CoreDataOperation
CoreDataOperation is a fast, safe, flexible operation for updating your core data models. It supports the latest Swift 2.1 syntax, and does all its work in a background managed object context.
Installation
- Using CocoaPods by adding
pod CoreDataOperationto your Podfile - Using Carthage by adding
github "Adlai-Holler/CoreDataOperation"to your Cartfile.
How to Use
let likeOperation = CoreDataOperation<Int>(targetContext: myContext, saveDepth: .ToPersistentStore) { context in
guard let post = Post.withID(postID, inContext: context) else {
throw Error.PostWasDeleted
}
if post.doILike {
post.doILike = false
post.likeCount -= 1
} else {
post.doILike = true
post.likeCount += 1
}
post.updatedAt = NSDate()
return post.likeCount
}
likeOperation.setCompletionBlockWithSuccess( { likeOperation, likeCount in
// Switch to main queue to update UI
dispatch_async(dispatch_get_main_queue()) {
likeCountLabel.text = String(likeCount)
}
}, failure: { likeOperation, error in
dispatch_async(dispatch_get_main_queue()) {
// Show an error.
}
})
myOperationQueue.addOperation(likeOperation)
Features
- Safe. All operations are confined to a private, background context, so if you get into a bad state, none of your working contexts will be affected.
- Fully asynchronous. No threads are blocked, no two contexts are locked at the same time, and no context is locked for any longer than it absolutely must be.
- Cancelable. The operation checks if it is canceled after each step.
- Modern Swift syntax. Your operation block can throw an error, and it can return a value of any type which can be accessed after the operation is over.
- Lightweight. The body block is disposed of after executing, and the target managed object context is not retained.
- Tests! CoreDataOperation is tested like crazy.
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