iOS NSNumberFormatter

原文地址

• 补充

NSNumberFormatter *numberFormatter = [NSNumberFormatter new];
numberFormatter.numberStyle = NSNumberFormatterDecimalStyle;
numberFormatter.multiplier = @1000;
NSLog(@"%@千",[numberFormatter numberFromString:@"1000"]);  // 1千
NSLog(@"%@千",[numberFormatter stringFromNumber:@0.001]);  // 1千    

关于multiplier（缩放因子）的说明：当 numberFormatter 接收的是 NSNumber 类型时，最终的结果为：number * multiplier，当接收的是 NSString 类型时，结果为：string / multiplier。

• 官方文档：

A multiplier is a factor used in conversions between numbers and 
strings (that is, numbers as stored and numbers as displayed). 
When the input value is a string, the multiplier is used to divide, 
and when the input value is a number, the multiplier is used to 
multiply. These operations allow the formatted values to be 
different from the values that a program manipulates internally.