四舍五入保留三位小数
double RV5SV1AmpTmV =[ self roundFloat:CGFloatSV1+CGFloatRV5 ];
// 四舍五入保留三位小数
#pragma mark - 四舍五入保留三位小数
-(float)roundFloat:(float)price{
NSString *temp = [NSString stringWithFormat:@"%.7f",price];
NSDecimalNumber *numResult = [NSDecimalNumber decimalNumberWithString:temp];
NSDecimalNumberHandler *roundUp = [NSDecimalNumberHandler
decimalNumberHandlerWithRoundingMode:NSRoundBankers
scale:3
raiseOnExactness:NO
raiseOnOverflow:NO
raiseOnUnderflow:NO
raiseOnDivideByZero:YES];
return [[numResult decimalNumberByRoundingAccordingToBehavior:roundUp] floatValue];