- 浮點型轉(zhuǎn)字符串 金融遇到只保留小數(shù)位不進行四舍五入的時候
//浮點型轉(zhuǎn)字符串,不進行四舍五入 參數(shù):浮點型數(shù)值,保留的小數(shù)位數(shù)
+(NSString *)notRounding:(double)dValue afterPoint:(int)position{
NSDecimalNumberHandler* roundingBehavior = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundDown scale:position raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:NO];
NSDecimalNumber *ouncesDecimal;
NSDecimalNumber *roundedOunces;
ouncesDecimal = [[NSDecimalNumber alloc] initWithFloat:dValue];
roundedOunces = [ouncesDecimal decimalNumberByRoundingAccordingToBehavior:roundingBehavior];
return [NSString stringWithFormat:@"%@",roundedOunces];
}
2.字符串轉(zhuǎn)浮點型 floatValue,doubleValue 造成的實際偏差
解決辦法,下面兩個分類,nsdecimal對象
.h文件
//
// NSDecimalNumber+Addtion.h
// 有應用應用
//
// Created by xuliying on 15/10/15.
// Copyright (c) 2015年 xly. All rights reserved.
//
import <Foundation/Foundation.h>
typedef NS_ENUM(NSInteger, type) {
Add,
subtract,
multiply,
divide
};
@interface NSDecimalNumber (Addtion)
+(NSDecimalNumber *)aDecimalNumberWithString:(NSString *)num1 type:(type)type anotherDecimalNumberWithString:(NSString *)num2;
+(NSComparisonResult)aDecimalNumberWithString:(NSString *)num1 compareAnotherDecimalNumberWithString:(NSString *)num2;
+(NSDecimalNumber *)aDecimalNumberWithNumber:(NSNumber *)num1 type:(type)type anotherDecimalNumberWithNumber:(NSNumber *)num2;
+(NSComparisonResult)aDecimalNumberWithNumber:(NSNumber *)num1 compareAnotherDecimalNumberWithNumber:(NSNumber *)num2;
@end
.m文件
//
// NSDecimalNumber+Addtion.m
// 有應用應用
//
// Created by xuliying on 15/10/15.
// Copyright (c) 2015年 xly. All rights reserved.
//
import "NSDecimalNumber+Addtion.h"
@implementation NSDecimalNumber (Addtion)
+(NSDecimalNumber *)aDecimalNumberWithString:(NSString *)num1 type:(type)type anotherDecimalNumberWithString:(NSString *)num2{
if (type == Add) {
return [[NSDecimalNumber decimalNumberWithString:num1] decimalNumberByAdding:[NSDecimalNumber decimalNumberWithString:num2]];
}else if (type == subtract){
return [[NSDecimalNumber decimalNumberWithString:num1] decimalNumberBySubtracting:[NSDecimalNumber decimalNumberWithString:num2]];
}else if (type == multiply){
return [[NSDecimalNumber decimalNumberWithString:num1] decimalNumberByMultiplyingBy:[NSDecimalNumber decimalNumberWithString:num2]];
}else if (type == divide){
return [[NSDecimalNumber decimalNumberWithString:num1] decimalNumberByDividingBy:[NSDecimalNumber decimalNumberWithString:num2]];
}else{
return nil;
}
}
+(NSComparisonResult)aDecimalNumberWithString:(NSString *)num1 compareAnotherDecimalNumberWithString:(NSString *)num2{
return [[NSDecimalNumber decimalNumberWithString:num1] compare:[NSDecimalNumber decimalNumberWithString:num2]];
}
+(NSDecimalNumber *)aDecimalNumberWithNumber:(NSNumber *)num1 type:(type)type anotherDecimalNumberWithNumber:(NSNumber *)num2{
if (type == Add) {
return [[NSDecimalNumber decimalNumberWithDecimal:[num1 decimalValue]] decimalNumberByAdding:[NSDecimalNumber decimalNumberWithDecimal:[num2 decimalValue]]];
}else if (type == subtract){
return [[NSDecimalNumber decimalNumberWithDecimal:[num1 decimalValue]] decimalNumberBySubtracting:[NSDecimalNumber decimalNumberWithDecimal:[num2 decimalValue]]];
}else if (type == multiply){
return [[NSDecimalNumber decimalNumberWithDecimal:[num1 decimalValue]] decimalNumberByMultiplyingBy:[NSDecimalNumber decimalNumberWithDecimal:[num2 decimalValue]]];
}else if (type == divide){
return [[NSDecimalNumber decimalNumberWithDecimal:[num1 decimalValue]] decimalNumberByDividingBy:[NSDecimalNumber decimalNumberWithDecimal:[num2 decimalValue]]];
}else{
return nil;
}
}
+(NSComparisonResult)aDecimalNumberWithNumber:(NSNumber *)num1 compareAnotherDecimalNumberWithNumber:(NSNumber *)num2{
return [[NSDecimalNumber decimalNumberWithDecimal:[num1 decimalValue]] compare:[NSDecimalNumber decimalNumberWithDecimal:[num2 decimalValue]]];
}
@end
