- (NSString *)create_time
{
// 日期格式化类
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
// 设置日期格式(y:年,M:月,d:日,H:时,m:分,s:秒)
fmt.dateFormat = @"yyyy-MM-dd HH:mm:ss";
// 帖子的创建时间_create_time 是返回的时间;
NSDate *create = [fmt dateFromString:_create_time];
if (create.isThisYear) { // 今年
if (create.isToday) { // 今天
NSDateComponents *cmps = [[NSDate date] deltaFrom:create];
if (cmps.hour >= 1) { // 时间差距 >= 1小时
return [NSString stringWithFormat:@"%zd小时前", cmps.hour];
} else if (cmps.minute >= 1) { // 1小时 > 时间差距 >= 1分钟
return [NSString stringWithFormat:@"%zd分钟前", cmps.minute];
} else { // 1分钟 > 时间差距
return @"刚刚";
}
} else if (create.isYesterday) { // 昨天
fmt.dateFormat = @"昨天 HH:mm:ss";
return [fmt stringFromDate:create];
} else { // 其他
fmt.dateFormat = @"MM-dd HH:mm:ss";
return [fmt stringFromDate:create];
}
} else { // 非今年
return _create_time;
}
}
注意 使用时需要创建NSDate一个分类
在.h文件中
#import <Foundation/Foundation.h>
@interface NSDate (HCL)
/**
* 比较from和self的时间差值
*/
- (NSDateComponents *)deltaFrom:(NSDate *)from;
/**
* 是否为今年
*/
- (BOOL)isThisYear;
/**
* 是否为今天
*/
- (BOOL)isToday;
/**
* 是否为昨天
*/
- (BOOL)isYesterday;
@end
在.m文件中
#import "NSDate+HCL.h"
@implementation NSDate (HCL)
- (NSDateComponents *)deltaFrom:(NSDate *)from
{
// 日历
NSCalendar *calendar = [NSCalendar currentCalendar];
// 比较时间
NSCalendarUnit unit = NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
return [calendar components:unit fromDate:from toDate:self options:0];
}
- (BOOL)isThisYear
{
// 日历
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger nowYear = [calendar component:NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger selfYear = [calendar component:NSCalendarUnitYear fromDate:self];
return nowYear == selfYear;
}
- (BOOL)isToday
{
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd";
NSString *nowString = [fmt stringFromDate:[NSDate date]];
NSString *selfString = [fmt stringFromDate:self];
return [nowString isEqualToString:selfString];
}
- (BOOL)isYesterday
{
// 2014-12-31 23:59:59 -> 2014-12-31
// 2015-01-01 00:00:01 -> 2015-01-01
// 日期格式化类
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd";
NSDate *nowDate = [fmt dateFromString:[fmt stringFromDate:[NSDate date]]];
NSDate *selfDate = [fmt dateFromString:[fmt stringFromDate:self]];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *cmps = [calendar components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:selfDate toDate:nowDate options:0];
return cmps.year == 0
&& cmps.month == 0
&& cmps.day == 1;
}
@end
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