怎么在SwiftUI中监听swiftdata的变化
Asked on 02/21/2025
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To listen for changes in SwiftData within a SwiftUI application, you can utilize the SwiftData history API. This API allows you to track changes such as insertions, updates, and deletions of models over time. Here's a brief overview of how you can achieve this:
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SwiftData History API: The history API in SwiftData provides a way to query and process changes in your data store. It records transactions that contain metadata about all changes, allowing you to track which models have been inserted, updated, or deleted.
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Transactions and Changes: Each transaction groups together changes that occurred in the data store, preserving the order of these changes. This is useful for updating your app's state at runtime based on the changes detected.
For more detailed information, you can refer to the session Track model changes with SwiftData history (05:18) which covers the fundamentals of using SwiftData history to track model changes.
Additionally, SwiftUI's state management tools, such as @State and @Binding, can be used to automatically update your UI when the underlying data changes. This is particularly useful when you have views that depend on data managed by SwiftData. For more on state management in SwiftUI, you can check out the session SwiftUI essentials (01:34).
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