ios - 代码 : CoreData generated property is "double" instead of "NSNumber"

Question

我在使用 CoreData 时遇到问题:数据模型有多个类型为 Double 的字段:

因此，我希望生成的 CoreData 属性属于同一类型，但是，它们不是:

@property (nullable, nonatomic, copy) NSNumber *amount;
@property (nonatomic) double iccsMaterialAmountIfDifferentThanPlanItem;

这种行为的根本原因是什么，是错误吗？如果是，如何解决？

Answer 1

这是 Xcode 自动生成类的默认行为，您可以在属性上选择 Use scalar type 来更改它:

来自doc :

Use Scalar Type Optionally, for some types, choose between scalar and non-scalar representations during code generation. For a Double, selecting the Use Scalar checkbox produces a Double, while leaving it unselected produces an NSNumber. For the full list of types, including scalar variants, see NSAttributeType.