NSNumber 加、减、乘、除 包括 根据需求转换字符串（四舍五入、货币数字、百分比。。。。）
开发中会遇到一些字符串显示看似乱码的情况 比如 2.7E9292
或者说显示的数字和后台的对不上 比如后端返回2.938 前端显示2.938888888
解决方法
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
typedef NS_ENUM(NSUInteger, YQOPERATORS){
YQ_Add,//加
YQ_Mul,//乘
YQ_Sub,//减
YQ_Div//除
};
@interface NSNumber (YQ)
//无格式,四舍五入
- (NSString *)changeToumberFormatterNoStyle;
//小数型,
- (NSString *)changeToNumberFormatterDecimalStyle;
//货币型,
- (NSString *)changeToNumberFormatterCurrencyStyle;
//百分比型
- (NSString *)changeToNumberFormatterPercentStyle;
//科学计数型,
- (NSString *)changeToNumberFormatterScientificStyle;
//全拼
- (NSString *)changeToNumberFormatterSpellOutStyle;
/// 运算方法
/// @param one 第一个数
/// @param opera 运算方式
/// @param two 第二个数
+ (NSNumber *)getResult:(NSNumber *)one operators:(YQOPERATORS)opera num:(NSNumber *)two;
@end
NS_ASSUME_NONNULL_END
//
// NSNumber+YQ.m
// yaqu
//
// Created by 刘浩宇 on 2020/11/19.
// Copyright © 2020 nalovy. All rights reserved.
//
#import "NSNumber+YQ.h"
@implementation NSNumber (YQ)
//
// NSNumberFormatterNoStyle = kCFNumberFormatterNoStyle, //无格式,四舍五入，原值2.7999999999,直接输出3
// NSNumberFormatterDecimalStyle = kCFNumberFormatterDecimalStyle, //小数型,保留小数输出2.8
// NSNumberFormatterCurrencyStyle = kCFNumberFormatterCurrencyStyle, //货币型,加上了人民币标志，原值输出￥2.8
// NSNumberFormatter
// NSNumberFormatterPercentStyle = kCFNumberFormatterPercentStyle, //百分比型,本身数值乘以100后用百分号表示,输出280%
// NSNumberFormatterScientificStyle = kCFNumberFormatterScientificStyle, //科学计数型,原值表示，输出2.799999999E0
// NSNumberFormatterSpellOutStyle = kCFNumberFormatterSpellOutStyle //全拼,原值的中文表示，输出二点七九九九...
- (NSString *)changeStyle:(NSNumberFormatterStyle)style {
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.numberStyle = style;
return [formatter stringFromNumber:self];
}
- (NSString *)changeToumberFormatterNoStyle {
return [self changeStyle:NSNumberFormatterNoStyle];
}
- (NSString *)changeToNumberFormatterDecimalStyle {
return [self changeStyle:NSNumberFormatterDecimalStyle];
}
- (NSString *)changeToNumberFormatterCurrencyStyle {
return [self changeStyle:NSNumberFormatterCurrencyStyle];
}
- (NSString *)changeToNumberFormatterPercentStyle {
return [self changeStyle:NSNumberFormatterPercentStyle];
}
- (NSString *)changeToNumberFormatterScientificStyle {
return [self changeStyle:NSNumberFormatterScientificStyle];
}
- (NSString *)changeToNumberFormatterSpellOutStyle {
return [self changeStyle:NSNumberFormatterSpellOutStyle];
}
+ (NSNumber *)getResult:(NSNumber *)one operators:(YQOPERATORS)opera num:(NSNumber *)two {
NSDecimalNumber *resultNum = [[NSDecimalNumber alloc] init];
NSDecimalNumber *A = [NSDecimalNumber decimalNumberWithDecimal:one.decimalValue];
NSDecimalNumber *B = [NSDecimalNumber decimalNumberWithDecimal:two.decimalValue];
NSDecimalNumberHandler *roundingBehavior = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain
scale:2
raiseOnExactness:NO
raiseOnOverflow:NO
raiseOnUnderflow:NO
raiseOnDivideByZero:NO];
if (opera == YQ_Add) {
resultNum = [A decimalNumberByAdding:B withBehavior:roundingBehavior];
}else if (opera == YQ_Sub) {
// 减法
resultNum = [A decimalNumberBySubtracting:B withBehavior:roundingBehavior];
}else if (opera == YQ_Mul) {
resultNum = [A decimalNumberByMultiplyingBy:B withBehavior:roundingBehavior];
}else if (opera == YQ_Div) {
// 除法
resultNum = [A decimalNumberByDividingBy:B withBehavior:roundingBehavior];
}
return resultNum;
}
@end
