NSDecimalNumber--十进制数 iOS提供的一种支持准确精度计算的数据类型 NSDecimalNumber. +(NSDecimalNumber *)zero; //0 +(NSDecimalNumber *)one; //1 +(NSDecimalNumber *)minimumDecimalNumber 逻辑运算 加法运算 -(NSDecimalNumber *)decimalNumberByAdding:(NSDecimalNumber *)decimalNumber; -(NSDecimalNumber *discount1 = [NSDecimalNumber decimalNumberWithString:@"1.2"]; NSDecimalNumber *discount2 = [NSDecimalNumber # NSDecimal 与 NSDecimalNumber 之间的转化 NSDecimalNumber *price = [NSDecimalNumber decimalNumberWithString
负责计算表达式的工具类 see also 前言 效果图 背景 之前使用NSExpression 进行表达式的计算,发现一个问题:无法精准小数点位数(1+65 和65+1 的精度就不一样) 解决方案:采用的是NSDecimalNumber 进行计算 NSDecimalNumber NSDecimalNumber* computeResult = [MSParser parserComputeNumberExpression:floatString NSDecimal desDecimal; NSDecimalRound(&desDecimal, &decimal , 2, NSRoundPlain); result = [[NSDecimalNumber stringWithFormat:@"1.0*%@", sanitizedString];//1.0*1+1+9/8 NSString * result = nil; NSDecimalNumber NSDecimal desDecimal; NSDecimalRound(&desDecimal, &decimal , 2, NSRoundPlain); result = [[NSDecimalNumber
4.使用NSDecimalNumber进行累加计算时出现了崩溃 不可写成,需要一个中间变量做周转,而且 initWithString:@"0"是需要设置的,不能光 init allMoney = [allMoney decimalNumberByAdding:money]; 最后的代码是这样的: NSDecimalNumber *allMoney = [[NSDecimalNumber alloc]initWithString :@"0"]; for (ExpensesModel *model in dataArray) { NSDecimalNumber *allMoney11 =[[NSDecimalNumber alloc]initWithString:[allMoney stringValue]]; NSDecimalNumber *money = [[NSDecimalNumber alloc]initWithString
:(int)position { NSString *doubleString = [NSString stringWithFormat:@"%lf", value]; NSDecimalNumber *decNumber = [NSDecimalNumber decimalNumberWithString:doubleString]; NSString *decStr = [decNumber
// 12.75 subtotal NSDecimalNumber *subtotalAmount = [NSDecimalNumber decimalNumberWithMantissa:1275 exponent = [PKPaymentSummaryItem summaryItemWithLabel:@"Subtotal" amount:subtotalAmount]; // 2.00 discount NSDecimalNumber *discountAmount = [NSDecimalNumber decimalNumberWithMantissa:200 exponent:-2 isNegative:YES]; self.discount = [PKPaymentSummaryItem summaryItemWithLabel:@"Discount" amount:discountAmount]; 汇总项使用 NSDecimalNumber // 10.75 grand total NSDecimalNumber *totalAmount = [NSDecimalNumber zero]; totalAmount = [totalAmount
summaryItemWithLabel:@"鸡蛋" amount:[NSDecimalNumber summaryItemWithLabel:@"苹果" amount:[NSDecimalNumber summaryItemWithLabel:@"2个苹果" amount:[NSDecimalNumber PKPaymentSummaryItem *widget4 = [PKPaymentSummaryItem summaryItemWithLabel:@"总金额" amount:[NSDecimalNumber
这里有两种实现方案:1、contentInset.top 取整let firstNum = NSDecimalNumber(string: "1.1")let secondNum = NSDecimalNumber string: "1.1")let resultNum = firstNum.multiplying(by: secondNum)let numberEqual = resultNum.compare(NSDecimalNumber fabs(streamRatio - QNBUALiveShowPlayerDefaultAspectRatio) < FLT_EPSILON;```3、`contentOffset.y` 判等时 使用 `NSDecimalNumber
//空发货地址 payRequest.shippingMethods = @[]; //设置配送方式 NSDecimalNumber *totalAmount = \ [NSDecimalNumber decimalNumberWithString:@"0.01"];
1、NSDecimalNumber转基础数据类型时选择 double 比 float 更精确 2、一个奇怪的 Duplicate interface definition for class 错误 完成以下措施后依然无效
//兼容的对象属性 allowedJSONTypes = @[ [NSString class], [NSNumber class], [NSDecimalNumber