CBLCollectionChange
@interface CBLCollectionChange : NSObjectThe collection change event
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                  The IDs of the document that changed. DeclarationObjective-C @property (nonatomic, readonly) NSArray<NSString *> *_Nonnull documentIDs;
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                  Collection. DeclarationObjective-C @property (nonatomic, readonly) CBLCollection *_Nonnull collection;
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                  Unavailable Not available DeclarationObjective-C - (nonnull instancetype)init;
 CBLCollectionChange Class Reference
        CBLCollectionChange Class Reference