ios/Timi/Class/Base/Utils/NumberTool/CaculateNumberTool.m

//
//  CaculateNumberTool.m
//  Starbuds
//
//  Created by 翟玉磊 on 2020/2/9.
//  Copyright © 2020 翟玉磊. All rights reserved.
//

#import "CaculateNumberTool.h"

@implementation CaculateNumberTool

static NSNumberFormatter *formater;
static NSDictionary *configDict;

+ (void)initialize {
    if (self == [CaculateNumberTool class]) {
        formater = [[NSNumberFormatter alloc] init];
        // 可自行扩展
        configDict = @{
            @"qian": @{
                @"unit": kLocalizedString(@"千"),
                @"enUnit": @"k",
                @"dividend": @(1000.0)
            },
            @"wan": @{
                @"unit": kLocalizedString(@"万"),
                @"enUnit": @"w",
                @"dividend": @(10000.0)
            },
            @"yi": @{
                @"unit": kLocalizedString(@"亿"),
                @"enUnit": @"y",
                @"dividend": @(100000000.0)
            },
            @"wanYi": @{
                @"unit": kLocalizedString(@"万亿"),
                @"enUnit": @"wy",
                @"dividend": @(1000000000000.0)
            }
        };
    }
}

+ (NSString *)stringFromNumber:(double)number toFixedCount:(NSInteger)toFixed roundingMode:(CNRoundingMode)roundingMode {
    return [CaculateNumberTool stringFromNumber:number toFixedCount:toFixed roundingMode:roundingMode unit:YES];
}

/**
 返回数字描述

 @param number 数字
 @param toFixed 保留小数位数
 @param roundingMode 是否四舍五入
 @param unit 是否显示单位
 */
+ (NSString *)stringFromNumber:(double)number toFixedCount:(NSInteger)toFixed roundingMode:(CNRoundingMode)roundingMode unit:(BOOL)unit {
    NSString *output;

    formater.maximumFractionDigits = toFixed;

    if (roundingMode == CNRoundingModeUpAndDown) {
        formater.roundingMode = NSNumberFormatterRoundHalfEven;  // 四舍五入
    } else if (roundingMode == CNRoundingModeOnlyUp) {
        formater.roundingMode = NSNumberFormatterRoundCeiling;  // 只入不舍
    } else if (roundingMode == CNRoundingModeOnlyDown) {
        formater.roundingMode = NSNumberFormatterRoundFloor;     // 只舍不入
    } else {                                                     // 默认
        formater.roundingMode = NSNumberFormatterRoundHalfEven;  // 四舍五入
    }

    // 如果要五入恰好传入临界值，则h对该值加1，换单位，避免出现10000万这样情况
    if (formater.roundingMode == NSNumberFormatterRoundHalfEven || formater.roundingMode == NSNumberFormatterRoundCeiling) {
        if (number == 9999 || number == 99999999 || number == 999999999999) {
            number = number + 1;
        }
    }

    if (number <= 0) {
        output = @"0";
    } else if (number <= 9999) {
        output = [NSString stringWithFormat:@"%@", [formater stringFromNumber:@(number)]];
    } else if (number <= 99999999) {  // 9999999
        double value = (double)number / [configDict[@"wan"][@"dividend"] doubleValue];
        output = [NSString stringWithFormat:@"%@%@", [formater stringFromNumber:@(value)], unit?configDict[@"wan"][@"unit"]:@""];
    } else if (number <= 999999999999) {  // 999999999999
        double value = (double)number / [configDict[@"yi"][@"dividend"] doubleValue];
        output = [NSString stringWithFormat:@"%@%@", [formater stringFromNumber:@(value)], unit?configDict[@"yi"][@"unit"]:@""];
    } else {
        double value = (double)number / [configDict[@"wanYi"][@"dividend"] doubleValue];
        output = [NSString stringWithFormat:@"%@%@", [formater stringFromNumber:@(value)], unit?configDict[@"wanYi"][@"unit"]:@""];
    }
    return output;
}

/**
 返回拼音单位的数字描述（k、w、y、yw）

 @param number 数字
 @param toFixed 保留小数位数
 @param roundingMode 是否四舍五入
 @param unit 是否显示单位
 */
+ (NSString *)stringFromPinyinNumber:(double)number toFixedCount:(NSInteger)toFixed roundingMode:(CNRoundingMode)roundingMode unit:(BOOL)unit {
    NSString *output;

    formater.maximumFractionDigits = toFixed;

    if (roundingMode == CNRoundingModeUpAndDown) {
        formater.roundingMode = NSNumberFormatterRoundHalfEven;  // 四舍五入
    } else if (roundingMode == CNRoundingModeOnlyUp) {
        formater.roundingMode = NSNumberFormatterRoundCeiling;  // 只入不舍
    } else if (roundingMode == CNRoundingModeOnlyDown) {
        formater.roundingMode = NSNumberFormatterRoundFloor;     // 只舍不入
    } else {                                                     // 默认
        formater.roundingMode = NSNumberFormatterRoundHalfEven;  // 四舍五入
    }

    // 如果要五入恰好传入临界值，则h对该值加1，换单位，避免出现10000万这样情况
    if (formater.roundingMode == NSNumberFormatterRoundHalfEven || formater.roundingMode == NSNumberFormatterRoundCeiling) {
        if (number == 9999 || number == 99999999 || number == 999999999999) {
            number = number + 1;
        }
    }

    if (number <= 0) {
        output = @"0";
    } else if (number <= 999) {
        output = [NSString stringWithFormat:@"%@", [formater stringFromNumber:@(number)]];
    } else if (number <= 9999) {
        double value = (double)number / [configDict[@"qian"][@"dividend"] doubleValue];
        output = [NSString stringWithFormat:@"%@%@", [formater stringFromNumber:@(value)], unit?configDict[@"qian"][@"enUnit"]:@""];
    } else if (number <= 99999999) {  // 9999999
        double value = (double)number / [configDict[@"wan"][@"dividend"] doubleValue];
        output = [NSString stringWithFormat:@"%@%@", [formater stringFromNumber:@(value)], unit?configDict[@"wan"][@"enUnit"]:@""];
    } else if (number <= 999999999999) {  // 999999999999
        double value = (double)number / [configDict[@"yi"][@"dividend"] doubleValue];
        output = [NSString stringWithFormat:@"%@%@", [formater stringFromNumber:@(value)], unit?configDict[@"yi"][@"enUnit"]:@""];
    } else {
        double value = (double)number / [configDict[@"wanYi"][@"dividend"] doubleValue];
        output = [NSString stringWithFormat:@"%@%@", [formater stringFromNumber:@(value)], unit?configDict[@"wanYi"][@"enUnit"]:@""];
    }
    return output;
}


@end