Kvo manual notifications

 · Registering for Key-Value Observing describes the full lifecycle of registering for, receiving, and de-registering for key value observation notifications. KVO’s primary benefit is that you don’t have to implement your own scheme to send notifications every time a .  · Manual change notification provides additional control over when notifications are emitted, and requires additional coding. You can control automatic notifications for properties of your subclass by implementing the class method automaticallyNotifiesObserversForKey. Automatic Change Notification.  · The class must be key-value coding compliant for the property, as specified in “ Ensuring KVC Compliance ”. KVO supports the same data types as KVC. The class emits KVO change notifications for the property. Dependent keys are registered appropriately (see “ Registering Dependent Keys ”). There are two techniques for ensuring the change.

The manual or automatic call to -didChange will trigger the KVO notification to be sent out. Hence, we must be very careful about not making changes to properties from another thread unless we can be sure that everybody observing that key can handle the change notification in a thread-safe manner. Manual change notification provides additional control over when notifications are emitted, and requires additional coding. You can control automatic notifications for properties of your subclass by implementing the class method automaticallyNotifiesObserversForKey. Automatic Change Notification. And yes, I did try to dispatch the manual KVO notification to the main thread, but that results in a complete lock in the UI. EDIT: I changed the dataLoaded property to not use a different getter, removing the need for manual KVO. However, there is still a crash now when trying to set the property.

Refer to alerts, alarms and troubleshooting section for further information. Indications to change a battery. Average battery life is approximately three to. 5 ene We register a function with the notification center that gets called is deallocated)? The new KeyPath -based KVO API works like this. If you're using Core Data, you can register the parent with the application's notification center as an observer of its managed object context.