01
NSDate *nowDate = [[NSDate date] dateWithYMD];
// 2017-04-30
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;
}
/**
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;
}
/**
返回一个只有年月日的时间
*/
- (NSDate *)dateWithYMD
{
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd";
NSString *selfStr = [fmt stringFromDate:self];
return [fmt dateFromString:selfStr];
}
/**
获得与当前时间的差距
*/
- (NSDateComponents *)deltaWithNow
{
NSCalendar *calendar = [NSCalendar currentCalendar];
int unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
return [calendar components:unit fromDate:self toDate:[NSDate date] options:0];
}
