![]() ![]() ![]() You can pass in a UserDefaults object to each property, but this is may not be the best idea if you are these wrapped properties in many places. There is no easy way to write testable code with this. There is one disadvantage that I was able to find with this method, so if you find a good way to deal with it, let me know, I’m more than happy to hear potential ideas for this. Instead you just have to write a property wrapper file and never concern yourself with it again. You don’t have to maintain very large singleton files for your settings.By treating them as properties, you can put them at the top of the class and the next developer who maintains the code will know what defaults are relevant for that screen:Ĭlass CalendarViewController: UIViewController. Whether the app should lock and currency types are irrelevant here. Then you have a CalendarViewController where the user can see his configured locale, timezone, and calendar type. For example, suppose you have an app where you can configure a default locale, calendar type, timezone, if the app should be locked with FaceID when entering the background, and a currency type. This way, we can create properties that represent said setting, and then you will know what settings are relevant in different view controllers or other areas of your app. ![]() In this architecture, we will write a property wrapper for User Defaults, and we will use it for all defaults that come to mind. It’s more obvious to see what settings are relevant in different view controllers.I found more pros than cons when it comes to using wrapped properties for use defaults, including: How do you logically separate the properties? Does it even make sense to wrap a singleton around everything related to user defaults?įor this reason, people have devised different ways to deal with user defaults, and I’m going to show you a new one. Singletons can grow, and it can be a pain to maintain if they have too many properties. This works, but singletons in general are not a pattern everyone is particularly a fan of. I don’t know about you, but a pattern I see a lot (and I’m guilty of doing this myself) is to just wrap all user defaults in a Singleton. In this article, we will build upon that to write a very nice property wrapper for user settings based on NSUserDefaults. Last week we talked about Property Wrappers, what they are, and how they work with Swift. I recommend you read this article first, and then go back to Christian’s to see more downsides of this idea other than the ones I mentioned below. That said, you may or may not want to implement this in a real app. The main idea is that property wrappers allow you to store your values differently and even externally. Once you understand how property wrappers work, you can use this article to apply it to user defaults. Soon after I published this article, Christian Tietze wrote a fair criticism of this idea here. ![]()
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