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最新推荐文章于 2025-05-05 19:59:35 发布

转载最新推荐文章于 2025-05-05 19:59:35 发布 · 101 阅读

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原文链接：http://www.cnblogs.com/PJXWang/p/5520763.html

本文详细介绍了如何使用Objective-C中的NSDate类扩展来实现日期时间的格式化，包括判断日期是否在今年、今天或昨天，以及如何根据不同的时间范围展示友好的时间提示。

今年：

　　今天：　　

　　　　刚刚，小于一分钟
　　　　n分钟前，大于一分钟，小于一小时
　　　　HH:mm:ss 大于一小时，今天之内

　　昨天：

　　　　昨天：HH：mm：ss 昨天

　　其他：

　　　　MM-dd HH:mm:ss 不是今天和昨天，但在今年内

非今年：

　　yyyy-MM-dd HH:mm:ss 不在今年

算法实现

扩展NSDate类：

@interface NSDate (PJXExtension)

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

-(BOOL)isThisYear;

-(BOOL)isToday;

-(BOOL)isYesterday;

@end

#import "NSDate+PJXExtension.h"

@implementation NSDate (PJXExtension)

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

{

//日历对象

NSCalendar *calendar = [NSCalendar currentCalendar];

//比较时间

NSDateComponents *cmps = [calendar components:unit fromDate:from toDate:self options:kNilOptions];

return cmps;

}

-(BOOL)isThisYear

{

NSCalendar *calendar = [NSCalendar currentCalendar];

NSInteger nowYear = [calendar component:NSCalendarUnitYear fromDate:[NSDate date]];

NSInteger selfYear =[calendar component:NSCalendarUnitYear fromDate:self];

return nowYear == selfYear;

}

-(BOOL)isToday

{

NSCalendar *calendar = [NSCalendar currentCalendar];

NSCalendarUnit unit = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;

NSDateComponents *nowCmp = [calendar components:unit fromDate:[NSDate date]];

NSDateComponents *selfCmp = [calendar components:unit fromDate:self];

return nowCmp.year == selfCmp.year

&& nowCmp.month == selfCmp.month

&& nowCmp.day == selfCmp.day;

// //利用日历对象比较是否是今天

// NSDateFormatter *fmt = [[NSDateFormatter alloc]init];

// fmt.dateFormat = @"yyyy-MM-dd";

// NSString *nowStr = [fmt stringFromDate:[NSDate date]];

// NSString *selfStr = [fmt stringFromDate:self ];

// return [nowStr isEqualToString:selfStr];

}

-(BOOL)isYesterday

{

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];

NSCalendarUnit unit = NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay;

NSDateComponents *cmps = [calendar components:unit fromDate:selfDate toDate:nowDate options:kNilOptions];

return cmps.year==0

&& cmps.month == 0

&& cmps.day == 1;

}

@end

在显示类中实现

-(NSString *)setTime:(NSString *)time

{

NSLog(@"NSString time:%@",time);

//获得发帖的时间

NSDateFormatter *fmt = [[NSDateFormatter alloc]init];

fmt.dateFormat = @"yyyy-MM-dd HH:mm:ss";

NSDate *creat = [fmt dateFromString:time];

//显示时间的设置

NSString *text = nil;

if (creat.isThisYear) {

if(creat.isToday){

NSDateComponents *cmp = [[NSDate date] dateFrom:creat];

if (cmp.hour >= 1) {

text = [NSString stringWithFormat:@"%zd小时前",cmp.hour];

}else if(cmp.minute >= 1){

text = [NSString stringWithFormat:@"%zd分钟前",cmp.minute];

}else{

text = @"刚刚";

}

}else if(creat.isYesterday){

fmt.dateFormat = @"昨天: HH:mm:ss";

text = [fmt stringFromDate:creat];

}else{

fmt.dateFormat = @"MM-dd HH:mm:ss";

text = [fmt stringFromDate:creat];

}

}else{

text = time;

}

NSLog(@"Display time:%@",text);

return text;

}

转载于:https://www.cnblogs.com/PJXWang/p/5520763.html