iOS 开发中农历与公历的转换，星座计算。

上一个项目开发中遇到的需求，用户选择出生日期后自动计算出对应的农历。用到这种工具类，必定百度谷歌。结果翻了个遍没看到靠谱的，基本都是用的iOS自带的农历算法然后抄个遍。但是这个算法有点小误差，而且农历这种博大精深的东西不像公历是个死的，还要推算出来。终于终于终于在某个角落找到个靠谱的可以使用，所以分享出来，不过现在我也找不出来源了，但还是感谢原作者。

//  LunarSolarConverter.h

#import <Foundation/Foundation.h>

@interface Lunar : NSObject
/**
*是否闰月
*/
@property(assign) BOOL isleap;
/**
*农历 日
*/
@property(assign) int lunarDay;
/**
*农历 月
*/
@property(assign) int lunarMonth;
/**
*农历 年
*/
@property(assign) int lunarYear;

@end

@interface Solar : NSObject
/**
*公历 日
*/
@property(assign) int solarDay;
/**
*公历 月
*/
@property(assign) int solarMonth;
/**
*公历 年
*/
@property(assign) int solarYear;
@end


@interface LunarSolarConverter : NSObject
/**
*农历转公历
*/
+ (Solar *)lunarToSolar:(Lunar *)lunar;

/**
*公历转农历
*/
+ (Lunar *)solarToLunar:(Solar *)solar;
@end

//  LunarSolarConverter.m

#import "LunarSolarConverter.h"

static int lunar_month_days[] =
        {
                1887, 0x1694, 0x16aa, 0x4ad5, 0xab6, 0xc4b7, 0x4ae, 0xa56, 0xb52a,
                0x1d2a, 0xd54, 0x75aa, 0x156a, 0x1096d, 0x95c, 0x14ae, 0xaa4d, 0x1a4c, 0x1b2a, 0x8d55, 0xad4, 0x135a, 0x495d,
                0x95c, 0xd49b, 0x149a, 0x1a4a, 0xbaa5, 0x16a8, 0x1ad4, 0x52da, 0x12b6, 0xe937, 0x92e, 0x1496, 0xb64b, 0xd4a,
                0xda8, 0x95b5, 0x56c, 0x12ae, 0x492f, 0x92e, 0xcc96, 0x1a94, 0x1d4a, 0xada9, 0xb5a, 0x56c, 0x726e, 0x125c,
                0xf92d, 0x192a, 0x1a94, 0xdb4a, 0x16aa, 0xad4, 0x955b, 0x4ba, 0x125a, 0x592b, 0x152a, 0xf695, 0xd94, 0x16aa,
                0xaab5, 0x9b4, 0x14b6, 0x6a57, 0xa56, 0x1152a, 0x1d2a, 0xd54, 0xd5aa, 0x156a, 0x96c, 0x94ae, 0x14ae, 0xa4c,
                0x7d26, 0x1b2a, 0xeb55, 0xad4, 0x12da, 0xa95d, 0x95a, 0x149a, 0x9a4d, 0x1a4a, 0x11aa5, 0x16a8, 0x16d4,
                0xd2da, 0x12b6, 0x936, 0x9497, 0x1496, 0x1564b, 0xd4a, 0xda8, 0xd5b4, 0x156c, 0x12ae, 0xa92f, 0x92e, 0xc96,
                0x6d4a, 0x1d4a, 0x10d65, 0xb58, 0x156c, 0xb26d, 0x125c, 0x192c, 0x9a95, 0x1a94, 0x1b4a, 0x4b55, 0xad4,
                0xf55b, 0x4ba, 0x125a, 0xb92b, 0x152a, 0x1694, 0x96aa, 0x15aa, 0x12ab5, 0x974, 0x14b6, 0xca57, 0xa56, 0x1526,
                0x8e95, 0xd54, 0x15aa, 0x49b5, 0x96c, 0xd4ae, 0x149c, 0x1a4c, 0xbd26, 0x1aa6, 0xb54, 0x6d6a, 0x12da, 0x1695d,
                0x95a, 0x149a, 0xda4b, 0x1a4a, 0x1aa4, 0xbb54, 0x16b4, 0xada, 0x495b, 0x936, 0xf497, 0x1496, 0x154a, 0xb6a5,
                0xda4, 0x15b4, 0x6ab6, 0x126e, 0x1092f, 0x92e, 0xc96, 0xcd4a, 0x1d4a, 0xd64, 0x956c, 0x155c, 0x125c, 0x792e,
                0x192c, 0xfa95, 0x1a94, 0x1b4a, 0xab55, 0xad4, 0x14da, 0x8a5d, 0xa5a, 0x1152b, 0x152a, 0x1694, 0xd6aa,
                0x15aa, 0xab4, 0x94ba, 0x14b6, 0xa56, 0x7527, 0xd26, 0xee53, 0xd54, 0x15aa, 0xa9b5, 0x96c, 0x14ae, 0x8a4e,
                0x1a4c, 0x11d26, 0x1aa4, 0x1b54, 0xcd6a, 0xada, 0x95c, 0x949d, 0x149a, 0x1a2a, 0x5b25, 0x1aa4, 0xfb52,
                0x16b4, 0xaba, 0xa95b, 0x936, 0x1496, 0x9a4b, 0x154a, 0x136a5, 0xda4, 0x15ac
        };

static int solar_1_1[] =
        {
                1887, 0xec04c, 0xec23f, 0xec435, 0xec649, 0xec83e, 0xeca51, 0xecc46, 0xece3a,
                0xed04d, 0xed242, 0xed436, 0xed64a, 0xed83f, 0xeda53, 0xedc48, 0xede3d, 0xee050, 0xee244, 0xee439, 0xee64d,
                0xee842, 0xeea36, 0xeec4a, 0xeee3e, 0xef052, 0xef246, 0xef43a, 0xef64e, 0xef843, 0xefa37, 0xefc4b, 0xefe41,
                0xf0054, 0xf0248, 0xf043c, 0xf0650, 0xf0845, 0xf0a38, 0xf0c4d, 0xf0e42, 0xf1037, 0xf124a, 0xf143e, 0xf1651,
                0xf1846, 0xf1a3a, 0xf1c4e, 0xf1e44, 0xf2038, 0xf224b, 0xf243f, 0xf2653, 0xf2848, 0xf2a3b, 0xf2c4f, 0xf2e45,
                0xf3039, 0xf324d, 0xf3442, 0xf3636, 0xf384a, 0xf3a3d, 0xf3c51, 0xf3e46, 0xf403b, 0xf424e, 0xf4443, 0xf4638,
                0xf484c, 0xf4a3f, 0xf4c52, 0xf4e48, 0xf503c, 0xf524f, 0xf5445, 0xf5639, 0xf584d, 0xf5a42, 0xf5c35, 0xf5e49,
                0xf603e, 0xf6251, 0xf6446, 0xf663b, 0xf684f, 0xf6a43, 0xf6c37, 0xf6e4b, 0xf703f, 0xf7252, 0xf7447, 0xf763c,
                0xf7850, 0xf7a45, 0xf7c39, 0xf7e4d, 0xf8042, 0xf8254, 0xf8449, 0xf863d, 0xf8851, 0xf8a46, 0xf8c3b, 0xf8e4f,
                0xf9044, 0xf9237, 0xf944a, 0xf963f, 0xf9853, 0xf9a47, 0xf9c3c, 0xf9e50, 0xfa045, 0xfa238, 0xfa44c, 0xfa641,
                0xfa836, 0xfaa49, 0xfac3d, 0xfae52, 0xfb047, 0xfb23a, 0xfb44e, 0xfb643, 0xfb837, 0xfba4a, 0xfbc3f, 0xfbe53,
                0xfc048, 0xfc23c, 0xfc450, 0xfc645, 0xfc839, 0xfca4c, 0xfcc41, 0xfce36, 0xfd04a, 0xfd23d, 0xfd451, 0xfd646,
                0xfd83a, 0xfda4d, 0xfdc43, 0xfde37, 0xfe04b, 0xfe23f, 0xfe453, 0xfe648, 0xfe83c, 0xfea4f, 0xfec44, 0xfee38,
                0xff04c, 0xff241, 0xff436, 0xff64a, 0xff83e, 0xffa51, 0xffc46, 0xffe3a, 0x10004e, 0x100242, 0x100437,
                0x10064b, 0x100841, 0x100a53, 0x100c48, 0x100e3c, 0x10104f, 0x101244, 0x101438, 0x10164c, 0x101842, 0x101a35,
                0x101c49, 0x101e3d, 0x102051, 0x102245, 0x10243a, 0x10264e, 0x102843, 0x102a37, 0x102c4b, 0x102e3f, 0x103053,
                0x103247, 0x10343b, 0x10364f, 0x103845, 0x103a38, 0x103c4c, 0x103e42, 0x104036, 0x104249, 0x10443d, 0x104651,
                0x104846, 0x104a3a, 0x104c4e, 0x104e43, 0x105038, 0x10524a, 0x10543e, 0x105652, 0x105847, 0x105a3b, 0x105c4f,
                0x105e45, 0x106039, 0x10624c, 0x106441, 0x106635, 0x106849, 0x106a3d, 0x106c51, 0x106e47, 0x10703c, 0x10724f,
                0x107444, 0x107638, 0x10784c, 0x107a3f, 0x107c53, 0x107e48
        };

int GetBitInt(int data, int length, int shift) {
    return (data & (((1 << length) - 1) << shift)) >> shift;
}

//WARNING: Dates before Oct. 1582 are inaccurate
long SolarToInt(int y, int m, int d) {
    m = (m + 9) % 12;
    y = y - m / 10;
    return 365 * y + y / 4 - y / 100 + y / 400 + (m * 306 + 5) / 10 + (d - 1);
}

@implementation Lunar : NSObject
@end

@implementation Solar : NSObject
@end

@implementation LunarSolarConverter


+ (Solar *)SolarFromInt:(long)g
{
    long y = (10000 * g + 14780) / 3652425;
    long ddd = g - (365 * y + y / 4 - y / 100 + y / 400);

    if (ddd < 0) {
        y--;
        ddd = g - (365 * y + y / 4 - y / 100 + y / 400);
    }

    long mi = (100 * ddd + 52) / 3060;
    long mm = (mi + 2) % 12 + 1;
    y = y + (mi + 2) / 12;
    long dd = ddd - (mi * 306 + 5) / 10 + 1;
    Solar *solar = [[Solar alloc] init];
    solar.solarYear = (int) y;
    solar.solarMonth = (int) mm;
    solar.solarDay = (int) dd;
    return solar;
}

+ (Solar *)lunarToSolar:(Lunar *)lunar;
{
    int days = lunar_month_days[lunar.lunarYear - lunar_month_days[0]];
    int leap = GetBitInt(days, 4, 13);
    int offset = 0;
    int loopend = leap;

    if (!lunar.isleap) {
        if (lunar.lunarMonth <= leap || leap == 0) {
            loopend = lunar.lunarMonth - 1;
        } else {
            loopend = lunar.lunarMonth;
        }
    }

    for (int i = 0; i < loopend; i++) {
        offset += GetBitInt(days, 1, 12 - i) == 1 ? 30 : 29;
    }

    offset += lunar.lunarDay;

    int solar11 = solar_1_1[lunar.lunarYear - solar_1_1[0]];

    int y = GetBitInt(solar11, 12, 9);
    int m = GetBitInt(solar11, 4, 5);
    int d = GetBitInt(solar11, 5, 0);

    return [self SolarFromInt:(SolarToInt(y, m, d) + offset - 1)];
}

+ (Lunar *)solarToLunar:(Solar *)solar;
{
    Lunar *lunar = [[Lunar alloc] init];
    int index = solar.solarYear - solar_1_1[0];
    int data = (solar.solarYear << 9) | (solar.solarMonth << 5) | (solar.solarDay);
    int solar11 = 0;

    if (solar_1_1[index] > data) {
        index--;
    }

    solar11 = solar_1_1[index];
    int y = GetBitInt(solar11, 12, 9);
    int m = GetBitInt(solar11, 4, 5);
    int d = GetBitInt(solar11, 5, 0);
    long offset = SolarToInt(solar.solarYear, solar.solarMonth, solar.solarDay) - SolarToInt(y, m, d);

    int days = lunar_month_days[index];
    int leap = GetBitInt(days, 4, 13);

    int lunarY = index + solar_1_1[0];
    int lunarM = 1;
    int lunarD = 1;
    offset += 1;

    for (int i = 0; i < 13; i++) {
        int dm = GetBitInt(days, 1, 12 - i) == 1 ? 30 : 29;

        if (offset > dm) {
            lunarM++;
            offset -= dm;
        } else {
            break;
        }
    }

    lunarD = (int) (offset);
    lunar.lunarYear = lunarY;
    lunar.lunarMonth = lunarM;
    lunar.isleap = false;

    if (leap != 0 && lunarM > leap) {
        lunar.lunarMonth = lunarM - 1;

        if (lunarM == leap + 1) {
            lunar.isleap = true;
        }
    }

    lunar.lunarDay = lunarD;
    return lunar;
}


@end

 转换后的农历还可以再格式化一下

- (NSString *)formatlunarWithYear:(int)year AndMonth:(int)month AndDay:(int)day
{
    NSArray *chineseMonths=[NSArray arrayWithObjects:
                            @"正月", @"二月", @"三月", @"四月", @"五月", @"六月", @"七月", @"八月",
                            @"九月", @"十月", @"冬月", @"腊月", nil];
    NSArray *chineseDays=[NSArray arrayWithObjects:
                          @"初一", @"初二", @"初三", @"初四", @"初五", @"初六", @"初七", @"初八", @"初九", @"初十",
                          @"十一", @"十二", @"十三", @"十四", @"十五", @"十六", @"十七", @"十八", @"十九", @"二十",
                          @"廿一", @"廿二", @"廿三", @"廿四", @"廿五", @"廿六", @"廿七", @"廿八", @"廿九", @"三十",  nil];
    return [NSString stringWithFormat:@"%d年%@%@", year, chineseMonths[month - 1], chineseDays[day - 1]];
}

然后就是星座计算，没什么难度，就是算的太麻烦，所以直接拿来用就行了。

-(NSString *)getXingzuo:(NSDate *)in_date
{
    //计算星座
    NSString *retStr=@"";
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"MM"];
    int i_month=0;
    NSString *theMonth = [dateFormat stringFromDate:in_date];
    if([[theMonth substringToIndex:0] isEqualToString:@"0"]){
        i_month = [[theMonth substringFromIndex:1] intValue];
    }else{
        i_month = [theMonth intValue];
    }
    
    [dateFormat setDateFormat:@"dd"];
    int i_day=0;
    NSString *theDay = [dateFormat stringFromDate:in_date];
    if([[theDay substringToIndex:0] isEqualToString:@"0"]){
        i_day = [[theDay substringFromIndex:1] intValue];
    }else{
        i_day = [theDay intValue];
    }
    /*
     摩羯座 12月22日------1月19日
     水瓶座 1月20日-------2月18日
     双鱼座 2月19日-------3月20日
     白羊座 3月21日-------4月19日
     金牛座 4月20日-------5月20日
     双子座 5月21日-------6月21日
     巨蟹座 6月22日-------7月22日
     狮子座 7月23日-------8月22日
     处女座 8月23日-------9月22日
     天秤座 9月23日------10月23日
     天蝎座 10月24日-----11月21日
     射手座 11月22日-----12月21日
     */
    switch (i_month) {
        case 1:
            if(i_day>=20 && i_day<=31){
                retStr=@"水瓶座";
            }
            if(i_day>=1 && i_day<=19){
                retStr=@"摩羯座";
            }
            break;
        case 2:
            if(i_day>=1 && i_day<=18){
                retStr=@"水瓶座";
            }
            if(i_day>=19 && i_day<=31){
                retStr=@"双鱼座";
            }
            break;
        case 3:
            if(i_day>=1 && i_day<=20){
                retStr=@"双鱼座";
            }
            if(i_day>=21 && i_day<=31){
                retStr=@"白羊座";
            }
            break;
        case 4:
            if(i_day>=1 && i_day<=19){
                retStr=@"白羊座";
            }
            if(i_day>=20 && i_day<=31){
                retStr=@"金牛座";
            }
            break;
        case 5:
            if(i_day>=1 && i_day<=20){
                retStr=@"金牛座";
            }
            if(i_day>=21 && i_day<=31){
                retStr=@"双子座";
            }
            break;
        case 6:
            if(i_day>=1 && i_day<=21){
                retStr=@"双子座";
            }
            if(i_day>=22 && i_day<=31){
                retStr=@"巨蟹座";
            }
            break;
        case 7:
            if(i_day>=1 && i_day<=22){
                retStr=@"巨蟹座";
            }
            if(i_day>=23 && i_day<=31){
                retStr=@"狮子座";
            }
            break;
        case 8:
            if(i_day>=1 && i_day<=22){
                retStr=@"狮子座";
            }
            if(i_day>=23 && i_day<=31){
                retStr=@"处女座";
            }
            break;
        case 9:
            if(i_day>=1 && i_day<=22){
                retStr=@"处女座";
            }
            if(i_day>=23 && i_day<=31){
                retStr=@"天秤座";
            }
            break;
        case 10:
            if(i_day>=1 && i_day<=23){
                retStr=@"天秤座";
            }
            if(i_day>=24 && i_day<=31){
                retStr=@"天蝎座";
            }
            break;
        case 11:
            if(i_day>=1 && i_day<=21){
                retStr=@"天蝎座";
            }
            if(i_day>=22 && i_day<=31){
                retStr=@"射手座";
            }
            break;
        case 12:
            if(i_day>=1 && i_day<=21){
                retStr=@"射手座";
            }
            if(i_day>=21 && i_day<=31){
                retStr=@"摩羯座";
            }
            break;
    }
    return retStr;
}