iOS Home Activity Tracker App

I need an iOS-only app that can passively collect data about everyday activities carried out at home. The core requirement is to capture relevant sensor readings (motion, location within the device’s privacy limits, screen-time, and any other metrics you propose) and log them in a structured format that I can later analyze.

Key points
• Build for iOS 15 + using Swift or SwiftUI.
• Data to log: timestamps, basic motion data (accelerometer, gyroscope, step count), screen on/off patterns, and any additional home-related context you can reliably infer.
• All data should be stored locally first, then exportable as a CSV or JSON file via email or iCloud Drive.
• The user interface can be minimal—just start/stop collection, data export, and a short privacy statement.
• Keep battery usage low and respect Apple background-execution rules.
• Deliver Xcode project with clear comments, a one-page README explaining the data schema, and a brief guide on adding new sensors later.

I need the first workable build as soon as possible, so choose proven libraries and APIs to accelerate delivery.