iOS 获取某年有几周，获取某年某周的日期范围

骑猪看日落 2024-04-20 08:27 2阅读 0赞

//NSString转NSDate
    +(NSDate *)dateFromString:(NSString *)dateString DateFormat:(NSString *)DateFormat{
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:DateFormat];
        NSDate *destDate= [dateFormatter dateFromString:dateString];
        return destDate;
    }
    
    //获取年月日对象
    +(NSDateComponents *)getDateComponents:(NSDate *)date {
        NSCalendar *calendar = [NSCalendar currentCalendar];
    //    [calendar setFirstWeekday:2]; //设置每周的开始是星期一
    //    [calendar setMinimumDaysInFirstWeek:7]; //设置一周至少需要几天
        return [calendar components:
                NSYearCalendarUnit|
                NSMonthCalendarUnit|
                NSDayCalendarUnit|
                NSWeekOfYearCalendarUnit|
                NSQuarterCalendarUnit fromDate:date];
    }
    
    //获得某年的周数
    +(NSInteger)getWeek_AccordingToYear:(NSInteger)year {
        
        NSDateComponents *comps = [DataTimeTool getDateComponents:[DataTimeTool dateFromString:[NSString stringWithFormat:@"%ld-12-31",year] DateFormat:@"yyyy-MM-dd"]];
        NSInteger week = [comps weekOfYear];
        if (week == 1) {
            return 52;
        }else {
            return week;
        }
    }
    
    /**
     *  获取某年某周的范围日期
     *
     *  @param year       年份
     *  @param weekofYear year里某个周
     *
     *  @return 时间范围字符串
     */
    +(NSString*)getWeekRangeDate_Year:(NSInteger)year WeakOfYear:(NSInteger)weekofYear
    {
        NSString *weekDate = @"";
        NSString *timeAxis = [NSString stringWithFormat:@"%ld-06-01 12:00:00",(long)year];
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        NSDate *date = [dateFormatter dateFromString:timeAxis];
        
        NSCalendar *calendar = [NSCalendar currentCalendar];
        /**这两个参数的设置影响着周次的个数和划分*****************/
        [calendar setFirstWeekday:2]; //设置每周的开始是星期一
    //    [calendar setMinimumDaysInFirstWeek:7]; //设置一周至少需要几天
        NSDateComponents *comps = [calendar components:(NSCalendarUnitWeekOfYear | NSCalendarUnitWeekday | NSCalendarUnitWeekdayOrdinal | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)
                                              fromDate:date];
        //时间轴是当前年的第几周
        NSInteger todayIsWeek = [comps weekOfYear];
        if ([DataTimeTool getWeek_AccordingToYear:year] == 53) {
            todayIsWeek += 1;
        }
        //获取时间轴是星期几 1(星期天) 2(星期一) 3(星期二) 4(星期三) 5(星期四) 6(星期五) 7(星期六)
        NSInteger todayIsWeekDay = [comps weekday];
        // 计算当前日期和这周的星期一和星期天差的天数
        //firstDiff 星期一相差天数 、 lastDiff 星期天相差天数
        long firstDiff,lastDiff;
        if (todayIsWeekDay == 1) {
            firstDiff = -6;
            lastDiff = 0;
        }else
        {
            firstDiff = [calendar firstWeekday] - todayIsWeekDay;
            lastDiff = 8 - todayIsWeekDay;
        }
        
        NSDate *firstDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*firstDiff sinceDate:date];
        NSDate *lastDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*lastDiff sinceDate:date];
        
        long weekdifference = weekofYear - todayIsWeek;
        
        firstDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*7*weekdifference sinceDate:firstDayOfWeek];
        lastDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*7*weekdifference sinceDate:lastDayOfWeek];
        
        weekDate = [NSString stringWithFormat:@"(%@～%@)",[DataTimeTool stringFromDate:firstDayOfWeek DateFormat:@"y年M月d日"],[DataTimeTool stringFromDate:lastDayOfWeek DateFormat:@"y年M月d日"]];
    
        //weekDate = [NSString stringWithFormat:@"第%ld周(%@-%@)",weekofYear,[DataTimeTool stringFromDate:firstDayOfWeek DateFormat:@"yyyy年M月d号"],[DataTimeTool stringFromDate:lastDayOfWeek DateFormat:@"yyyy年M月d号"]];
        
        return weekDate;
    }