![]() To ensure no unexpected data is stored, I like to open the User Defaults from an application installed on the Simulator. Even though you might think you’re in control, there could be preferences data stored by 3rd party libraries. While you can use the didChangeNotification to observe for changes, I recommend looking into managed solutions like this User Defaults Property Wrapper.Īs an app developer, keeping an eye on stored data is essential. If your type is not on this list, you need to find a way to convert it to any of the supported types. You can use a JSONEncoder to encode the instance to data and decode it when you read the value.īy default, User Defaults support the following types: (Stock(symbol: "AAPL"), forKey: "last-opened-stock")Īnytime you run into an exception like this, you must convert the data before storing it. In this case, I tried to store an encodable object: *** Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘Attempt to insert non-property list object UserDefaults.Stock(symbol: “AAPL”) for key last-opened-stock’ You’ll run into the following error as soon as you write an unsupported object: Property lists must support the objects you store inside User Defaults. I’m using this technique inside Stock Analyzer to populate widgets based on favorite stocks configured in the main application. (, forKey: "favorite-stocks")Īny app or extension configured with the same app group will now be able to read and write the favorite stocks. You can now access the shared group container anywhere by making use of the static property: Static let group = UserDefaults(suiteName: "") Once configured, you can create a new user defaults instance using the group identifier: You can find detailed instructions inside Apple’s documentation. Not depend on any OS or hardware, and we haven’t been able to reproduce it yet. This bug seems to have been around since October 2020. A device that has happened once is likely to happen again. You can start sharing User Defaults with other apps and extensions by adding the App Groups capability. My app user sometimes lost data in UserDefaults when our app launched. To configure App Groups you need to add a new capability to your project’s settings: Even though there might not be a need to share preferences right now, you’ll thank yourself later if you add extensions that need to read or write preferences from the main app. I highly recommend using this technique for any app from the start. Using so-called app groups, you can share the User Defaults container with other apps and extensions. ![]() Sharing User Defaults with other apps and extensions However, you might want to consider using group user defaults. In this case, we’re using the standard user defaults container. The code to store preferences like these could look as follows: You can store preferences like the user’s favorite stocks or save specific user states like “user has seen the onboarding.” It's available only until October 1st, so click to get it now! What are User Defaults?Īpps commonly use User Defaults to store users’ preferences. If you’re a mid/senior iOS developer looking to improve your skills and salary level, join this 100% free online crash course. Now that we have created the two suites we need to add some data to them.FREE iOS Architect Crash Course for a limited time! override func viewDidLoad() Step 2: Add data to the different suites These updates affect the Team Chat tab of the client settings, the channel. I am doing everything in the viewDidLoad for this step so that I cannot use these instances of UserDefaults later on. Settings for controlling chat notifications are updated for clarity and ease of use. I am going to create two suites so that we can see later on how each suite has a different value for the same key. All we have to do is initialize UserDefaults with the suiteName that we want to use. Step 1: Create new suiteĬreating a new suite with UserDefaults is super simple. Using the global domain is also not allowed as it is not writeable by apps. Your suiteName cannot be the same as your apps bundle identifier. You havent isolated the issue enough to where you know only Swift is the problem, and theres little chance it is. ![]() Theres more than just Swift being updated here: iOS changed, Xcode changed. It likely has to do with what PEEJWEEJ mentioned. This can allow you to create different UserDefaults for different sections of your app, but it also allows you to share content between multiple apps and extensions that use the same App Group. To update the array of strings in the users defaults database, we need to invoke the set(:forKey:) method on the shared defaults object. Swift is the language itself, so its very unlikely that is the cause. UserDefaults contains different suites that are identified by their suiteName. 2 min read What are UserDefaults suites.
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