功能不多說了，直接上代碼：
-(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];
}
參數(shù)解釋如下：
price:需要處理的數(shù)字，
position：保留小數(shù)點(diǎn)第幾位肝陪，
然后調(diào)用
float s =0.126;
NSString *sb = [self notRounding:s afterPoint:2];
NSLog(@"sb = %@",sb);
輸出結(jié)果為：sb = 0.12
接下來介紹NSDecimalNumberHandler初始化時的關(guān)鍵參數(shù)：decimalNumberHandlerWithRoundingMode：NSRoundDown刑顺，
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)后幾位蹲堂。
以下是oc中直接存在的函數(shù)：
-向上取整:ceil(x),返回不小于x的最小整數(shù);
-向下取整:floor(x),返回不大于x的最大整數(shù);
-四舍五入:round(x)
-截尾取整函數(shù):trunc(x)
