![]() This is done inside the Capabilities tab of your target's settings – find iCloud, then flick its switch to be On. There is one final, important thing to do: you need to enable iCloud for your app. With that prefix, MKiCloudSync will copy to iCloud only UserDefaults keys that start with sync – you can now choose what you want to sync just by naming your keys appropriately. The "sync" part is important, because chances are you won't want to sync everything to iCloud. Now open your AppDelegate.swift file, find the didFinishLaunchingWithOptions method, and add this line to it: MKiCloudSync.start(withPrefix: "sync") To actually use the library, open your new bridging header (it'll be called something like YourProject-Bridging-Header.h) and add this: #import "MKiCloudSync.h" Xcode will ask you if you want to create an Objective-C bridging header, and you should click "Create Bridging Header" - this is required because MKiCloudSync is written in Objective-C rather than Swift. Inside the zip file you'll find MKiCloudSync.h and MKiCloudSync.m, and you should drag them both into your Xcode project. To use it, go here and click Download Zip. It's open source and so easy to use you literally don't notice that it's there once you've added it to your app – it just silently syncs your UserDefaults values to and from iCloud. One such example is called MKiCloudSync and it's available from here. Example for the UserDefaults ( ) How to use it Saving details: Defaults. Fortunately, other developers have written simple wrappers around it so that you can forget about iCloud and focus on the interesting things instead – i.e., the rest of your app. A Small Example for Managing a Small Session for User Details In this example, we’re covering saving with Dictionary and retrieving user data through the Model class. IOS has a built-in iCloud sync system called NSUbiquitousKeyValueStore, but to be honest it's pretty unpleasant to work with. If you worked on a complex project that dealt in some other way with services and dependency injection, you probably stumbled upon service protocols that your service classes implement.How to store UserDefaults options in iCloud ![]() Well, when using you can easily delete all service parameters in your initializers and apply to the members you were using before. The most common case in app development is instantiating view models. If you used proper dependency injection techniques, you are familiar with having numerous parameters for class/struct initializers. # 1) Services passed as initializer parameters It is better to simplify it to only one line of code (See line 2 & line 5 above). No matter where you access your dependencies, you can now replace most of your code with the property wrapper. For example, if you want to share defaults across several app extensions you might create your own UserDefaults instance. UserDefaults syntax for saving and retrieving data is long and dull. Or if you're refactoring a specific service that’s been partially completed, you can supplement a service with another. That way, if you want to mock a specific service for testing purposes, you can do so without much hassle. An easy way to achieve this is to pass services you depend on inside to the initializer of your class. From the pop-up menu, choose Group to change the type of the control. This displays a pop-up menu with a list of item types. Change Item 3 into a Group control and name it User Info. For example, to use Cloud Firestore and Authentication: SwiftUI Swift Objective-C. At this point, you have finished the first group of settings and are ready to create the User Info group. After that, we tell it to set an object with a specific key. But where's the benefit in this? Well, testability and ease of refactoring are just some of them. Use Swift Package Manager to install and manage Firebase dependencies. Below is sample code of how to do that: let defaults UserDefaults.standard t ('Coding Explorer', forKey: 'userNameKey') So, the first line is getting a reference to something that can access NSUserDefaults with the standard class property. For example, instead of creating a service around user defaults inside your view models, you should be passed an instance of such service. # What's the deal with dependency injection and services?ĭependency injection is a design pattern achieved by **designing your code in a way that your objects or functions receive objects that they depend on, instead of creating their own**. Say hello to dependency injection with property wrappers! But what if I told you there was a way to write a minimum amount of code that's easy to maintain and test, and isn't hard to improve or adapt? Now, having a lot of singletons isn't a great idea, and the service factory pattern forces you to write the name of services numerous times – something which I, personally, despise. Developers attempted to do it in numerous ways – either by using singletons around the app or by making a service factory and passing an instance of that factory around. Trying to find an optimal way of injecting services around the codebase isn't a new topic.
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