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Smalley Full Popular. Lindeburg PE Full Online. Burns Full Popular. Hooyman Full Ebook. Core Data has many other features aside from simply storing and fetching data:.
You can perform custom filtering with predicates, sort the data and and calculate statistics. This chapter covers the basics of setting up your data model and then adding and fetching records. This chapter will teach you how you customize your own managed object subclasses to store and validate data. Chapter 4, Intermediate Fetching : Your apps will fetch data all the time, and Core Data offers many options for getting the data to you efficiently. This chapter covers more advanced fetch requests, predicates, sorting and asynchronous fetching.
You can now dynamically apply sorts and filters to lists and see the results update immediately. Download the starter project by clicking the Download Materials button at the top or bottom of the tutorial.
Open the starter project and take a peek around. It uses Core Data for persistence. Open PersistenceManager. This class handles Core Data setup and save operations. The setup is standard — you initialize an NSPersistentContainer and use that to load the persistent stores. Open AppMain. Finally, open ContentView. Prior to iOS 15, you would need to set up your Core Data stack before adding it to the environment.
If a view attempted to access the view context before setup, you would most likely see a crash. With iOS 15, lazy entity resolution solves that problem. You can remove some boilerplate code because of this.
Update the environment variable in AppMain to the following:. You are now accessing the view context directly from PersistenceManager and adding it to the environment. This allows ContentView , and all its child views, to use the view context from the. Dynamic sorting is another new feature in iOS With dynamic sorts, you can apply new sort descriptors directly to your list of fetched items backed by the FetchRequest property wrapper.
Updating the sort descriptors will cause the view to refresh immediately. You can apply animation by default as well. First, create a model object representing a single sort. In the Xcode Project navigator on the left sidebar, open the Model group.
Create a new Swift file and name it FriendSort. Add a list of pre-cooked sort options for the user to choose from, by adding the following static properties to FriendSort :. Take a moment to update the FetchRequest property wrapper in ContentView. Find this code at the top in FetchRequest :.
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