SwiftData ResultsObserver: A Practical Example (iOS 27)

You've got SwiftData models updating. Your SwiftUI views refresh automatically. But what about code outside views — like dashboard stores, analytics, or summary calculators?

iOS 27 solves this with ResultsObserver.

What's covered:

• What ResultsObserver does (and why it matters)
• Observing model changes outside SwiftUI views
• Building a BudgetSummaryStore that reacts to data changes
• Using withContinuousObservation for live updates
• Calculating aggregates (totals, sums, remaining) automatically

Real example: Budget dashboard where total budget, amount spent, and remaining update live as the user adds or modifies expenses.