NSNumberFormatter是格式化NSDecimalNumber的唯一方法吗？ [英] Is NSNumberFormatter the only way to format an NSDecimalNumber?

问题描述

我使用NSDecimalNumber在Core Data中存储资金。我天真地使用stringWithFormat：首先格式化值，后来意识到它不支持NSDecimalNumber，而是格式化指针:(。所以在一些阅读完文档后，我学会使用NSNumberFormatter获得我想要的格式。

I'm using an NSDecimalNumber to store money in Core Data. I naively used stringWithFormat: at first to format the value, later realizing that it didn't support NSDecimalNumber and was instead formatting the pointer :(. So after some reading through the docs I learned to use the NSNumberFormatter to get the format I wanted. But this just strikes me as the "hard way". Is there any easier way than this:?

NSNumberFormatter * formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle: NSNumberFormatterCurrencyStyle];
priceField.text = [formatter stringFromNumber: ent.price];
[formatter release];

推荐答案

这种方法没有什么问题，到字符串。

There's nothing wrong with that approach, and it's the conventional pattern to convert opaque number classes to strings.

如果我有一个 UIView 经常使用格式化，我通常会有一个实例成员，所以我避免不必重复 alloc / init / c>格式化程序。

If I have a UIView that uses a formatter often, I'll usually have one as an instance member so I avoid having to repeatedly alloc/init/release the formatter.

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