Executes a provided block with the fetched values for the given item properties.
- iOS 4.0+
- watchOS 2.0+
- Media Player
A set of property keys that you want the values for.
A block object that executes for each fetched property value. If a value is not available, your block is sent
Use this method to get property values in a batch fashion. Anytime the app accesses more than one property, enumerating over a set of property keys is more efficient than fetching each individual property with
The media property keys you can use with this property are listed in this document and in General Media Item Property Keys, Podcast Item Property Keys, Playlist Property Keys, and User-Defined Property Keys.