更改NSManagedObject属性而不触发委托方法？ [英] Change NSManagedObject property without triggering delegate methods?

问题描述

有没有任何方法（或技巧），我可以修改目前由委托 NSFetchedResultsController 持有的 NSManagedObject 触发 didChangeObject：和 controllerWillChangeContent：委托方法？

Is there any way (or tricks) where I can modify an NSManagedObject currently held by a delegated NSFetchedResultsController without triggering the didChangeObject: and controllerWillChangeContent: delegate methods?

例如，current如果我改变 myObject.property = @hello; ，触发委托方法并更新我的表视图，但我不希望这种情况发生，但只是对于明确指定的某些更改，而不是所有更改。

For example, current if I change myObject.property = @"hello";, the delegate methods are triggered and updates are made to my table view, but I don't want that to happen, but only for certain changes where I explicitly specify, not all changes.

推荐答案

中的 setPrimitiveValue：forKey： > NSManagedObject 正是这样，例如

The setPrimitiveValue:forKey: method from NSManagedObject does exactly this, e.g.

[myObject setPrimitiveValue:@"hello" forKey:@"property"]

，或使用动态生成的访问器方法：

or, using the dynamically generated accessor methods:

[myObject setPrimitiveProperty:@"hello"]

但您应该阅读文档，因为有一些特殊注意事项。

But you should read the documentation of that method, because there are some "Special Considerations".

不同的方法可以是创建嵌套的受管对象上下文，并对该上下文进行所有修改。仅当保存子上下文时，更改才会传播到父上下文。

A different approach could be to create a "nested managed object context" and do all the modifications on that child context. Only when the child context is saved, the changes are propagated to the parent context.

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