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# identifier

An identifier that specifies a complication if your app supports multiple complications per family.

```
var identifier: String { get }
```

## Discussion

In watchOS 7 and later, ClockKit represents a complication by its [`family`](/documentation/ClockKit/CLKComplication/family) and its [`CLKComplicationDescriptor`](/documentation/ClockKit/CLKComplicationDescriptor). Descriptors often represent categories of information that the complication can display. For example, a weather app may support `Condition`, `Temperature`, and `Precipitation` descriptors.

```swift
let ComplicationConditionIdentifier = "ComplicationTypeCondition"
let ComplicationTemperatureIdentifier = "ComplicationTypeTemperature"
let ComplicationPrecipitationPercentageIdentifier = "ComplicationTypePrecipitationPercentage"
```

For apps created for watchOS 6 or earlier, the system automatically sets the configuration’s [`identifier`](/documentation/ClockKit/CLKComplication/identifier) property to [`CLKDefaultComplicationIdentifier`](/documentation/ClockKit/CLKDefaultComplicationIdentifier) if you don’t implement your data source’s [`getComplicationDescriptors(handler:)`](/documentation/ClockKit/CLKComplicationDataSource/getComplicationDescriptors(handler:)) method. Similarly, the system sets the identifier to [`CLKDefaultComplicationIdentifier`](/documentation/ClockKit/CLKDefaultComplicationIdentifier) if the complication came from a shared watch face, but the sender chose to exclude private information.

Because default identifiers can come from shared watch faces, your data source’s [`getCurrentTimelineEntry(for:withHandler:)`](/documentation/ClockKit/CLKComplicationDataSource/getCurrentTimelineEntry(for:withHandler:)) and [`getTimelineEntries(for:after:limit:withHandler:)`](/documentation/ClockKit/CLKComplicationDataSource/getTimelineEntries(for:after:limit:withHandler:)) methods must check for the [`CLKDefaultComplicationIdentifier`](/documentation/ClockKit/CLKDefaultComplicationIdentifier) value, and provide generic complication entries when it occurs.

---

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