- 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.
