一个简单的计算获得的日期与现在的日期差

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-(NSString *)getDate:(NSString *)str{    NSString *date = [[NSString alloc]init];    int day = (int)[self getWeak:str];    if (day>0) {        if (day>7) {            NSArray *arr = [str componentsSeparatedByString:@"-"];            NSString *pMon = [arr objectAtIndex:1];            NSString *pDay = [arr objectAtIndex:2];            int mon = [pMon intValue]-1;            NSArray *monArr = @[@"一月",@"二月",@"三月",@"四月",@"五月",@"六月",@"七月",@"八月",@"九月",@"十月",@"十一月",@"十二月"];            date = [NSString stringWithFormat:@"%@\n%@",pDay,[monArr objectAtIndex:mon]];        }        else{            NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];            dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh-CN"];            [dateFormatter setDateFormat: @"yyyy.MM.dd.EEEE"];            NSDate *today = [NSDate date];            NSString *st = [dateFormatter stringFromDate:today];            NSArray *arr = [st componentsSeparatedByString:@"."];            NSString *pWeek = [arr objectAtIndex:3];                        NSArray *arr1 = @[@"星期一",@"星期二",@"星期三",@"星期四",@"星期五",@"星期六",@"星期日"];            NSArray *arr2 = @[@"周一",@"周二",@"周三",@"周四",@"周五",@"周六",@"周日"];            NSArray *arr3 = @[@"下周一",@"下周二",@"下周三",@"下周四",@"下周五",@"下周六",@"下周日"];                        for (int i=0; i<[arr1 count]; i++) {                int a = 0;                if ([pWeek isEqualToString:[arr1 objectAtIndex:i]]) {                    a = i;                    int dd = a+day;                    if (day==0) {                        date = @"今天";                    }else if (day==1){                        date = @"明天";                    }else if (dd < 7) {                        date = [arr2 objectAtIndex:dd];                    }else if (dd >= 7 && dd<14){                        int w = dd%7;                        date = [arr3 objectAtIndex:w];                    }                }            }        }    }else{        NSArray *arr = [str componentsSeparatedByString:@"-"];        NSString *pMon = [arr objectAtIndex:1];        NSString *pDay = [arr objectAtIndex:2];        int mon = [pMon intValue]-1;        NSArray *monArr = @[@"一月",@"二月",@"三月",@"四月",@"五月",@"六月",@"七月",@"八月",@"九月",@"十月",@"十一月",@"十二月"];        date = [NSString stringWithFormat:@"%@\n%@",pDay,[monArr objectAtIndex:mon]];    }    return date;}-(NSInteger)getWeak:(NSString *)time{    NSDate *today = [NSDate date];    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat: @"yyyy-MM-dd"];    NSString *st = [dateFormatter stringFromDate:today];        NSDate *staDate = [dateFormatter dateFromString:st];        NSDateFormatter *dateFor = [[NSDateFormatter alloc] init];    [dateFor setDateFormat: @"yyyy-MM-dd"];    NSDate *endDate =[dateFor dateFromString:time];        NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];        NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit;        NSDateComponents *components = [gregorian components:unitFlags fromDate:staDate toDate:endDate options:0];        NSInteger days = [components day];    return days;}

写的可能有些负责和啰嗦

getDate 这个方法中，传入的日期格式为 yyyy-MM-dd

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