SpeziHealthKit

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HealthKit module of the Stanford Spezi framework

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# Spezi HealthKit

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Access Health data in your Spezi app.

## Overview

The Spezi HealthKit module enables apps to integrate with Apple's HealthKit system, fetch data, set up long-lived background data collection, and visualize Health-related data.

### Setup

You need to add the Spezi HealthKit Swift package to
[your app in Xcode](https://developer.apple.com/documentation/xcode/adding-package-dependencies-to-your-app) or
[Swift package](https://developer.apple.com/documentation/xcode/creating-a-standalone-swift-package-with-xcode#Add-a-dependency-on-another-Swift-package).

> [!IMPORTANT]  
> If your application is not yet configured to use Spezi, follow the [Spezi setup article](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/initial-setup) to set up the core Spezi infrastructure.

### Health Data Collection

Before you configure the [`HealthKit`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkit/healthkit-swift.class)  module, make sure your `Standard` in your Spezi Application conforms to the [`HealthKitConstraint`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkit/healthkitconstraint) protocol to receive HealthKit data.
The [`HealthKitConstraint/handleNewSamples(_:ofType:)`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkit/healthkitconstraint/handleNewSamples(_:ofType:)) function is called once for every batch of newly collected HealthKit samples, and the [`HealthKitConstraint/handleDeletedObjects(_:ofType:)`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkit/healthkitconstraint/handleDeletedObjects(_:ofType:)) function is called once for every batch of deleted HealthKit objects.
```swift
actor ExampleStandard: Standard, HealthKitConstraint {
    // Add the newly collected HealthKit samples to your application.
    func handleNewSamples<Sample>(
        _ addedSamples: some Collection<Sample> & Sendable,
        ofType sampleType: SampleType<Sample>
    ) async {
        // ...
    }

// Remove the deleted HealthKit objects from your application.
    func handleDeletedObjects<Sample>(
        _ deletedObjects: some Collection<HKDeletedObject> & Sendable,
        ofType sampleType: SampleType<Sample>
    ) async {
        // ...
    }
}
```

Then, you can configure the [`HealthKit`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkit/healthkit-swift.class) module in the configuration section of your `SpeziAppDelegate`.
You can, e.g., use [`CollectSamples`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkit/collectsamples) to collect a wide variety of HealthKit data types:
```swift
class ExampleAppDelegate: SpeziAppDelegate {
    override var configuration: Configuration {
        Configuration(standard: ExampleStandard()) {
            HealthKit {
                CollectSamples(.activeEnergyBurned)
                CollectSamples(.stepCount, start: .manual)
                CollectSamples(.pushCount, start: .manual)
                CollectSamples(.heartRate, continueInBackground: true)
                CollectSamples(.electrocardiogram, start: .manual)
                RequestReadAccess(quantity: [.bloodOxygen])
            }
        }
    }
}
```

> [!TIP]
> See [`SampleType`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkit/sampletype) for a complete list of supported sample types.

### Querying Health Data in SwiftUI

You can use [`SpeziHealthKitUI`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkitui)'s [`HealthKitQuery`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkitui/healthkitquery) and [`HealthKitStatisticsQuery`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkitui/healthkitstatisticsquery) property wrappers to access the Health database in a View:
```swift
struct ExampleView: View {
    @HealthKitQuery(.heartRate, timeRange: .today)
    private var heartRateSamples

var body: some View {
        ForEach(heartRateSamples) { sample in
            // ...
        }
    }
}
```

Additionally, you can use [`SpeziHealthKitUI`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkitui)'s [`HealthChart`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkitui/healthchart) to visualise query results:
```swift
struct ExampleView: View {
    @HealthKitQuery(.heartRate, timeRange: .today)
    private var heartRateSamples

var body: some View {
        HealthChart {
            HealthChartEntry($heartRateSamples, drawingConfig: .init(mode: .line, color: .red))
        }
    }
}
```

For more information, please refer to the [API documentation](https://swiftpackageindex.com/StanfordSpezi/SpeziHealthKit/documentation).

## The Spezi Template Application

The [Spezi Template Application](https://github.com/StanfordSpezi/SpeziTemplateApplication) provides a great starting point and example using the [`SpeziHealthKit`](https://swiftpackageindex.com/stanfordspezi/spezihealthkit/documentation/spezihealthkit) module.

## Contributing

Contributions to this project are welcome. Please make sure to read the [contribution guidelines](https://github.com/StanfordSpezi/.github/blob/main/CONTRIBUTING.md) and the [contributor covenant code of conduct](https://github.com/StanfordSpezi/.github/blob/main/CODE_OF_CONDUCT.md) first.

## License

This project is licensed under the MIT License. See [Licenses](https://github.com/StanfordSpezi/SpeziHealthKit/tree/main/LICENSES) for more information.

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SpeziHealthKit

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