iOS 日期的简洁格式展示

首先我要解释一下标题的意义，日期的简洁格式展示，之所以简介，是因为让人一目了然，不需要思考是什么时候。

在详细一点就是我们在微信朋友圈中 所看到的时间格式。

例如：刚刚 －几分钟前－几小时前等等。

#import <Foundation/Foundation.h>

@interface NSDate (CXExtension)

-(NSDateComponents *)dateFrom:(NSDate *)from;

-(BOOL)isThisYear;
-(BOOL)isToday;
-(BOOL)isYesterday;

@end

 

.m

#import "NSDate+CXExtension.h"

@implementation NSDate (CXExtension)

-(NSDateComponents *)dateFrom:(NSDate *)from{
    //日历
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSCalendarUnit unit = NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;
    
    return [calendar components:unit fromDate:from toDate:self options:0 ];
}
//判断是否为今年
-(BOOL)isThisYear{
    
    NSCalendar * calendar = [NSCalendar currentCalendar];
    
    NSInteger nowYear = [calendar component:NSCalendarUnitYear fromDate:[NSDate date]];
    NSInteger selfYear = [calendar component:NSCalendarUnitYear fromDate:self];
    
    return selfYear == nowYear;
    
}
//判读是否为今天
-(BOOL)isToday{
    
    NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
    
    formatter.dateFormat = @"yyyy-MM-dd";
    
    NSString * nowDate = [formatter stringFromDate:[NSDate date]];
    NSString * selfDate = [formatter stringFromDate:self];
    
    return [nowDate isEqualToString:selfDate];
    
}
//判断是否为昨天
-(BOOL)isYesterday{
    
    NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
    
    formatter.dateFormat = @"yyyy-MM-dd";
    
    NSDate * nowDate = [formatter dateFromString:[formatter stringFromDate:[NSDate date]]];
    NSDate * selfdate = [formatter dateFromString:[formatter stringFromDate:self]];
    
    NSCalendar * calendar = [NSCalendar currentCalendar];
    
    NSDateComponents * unit = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:selfdate toDate:nowDate options:0];
    return unit.year == 0 && unit.month == 0 && unit.day == 1;
    
}
@end

 

下面的实力所展现的效果：

当时间为去年时 显示全部时间格式

当时间为今年时分为以下情况

当时间为今天是判断具体时间

产生几小时前

几分钟前

刚刚的显示格式

当时间为昨天是 显示昨天以及时分秒

当时间既不是今天又不是昨天时

显示除年以外的所有时间格式

 

-(NSString *)create_time{
    NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
    formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
    NSDate * creat = [formatter dateFromString:_create_time];
    if (creat.isThisYear) {
        
        if (creat.isToday) {
            
            NSDateComponents * unit = [creat dateFrom:creat];
            if (unit.hour > 1) {
                return [NSString stringWithFormat:@"%zd小时前",unit.hour];
            }else if (unit.minute > 1){
                return [NSString stringWithFormat:@"%zd分钟前",unit.minute];
            }else{
                return @"刚刚";
            }
        }else if (creat.isYesterday){
            formatter.dateFormat = @"昨天 HH:mm:ss";
            return[formatter stringFromDate:creat];
        }else{
            formatter.dateFormat = @"MM-dd HH:mm:ss";
            return [formatter stringFromDate:creat];
        }
    }
    else{
        return[formatter stringFromDate:creat];
    }
}