![]() The other will be a single view iOS application. We’ll be creating two Xcode projects during this walkthrough: One will be the framework and will be called “CarKit”. The app will target car enthusiasts everywhere – we will empower car fanatics to manage of a list of their favorite cars. The only difference between the apps will be the target platform. Our team is building an iOS app and a Mac app and the underlying data model will be exactly the same between them. Our working example for this walkthrough will be the following: Whatever the case may be, wouldn’t it be awesome to design the Core Data model once and share it between your projects? Maybe you’re building several iOS apps that have different user interfaces but share some underlying persistence-layer models. Perhaps you’re working on an iOS + Mac app combination and the data model for each is identical. Not only can we share code between projects, we can also share Core Data models between projects by utilizing frameworks! ![]() With the introduction of dynamic frameworks in iOS 8, a world of possibility opened up for iOS developers to achieve some pretty cool re-use scenarios, one of which we’re going to dive into today. We strive for it though, because in the long run, it makes maintaining the code far, far easier than if we just settled for copying and pasting. I borrow the name from Anonymous function.Code re-use is a powerful thing, but it’s not always easy to pull off. You can also use a declaration to extend the behavior of an existing named type and to import symbols into your program that are declared elsewhere. For example, you use declarations to introduce functions and methods, to introduce variables and constants, and to define enumeration, structure, class, and protocol types. ![]() This is the thing that you have to consider when adopting a type alias.Ī declaration introduces a new name or construct into your program. But if you use the new type many places in your code, the benefit might outweigh the overhead. This might cause unnecessary overhead and confusion. It gives you the ability to give a nickname or synonym to an existing type, giving a more meaningful name to convey a clearer message to the reader.Įveryone has to check out for a definition of the type when they first encounter the type. ConclusionĪ type alias is a powerful tool. Sponsor and reach thousands of iOS developers. You can easily support by checking out this sponsor. Here is another example where I provide concrete types for all of the generic parameters. The later function might leave you wondering what argument the method expects it can be seconds, minutes, or hours. You can tell at a glance that the first one expected a number of seconds. This gives more context to our methods and code.Ĭompare these two identical methods. Based on the comment, we know that the double represents the number of seconds. TimeInterval gives more context to the type Double. In Foundation, it declares a TimeInterval type alias for a type Double. Let's take a look at the TimeInterval type. We use this to give a more meaningful name to convey a clearer message to the reader. They simply allow a name to refer to an existing type. We use typealias to introduce a new semantic type out of the existing one. We can assign Int to the new i type without any problem. Here is an example of declaring a type alias of Int as i. Since typealias is just a nickname of the existing type, you can use it interchangeably everywhere in your app. Type alias declarations are declared using the typealias keyword and have the following form: typealias name = existing type
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