Instance Property

operationQueue

The queue on which query result notifications are posted.

Declaration

var operationQueue: OperationQueue? { get set }

Discussion

Use this property to decouple the processing of results from the thread used to execute the query. This makes it easier to synchronize query result processing with other related operations—such as updating the data model or user interface—which you might want to perform on the main queue.

See Also

Getting Query Results

var results: [Any]

An array containing the query’s results.

var resultCount: Int

The number of results returned by the query. (read-only)

func result(at: Int)

Returns the query result at a specific index.

func index(ofResult: Any)

Returns the index of a query result object in the receiver’s results array.

var groupedResults: [NSMetadataQueryResultGroup]

An array containing hierarchical groups of query results. (read-only)

class NSMetadataQueryResultGroup

The NSMetadataQueryResultGroup class represents a collection of grouped attribute results returned by an NSMetadataQuery object.

func enumerateResults((Any, Int, UnsafeMutablePointer<ObjCBool>) -> Void)

Enumerates the current set of results using the given block.

var valueLists: [String : [NSMetadataQueryAttributeValueTuple]]

A dictionary containing the value lists generated by the query.

class NSMetadataQueryAttributeValueTuple

The NSMetadataQueryAttributeValueTuple class represents attribute-value tuples, which are objects that contain the attribute name and value of a metadata attribute.

func value(ofAttribute: String, forResultAt: Int)

Returns the value for the attribute name attrName at the index in the results specified by idx.

func enableUpdates()

Enables updates to the query results.

func disableUpdates()

Disables updates to the query results.