观察NSManagedObject属性的变化：如何避免循环？ [英] Observing changes in the properties of an NSManagedObject: how to avoid looping?

问题描述

在我的应用程序中，我观察被管对象的属性。更改可能导致对其某些其他属性的调整，因此受管对象本身会接收到已更改属性的消息。这些更改通过在Interface Builder中设置的绑定实现。

In my application, I observe the properties of a managed object. A change may lead to adjustments in some of its other properties, so the managed object itself receives a message of a changed property. These changes happen through bindings that are set up in the Interface Builder.

我在托管对象的实现中有以下方法：

I have the following method in the implementation of the managed object:

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if ( !processingChange )
    {
        processingChange = YES;

        *** DO STUFF TO THIS MANAGED OBJECT'S PROPERTIES ***

        [self.managedObjectContext processPendingChanges];

        processingChange = NO;
        return;
    }
}

processingChange boolean是为了避免一个无尽的通知循环，但它不工作，因为我期望（加上它看起来像一个真正的脏黑客）。

The processingChange boolean is there to avoid an endless "notification loop", but it is not working as I expect (plus it looks like a real dirty hack).

必须有另一种方法来做到这一点。任何建议？

There must be another way to do this. Any suggestions?

推荐答案

使用MOMs setPrimitiveValue：forKey：生成KVO

use MOMs' setPrimitiveValue:forKey: it doesnt generate KVOs

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