-(NSString *)notRounding:(float)price 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:price];

roundedOunces = [ouncesDecimal decimalNumberByRoundingAccordingToBehavior:roundingBehavior];

[ouncesDecimal release];

return [NSString stringWithFormat:@"%@",roundedOunces];

}

介紹一下參數(shù)：

price:需要處理的數(shù)字，

position：保留小數(shù)點(diǎn)第幾位，

然后調(diào)用

floats =0.126;NSString*sb = [selfnotRounding:s afterPoint:2];NSLog(@"sb = %@",sb);

輸出結(jié)果為：sb = 0.12

接下來(lái)介紹NSDecimalNumberHandler初始化時(shí)的關(guān)鍵參數(shù)：decimalNumberHandlerWithRoundingMode：NSRoundDown，

NSRoundDown代表的就是只舍不入。

scale的參數(shù)position代表保留小數(shù)點(diǎn)后幾位。