項目中有聊天功能,老板讓聊天的時間轉換成和 QQ 的聊天時間一樣的格式,
研究了一下,來分析下 QQ 的聊天格式時間

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代碼:
會話列表顯示的時間 如需轉成24小時制,需要使用 HH

//時間顯示內容
-(NSString *)getDateDisplayString:(long long) miliSeconds{
    NSLog(@"-時間戳---%lld_----",miliSeconds);

    NSTimeInterval tempMilli = miliSeconds;
    NSTimeInterval seconds = tempMilli/1000.0;
    NSDate *myDate = [NSDate dateWithTimeIntervalSince1970:seconds];
    
    NSCalendar *calendar = [ NSCalendar currentCalendar ];
    int unit = NSCalendarUnitDay | NSCalendarUnitMonth |  NSCalendarUnitYear ;
    NSDateComponents *nowCmps = [calendar components:unit fromDate:[ NSDate date ]];
    NSDateComponents *myCmps = [calendar components:unit fromDate:myDate];
    
    NSDateFormatter *dateFmt = [[NSDateFormatter alloc ] init ];
    
    //2. 指定日歷對象,要去取日期對象的那些部分.
    NSDateComponents *comp =  [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday fromDate:myDate];
    
    if (nowCmps.year != myCmps.year) {
        dateFmt.dateFormat = @"yyyy-MM-dd hh:mm";
    } else {
        if (nowCmps.day==myCmps.day) {
            dateFmt.AMSymbol = @"上午";
            dateFmt.PMSymbol = @"下午";
            dateFmt.dateFormat = @"aaa hh:mm";
            
        } else if((nowCmps.day-myCmps.day)==1) {
            dateFmt.dateFormat = @"昨天";
        } else {
            if ((nowCmps.day-myCmps.day) <=7) {
                switch (comp.weekday) {
                    case 1:
                        dateFmt.dateFormat = @"星期日";
                        break;
                    case 2:
                        dateFmt.dateFormat = @"星期一";
                        break;
                    case 3:
                        dateFmt.dateFormat = @"星期二";
                        break;
                    case 4:
                        dateFmt.dateFormat = @"星期三";
                        break;
                    case 5:
                        dateFmt.dateFormat = @"星期四";
                        break;
                    case 6:
                        dateFmt.dateFormat = @"星期五";
                        break;
                    case 7:
                        dateFmt.dateFormat = @"星期六";
                        break;
                    default:
                        break;
                }
            }else {
                dateFmt.dateFormat = @"MM-dd hh:mm";
            }
        }
    }
    return [dateFmt stringFromDate:myDate];
}

聊天列表顯示時間:

//時間顯示內容
-(NSString *)getDateDisplayString:(long long) miliSeconds{
    NSLog(@"-時間戳---%lld_----",miliSeconds);
    
    NSTimeInterval tempMilli = miliSeconds;
    NSTimeInterval seconds = tempMilli/1000.0;
    NSDate *myDate = [NSDate dateWithTimeIntervalSince1970:seconds];
    
    NSCalendar *calendar = [ NSCalendar currentCalendar ];
    int unit = NSCalendarUnitDay | NSCalendarUnitMonth |  NSCalendarUnitYear ;
    NSDateComponents *nowCmps = [calendar components:unit fromDate:[ NSDate date ]];
    NSDateComponents *myCmps = [calendar components:unit fromDate:myDate];
    
    NSDateFormatter *dateFmt = [[NSDateFormatter alloc ] init ];
    
    //2. 指定日歷對象,要去取日期對象的那些部分.
    NSDateComponents *comp =  [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday fromDate:myDate];
    
    if (nowCmps.year != myCmps.year) {
        dateFmt.dateFormat = @"yyyy-MM-dd hh:mm";
    } else {
        if (nowCmps.day==myCmps.day) {
            dateFmt.AMSymbol = @"上午";
            dateFmt.PMSymbol = @"下午";
            dateFmt.dateFormat = @"aaa hh:mm";
            
        } else if((nowCmps.day-myCmps.day)==1) {
            dateFmt.AMSymbol = @"上午";
            dateFmt.PMSymbol = @"下午";
            dateFmt.dateFormat = @"昨天 aaahh:mm";

        } else {
            if ((nowCmps.day-myCmps.day) <=7) {
                
                dateFmt.AMSymbol = @"上午";
                dateFmt.PMSymbol = @"下午";
                
                switch (comp.weekday) {
                    case 1:
                        dateFmt.dateFormat = @"星期日 aaahh:mm";
                        break;
                    case 2:
                        dateFmt.dateFormat = @"星期一 aaahh:mm";
                        break;
                    case 3:
                        dateFmt.dateFormat = @"星期二 aaahh:mm";
                        break;
                    case 4:
                        dateFmt.dateFormat = @"星期三 aaahh:mm";
                        break;
                    case 5:
                        dateFmt.dateFormat = @"星期四 aaahh:mm";
                        break;
                    case 6:
                        dateFmt.dateFormat = @"星期五 aaahh:mm";
                        break;
                    case 7:
                        dateFmt.dateFormat = @"星期六 aaahh:mm";
                        break;
                    default:
                        break;
                }
            }else {
                dateFmt.dateFormat = @"MM-dd hh:mm";
            }
        }
    }
    return [dateFmt stringFromDate:myDate];
}