3/16/2024 0 Comments Cocoa json editor downloadThat means “set the date property to the current date.” First, try adding this line below the previous three: commit.date = Date() However, this feature is imperfect, at least right now – although that might change at any point in the future as Apple updates Xcode. You get access to its attributes as properties that you can read and write, and any changes you make will get written back to the database when you call our saveContext() method. You can’t see it in the project – it’s dynamically generated when the Swift code is being built – but it’s there for you to use, as you just saw. Open ViewController.swift and add this code at the end of viewDidLoad(): let commit = Commit()Ĭan you figure out what Xcode has done for us? The Codegen value is short for “code generation” – when you pressed Cmd+B to build your project, Xcode converted the Commit Core Data entity into a Commit Swift class. What just changed might look small, but it’s remarkably smart. Change it to “Class Definition”, press Cmd+S to save the change, then press Cmd+B to have Xcode build the project. Let’s look at it briefly now: open Project38.xcdatamodeld, select the Commit entity again, then look in the data model inspector for the “Codegen” option. There are two ways Xcode can help, one of which isn’t good enough for this project but is slowly getting better – maybe when I update this project next it will be update to scratch. So, it's time for step three: creating objects in Core Data so that we can fetch and store data from GitHub. It's not perfect, as you'll see shortly, but it's certainly a head start. If this sounds complicated, relax: Xcode can do quite a bit of work for us. For example, you already saw the hasChanges property of a managed object context – that automatically gets set to true when you make changes to your objects, because Core Data tracks when you change properties that are marked the scenes, effectively means "extra code will automatically be provided when the program runs." It's a bit like functionality injection: when you say "this property is then Core Data will add getters and setters to it when the app runs so that it handles things like change tracking. This is a Core Data subclass of NSObject that uses a unique keyword, to provide lots of functionality for its properties. After changing those objects, we can save them back to the persistent store, which is when Core Data converts them back from objects to database records.Īll this is done using a special data type called NSManagedObject. In our app, Core Data is responsible for reading data from a persistent store (the SQLite database) and making it available for us to use as objects. Then, only when the files differ you move the temporary file into place.Creating an NSManagedObject subclass with Xcode If for some reason the input/output file setup above doesn't work for you, you can also decide to first write the file to a temporary location, and then compare this temporary file to the current one. There's an open issue to auto-generate input and output file lists which will be addressed as part of Apollo iOS 1.0, but this will help until that's done. The script will still run if you explicitly build and run. This should prevent automatic rebuild cycles if none of the InputFiles are changed. Then, you can add $(SRCROOT)/YourTarget/API.swift (the path you're running it from + the output file) to the list of Output Files : If you're using a tool like Interface Builder or SwiftUI to talk to a module with its own code generation build step, this is helpful to prevent the API.swift file from causing an auto-regeneration loop.įor example, if you're using something like this to run your code generation for a target called YourTarget :Īssuming you've set the script to run from $(SRCROOT)/YourTarget, you can add $(SRCROOT)/YourTarget/**/*.graphql (the path you're running it from + the glob you're passing to the includes CLI parameter) to the list of Input Files for your Apollo Run Script Build phase. Prevent unnecessary recompilation Set up input and output files in your build phase Advanced codegen tips and tricksĪfter you get up and running, here are a few improvements you can make to your codegen process. You can also continue reading below for some advanced codegen tips. To learn how, next check out Creating a client and Fetching queries. Installation complete! You can now start executing GraphQL operations in your app. Then, make sure you've checked all the Targets the API file needs to be included in. Make sure to uncheck the "Copy Files If Needed" checkbox, because it should already be in your project's folder system. Note: Because Apollo iOS generates operation -specific result types, API.swift is mostly empty at this point unless you've already added multiple.
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