iOS 微信生成聊天日期

最新推荐文章于 2025-05-23 22:49:03 发布

chufengruan8170

最新推荐文章于 2025-05-23 22:49:03 发布

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文章标签：移动开发

原文链接：https://my.oschina.net/u/564793/blog/355618

版权

#import <Foundation/Foundation.h>

@interface ChatTimeUtil : NSObject

-(NSString *)showDate:(NSDate *)d;

//nsstring 转 nsdate

- (NSDate *)dateFromString:(NSString *)dateString format:(NSString *)format;

@end

// ChatTimeUtil.m

// Test1111

// Created by victor-lee on 14-12-11.

#import "ChatTimeUtil.h"

@interface ChatTimeUtil(){

NSDate *a;

}

@end

@implementation ChatTimeUtil

//如果一个方法中，需要外部变量时，而且这个变量有生命周期时，就不能用工具类.

-(NSString *)showDate:(NSDate *)date{

NSDate *tmpDate =[[NSDate alloc] initWithTimeIntervalSinceReferenceDate:([a timeIntervalSinceReferenceDate] + 5*60)];

if([tmpDate earlierDate:date] == tmpDate){

a = date;

if([self isToday:date]){

return [self stringFromDate:date format:@"HH:mm"];

}else{

return [self returnDate:date];

}

return nil;

}

//nsstring 转 nsdate

- (NSDate *)dateFromString:(NSString *)dateString format:(NSString *)format{

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

[dateFormatter setDateFormat: format];

NSDate *destDate= [dateFormatter dateFromString:dateString];

return destDate;

}

//nsdate 转 nsstring

- (NSString *)stringFromDate:(NSDate *)date format:(NSString *)format{

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

[dateFormatter setDateFormat:format];

return [dateFormatter stringFromDate:date];

}

//如果日期是一星期内，便返回星期N，如果是一星期前就返回之间的日期

-(NSString *)returnDate:(NSDate *)d{

NSDate *tmpDate =[[NSDate alloc] initWithTimeIntervalSinceReferenceDate:([[NSDate date] timeIntervalSinceReferenceDate] - 7*24*60*60)];

if([tmpDate earlierDate:d] == tmpDate){

NSDateComponents *componets = [[NSCalendar autoupdatingCurrentCalendar] components:NSWeekdayCalendarUnit fromDate:d];

;

return [ NSString stringWithFormat:@"%@ %@",[self getWeek:[componets weekday]-1],[self stringFromDate:d format:@"HH:mm"]] ;

}else{

return [self stringFromDate:d format:@"yyyy-MM-dd HH:mm:ss"];

}

//判断是否今天

- ( BOOL )isToday:(NSDate *)d

{

NSCalendar *calendar = [ NSCalendar currentCalendar ];

int unit = NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear ;

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

NSDateComponents *selfCmps = [calendar components :unit fromDate : d ];

return (selfCmps. year == nowCmps. year ) && (selfCmps. month == nowCmps. month ) && (selfCmps. day == nowCmps. day );

}

-(NSString *)getWeek:(NSInteger)week{

switch (week) {

case 1:

return @"星期一";

break;

case 2:

return @"星期二";

break;

case 3:

return @"星期三";

break;

case 4:

return @"星期四";

break;

case 5:

return @"星期五";

break;

case 6:

return @"星期六";

break;

default:

return @"星期日";

break;

}

@end

//---------------------------调用方法--------------

ChatTimeUtil *util = [[ChatTimeUtil alloc] init];

NSLog(@"%@",[util showDate:[util dateFromString:@"2014-12-8 13:26:00" format:@"yyyy-MM-dd HH:mm:ss"]]);

NSLog(@"%@",[util showDate:[util dateFromString:@"2014-12-11 16:26:00" format:@"yyyy-MM-dd HH:mm:ss"]]);

NSLog(@"%@",[util showDate:[util dateFromString:@"2014-12-11 16:30:00" format:@"yyyy-MM-dd HH:mm:ss"]]);

转载于:https://my.oschina.net/u/564793/blog/355618