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Understanding the ObservedObject Error in SwiftUI

Learn why you are encountering the `ObservedObject` error in SwiftUI and discover the solution to fix it easily. --- This video is based on the question https://stackoverflow.com/q/67392094/ asked by the user 'jonthornham' ( https://stackoverflow.com/u/4441627/ ) and on the answer https://stackoverflow.com/a/67392214/ provided by the user 'davidev' ( https://stackoverflow.com/u/11878069/ ) 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: Generic Struct 'ObservedObject' Requires That Conform To 'ObservableObject 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 ObservedObject Error in SwiftUI: A Simple Guide If you're a SwiftUI enthusiast or developer, you might have run into the frustrating error regarding the ObservedObject protocol and its requirements. This particular error commonly arises when trying to observe properties in your code correctly. Let’s unravel this issue, so you don’t have to feel stuck anymore! The Problem: Error with ObservedObject You created two classes in SwiftUI, where the second class is designed to observe the first. However, when compiling the code, you encounter the following error: [[See Video to Reveal this Text or Code Snippet]] This error can be quite perplexing, especially when you believe that your classes conform correctly to ObservableObject. Let's break down what's happening here. Your Class Structures You have the following two classes: First Class - BLEPeripheralDevice: [[See Video to Reveal this Text or Code Snippet]] Second Class - BLEManager: [[See Video to Reveal this Text or Code Snippet]] In the BLEManager class, you're trying to create an @ ObservedObject property for the BLEPeripheralDevice. That’s where the issue lies. Solution: Use @ Published Instead of @ ObservedObject The confusion stems from the different roles that @ ObservedObject and @ Published play in SwiftUI. What to Do? Instead of using @ ObservedObject for blePeripheralDevice in BLEManager, you should declare it as @ Published. Here’s the corrected version: [[See Video to Reveal this Text or Code Snippet]] Why This Works The key distinction is that: @ ObservedObject is used to observe changes in properties that conform to the ObservableObject protocol. This is most typically applied within view structs. @ Published is used to mark properties in an ObservableObject, allowing those properties to notify their observers when they change. In this context, since BLEManager is observing the state of BLEPeripheralDevice, you should publish the device itself so that it can be updated whenever necessary. Conclusion In conclusion, you’ve learned that to fix the ObservedObject error in SwiftUI, simply replace @ ObservedObject with @ Published when defining blePeripheralDevice in BLEManager. By ensuring your properties and their respective roles are correctly defined, you can avoid these compilation errors in the future. Key Takeaways Use @ Published for properties in ObservableObject classes. Reserve @ ObservedObject for use in views to observe changes in published properties. Now, you should have a better understanding of how to manage these properties in SwiftUI. Happy coding!