fetch(_:)
Fetches the samples that a fetch request specifies.
Declaration
func fetch(_ request: SRFetchRequest)Parameters
- request:
An object that describes the device from which to retrieve samples, and samaple age of interest.
Discussion
An app calls this function to access data for the caller’s sensor.
Upon success, the framework delivers results in the form of samples via the delegate’s sensorReader(_:fetching:didFetchResult:) callback. The framework invokes the delegate multiple times if this function results in multiple samples.
The framework returns sensor data only for the argument fetch-object’s device, and that’s dated only within the argument fetch-object’s time window. Within that window, this function returns only the data that the framework recorded (see startRecording()), and that the framework hasn’t deleted (see SRDeletionRecord).