从另一个方法访问时目标 c 丢失 NSDecimalNumber 值
我正在将 Json 数据解析为 NSDecimalNumber，如下所示。
product.Price = [NSDecimalNumber decimalNumberWithDecimal:[[jProduct
objectForKey:@"Price"] decimalValue]];
这是一个循环，每个产品都被添加到数组中。最后我释放了 json 对象。
如果我在循环期间记录 Product.Price 的值，则该值是正确的。然而，在应用程序生命周期的后期，我访问了数组中的一个产品，然后我得到了EXC_BAD_ACCESS。
这是指向随后被释放的 json 数据的一些奇怪的指针问题吗？有什么想法吗？值得注意的是，我的 NSIntegers 和 NSStrings 的值都很好。
I am parsing Json Data into an NSDecimalNumber as follows
product.Price = [NSDecimalNumber decimalNumberWithDecimal:[[jProduct
objectForKey:@"Price"] decimalValue]];
This is in a loop with each product being added to an array. At the end I release the json object.
If I Log the value of product.Price during the loop the value is correct. However later on the the application lifecycle I access a product in the array and bang, I get EXC_BAD_ACCESS.
is this some odd pointer issue back to the json data which is then being released? any ideas? It's worth noting that the values of my NSIntegers and NSStrings are fine.
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您没有显示所有相关代码，但我的猜测是
Price属性的定义（应该以小写字母开头，顺便说一句）没有retain关键字。结果是[NSDecimalNumber DecimalNumberWithDecimal:...]中的自动释放对象只是自动释放:-) 然后你的指针指向无效内存。该属性的声明应与此类似：
如果缺少
retain关键字，则仅存储指针，但该属性不会增加保留计数（告诉对象：我需要你留下来直到我和你说完）。You didn't show all the relevant code, but my guess is that the definition of the
Priceproperty (which should start with a lower case letter, BTW) does not have theretainkeyword. The result is that the autoreleased object from[NSDecimalNumber decimalNumberWithDecimal:...]simply gets autoreleased :-) And then your pointer is pointing to invalid memory.The property should be declared similar to this:
If the
retainkeyword is missing then only the pointer will be stored, but the property will not increase the retain count (tell the object: I'll need you to stay around until I'm done with you).