核心数据布尔属性NSNumber不记得它的布尔值 [英] Core Data Boolean property NSNumber doesn't remember it's boolean

问题描述

我有一个具有如下属性的模型：

I have a model with a property that looks like this:

当我设置其值时，例如：

When I set its value, for example:

model.isResolved = @YES;

保存在模型中的NSNumberforgets是一个布尔值：

The NSNumber that's kept inside the model "forgets" that it's a boolean:

NSLog(@"%@", strcmp([self.isResolved objCType], @encode(BOOL)) == 0 ? @"equal" : @"different");

打印不同。

推荐答案

这是什么？

What is up with that?

从文档：

请注意，数字对象不一定保存它们创建的类型。

Note that number objects do not necessarily preserve the type they are created with.

这是Cocoa中另一个不一致的优化。

That's another inconsistency-for-optimization in Cocoa.

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