Core Data

Changing a Core Data model after release risks breaking the data your users already have. Here, we look at how to migrate progressively, step-by-step through each model version, using lightweight migrations and custom NSEntityMigrationPolicy subclasses.

Core Data and Unit Testing haven't always been the best of friends ⚔️. Core Data is all about persisting. Unit testing is all about forgetting. Here, we look at how they can work together with the help of UIKit to ensure that we gain the confidence we need to ship an app.

People really care about their possessions. They hate when change breaks those possessions 😡. This is as true of digital possessions as physical possessions. Your data model will change, but it doesn't need to break anything. Here, we look at how to migrate a Core Data model step-by-step.

Parsing an API response into an app type is fundamental to any networked app. Here, we look at how to build a consistent response parsing approach to make that task easier than ever before.

Working with stringy APIs is prone to runtime errors, as the compiler can only enforce that a string is there or not, rather than if the value is correct or not. Core Data loves a stringy API. Here, we look at how to enhance the compiler's involvement with Core Data by de-stringifying the API.

Manually scrolling through a list of information to find what we need can be time-consuming, even for modestly sized lists. Here, we look at how to search through a list to find what we need using `UISearchBar`.