KVO query
KVO query
- Subject: KVO query
- From: Jonathan Mitchell <email@hidden>
- Date: Wed, 13 Aug 2014 22:53:29 +0100
I have a key path like so which is observed:
submission.status.name
At one point i need to invoke a manual KVO notification like so:
[submission willChangeValueForKey:@“status”];
[submission didChangeValueForKey:@“status”];
This raises like so:
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Cannot update for observer <NSKeyValueObservance 0x608000ac21b0> for the key path "status.name" from <Submission 0x6080003aa800>, most likely because the value for the key "status" has changed without an appropriate KVO notification being sent. Check the KVO-compliance of the Submission class.’
I am using manual KVO because my submission object is a wrapper around a Mono managed class.
I receive a callback that the managed status object has changed and want to propagate that via KVO.
The true situation is generic : i receive a callback that a managed property P has changed and want to raise manual KVO notifications in a compliant manner.
Is there a way for me to programatically determine what sequence of manual KVO notifications I will require to maintain KVO compliance?
I imagine that the framework code uses - observationInfo to achieve this but that is opaque to client code.
I am trying to avoid having lots of explicit +keyPathsForValuesAffectingValueForKey: methods.
Thanks
Jonathan
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