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Create a detailed code implementation using the HealthKit framework in Swift (specify the version, e.g., Swift 5). The implementation should focus on tracking daily step counts and heart rate monitoring, suitable for an iOS app targeting iOS 15 and later. Include comments to explain the key parts of the code, and ensure it follows best practices for accessing and handling HealthKit data. If possible, provide a brief overview of the necessary permissions and a basic UI for displaying the tracked data.

Can you guide me on how to use SwiftUI to create a user login screen, adhering to best practices? The screen should include text fields for username and password, a login button, and adhere to accessibility and MVVM design principles. Also, include recommendations for structuring the SwiftUI view components and managing the state effectively.

Can you explain how interactive widgets function in iOS 17, particularly focusing on their design and user interaction capabilities? I'm interested in understanding how these widgets differ from earlier, non-interactive versions, and how they can be implemented in Swift using the WidgetKit framework.

Can you explain this...