试图在蜡中创建诚实的NSDecimalNumber [英] Trying to create honest NSDecimalNumber in Wax

问题描述

当我研究我在中遇到的问题时，尝试在iPhone中创建NSDecimal - 蜡我现在的目标低得多。如何在Wax中创建一个完全功能的NSDecimalNumber？

我在AppDelegate.lua的顶部在一个新的蜡项目中添加了以下两行。

  local x = NSDecimalNumber：initWithString（2.3）
 print（x）
 print ）
  

输出为

 （0x631e054 => 0x631d1a0）2.3 
（0x631e924 => 0x25f618）NSCFNumber 
  

b $ b

而不是像

 （0x621e834 => 0x620c550）< NSDecimalNumber：0x620c550& 
 

打开完整日志记录，在调试窗口中提供以下跟踪：

为WaxServer创建类（0x621bf40）
将引用存储到userdata表WaxServer（0x621bf40 - > 0x621c454）
存储引用到强用户数据表WaxServer（0x621bf40 - > 0x621c454）
为NSDecimalNumber（0x261120）创建类
将类引用存储到userdata表NSDecimalNumber（0x261120 - > 0x6205e44）
存储引用到strong userdata table NSDecimalNumber（0x261120 - > 0x6205e44）
为NSDecimalNumberPlaceholder创建实例（0x6213450）
为NSDecimalNumberPlaceholder保留实例（0x6213450 - > 0x621d7c4）
将实例引用存储到userdata表NSDecimalNumberPlaceholder（0x6213450 - > 0x621d7c4）
存储对强用户数据表的引用NSDecimalNumberPlaceholder（0x6213450 - > 0x621d7c4）
为NSCFNumber创建实例（0x620c550）
保留NSCFNumber的实例（0x620c550 - > 0x621e834）
将实例的引用存储到userdata表NSCFNumber（0x620c550 - > 0x621e834）
存储对strong userdata表的引用NSCFNumber（0x620c550 - > 0x621e834）
（0x621e834 => 0x620c550） 2.3
为AppDelegate创建类（0x621ec50）
：
：


两个东西都显示在这个日志中，我没有要求，NSDecimalNumberPlaceholder和NSCFNumber。我相信这些是我悲伤的根源，我不知道他们来自哪里。关于如何解决这个问题的任何想法？

最后，我想调用的方法decimalValue，但蜡抱怨，它不能调用一个数字上的方法。 p>

解决方案

NSDecimalNumber覆盖 -description ，返回它所代表的数字。当你日志语句正在打印2.3时，它实际上是打印NSDecimalNumber对象。您可以通过在 x 值上调用 -class 并打印该值来自行验证。

As I studied the issue I am facing in Trying to create NSDecimal in iPhone-Wax I am now aiming much lower. How can I create a fully functional NSDecimalNumber in Wax?

I have added the following two lines at the top of AppDelegate.lua in a fresh wax project.

local x = NSDecimalNumber:initWithString("2.3")
print(x)
print(x:class())

The output is

(0x631e054 => 0x631d1a0) 2.3
(0x631e924 => 0x25f618) NSCFNumber

instead of something like

(0x621e834 => 0x620c550) <NSDecimalNumber: 0x620c550>

Turning on full logging in wax give the following trace in the debug window:

Creating class for WaxServer(0x621bf40)
Storing reference of class to userdata table WaxServer(0x621bf40 -> 0x621c454)
Storing reference to strong userdata table WaxServer(0x621bf40 -> 0x621c454)
Creating class for NSDecimalNumber(0x261120)
Storing reference of class to userdata table NSDecimalNumber(0x261120 -> 0x6205e44)
Storing reference to strong userdata table NSDecimalNumber(0x261120 -> 0x6205e44)
Creating instance for NSDecimalNumberPlaceholder(0x6213450)
Retaining instance for NSDecimalNumberPlaceholder(0x6213450 -> 0x621d7c4)
Storing reference of instance to userdata table NSDecimalNumberPlaceholder(0x6213450 -> 0x621d7c4)
Storing reference to strong userdata table NSDecimalNumberPlaceholder(0x6213450 -> 0x621d7c4)
Creating instance for NSCFNumber(0x620c550)
Retaining instance for NSCFNumber(0x620c550 -> 0x621e834)
Storing reference of instance to userdata table NSCFNumber(0x620c550 -> 0x621e834)
Storing reference to strong userdata table NSCFNumber(0x620c550 -> 0x621e834)
(0x621e834 => 0x620c550) 2.3
Creating class for AppDelegate(0x621ec50)
:
:

Two things are showing in this log which I did not ask for, NSDecimalNumberPlaceholder and NSCFNumber. I believe these are the source of my grief and I have no idea where they are coming from. Any ideas on how to fix the issue?

Ultimately I want to call the method decimalValue, but wax complains that it can't call a method on a number.

解决方案

NSDecimalNumber overrides -description to return the number it represents. When you're logging statement is printing "2.3", it is in fact printing the NSDecimalNumber object. You can verify this for yourself by calling -class on your x value and printing that as well.

这篇关于试图在蜡中创建诚实的NSDecimalNumber的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！