Regarding "Ensuring KVO Compliance", there are some official definition which seem like hard to understand

In order to be considered KVO-compliant for a specific property, a class must ensure the following;

  1. The class must be key-value coding compliant for the property as specified in Ensuring KVC Compliance.

  2. The class must allow automatic observer notifications for the property, or implement manual key-value observing for the property.

Who can give more specific examples to make this more clear ? Thanks

ios key-value-observing
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