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Finding the Equivalent of onReceive in iOS 17 with Observable

Discover how to transition from `onReceive` to the new Observable paradigm in iOS 17 for SwiftUI applications. Learn the best practices for state management and data binding in your apps. --- This video is based on the question https://stackoverflow.com/q/77689628/ asked by the user 'Tài Lê' ( https://stackoverflow.com/u/5421150/ ) and on the answer https://stackoverflow.com/a/77690251/ provided by the user 'workingdog support Ukraine' ( https://stackoverflow.com/u/11969817/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Method equivalent `onReceive` in iOS 17 with Observable Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Understanding the Transition: From onReceive to Observable in iOS 17 With the introduction of iOS 17, developers are faced with some changes in how to handle state updates and data binding in their SwiftUI applications. One of these changes is determining the equivalent of the onReceive method that was commonly used in earlier versions of iOS to respond to changes in observable objects. In SwiftUI before iOS 17, the onReceive method was often used in combination with ObservableObject or StateObject. This served as a great way to listen for changes in data in various scenarios, like when the root view went inactive, or when other state changes occurred. Understanding how to migrate from this approach can be crucial as project demands evolve with new updates. The Challenge: onReceive in iOS 17 As developers migrate their projects to iOS 17+, the main challenge becomes understanding what method replaces onReceive. The shift from @Observable and related constructs alters how we manage and respond to state changes. In most cases, developers may wonder if the old @Bindable property wrapper could function similarly. However, this does not always provide the same capabilities that onReceive offered. Example of Old onReceive Usage To illustrate the problem, let’s look at a simple code example used in earlier versions: [[See Video to Reveal this Text or Code Snippet]] In the snippet above, onReceive is effectively listening to changes in the number property of the ContentViewModel. But how can we achieve this in iOS 17? The Solution: New Approaches with Observable In iOS 17, you can adapt the way you listen for changes in your observables using different approaches. Here are two alternative strategies to replace onReceive: Using words.publisher You can use Swift’s Combine with publisher properties for number. This instantiates a stream of updates whenever the value changes. Here’s how to implement it: [[See Video to Reveal this Text or Code Snippet]] Using Just Another approach leverages the Just publisher from the Combine framework. This is a simple way to respond to a single value and can be used effectively when you need to listen to specific state changes. Example of using Just: [[See Video to Reveal this Text or Code Snippet]] Conclusion As you begin to transition your SwiftUI applications to accommodate the changes in iOS 17, it's clear that there are alternatives to the onReceive method that maintain functionality while leveraging the new observable patterns. Adapting to these changes may require refactoring some existing code, but the new methods offer robust ways to handle state and data flow in your applications effectively. By utilizing words.publisher or Just, developers can create responsive UIs that react seamlessly to state changes in their observables. Key Takeaways Use words.publisher or Just to replace onReceive in iOS 17. Understand how state management has evolved with the new observable paradigm. Experiment with these methods to find the best fit for your application needs. As you continue developing with SwiftUI and iOS 17, keep refining your understanding of these tools to ensure you are taking full advantage of the framework’s capabilities.