Generic Instance Method
Sets the key/value data for the specified dispatch queue.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Xcode 9.0+
The key that you use to identify the data.
The data you want to associate with the queue.
Getting and Setting Contextual Data
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