使用 Core Data

Thomas Mak wrote at 2021-04-18.

Keywords：

PersistentContainer
PersistentStore
PersistentStoreCoordinator
Entity
EntityDescription
Context
Managed Object

Managed Object code generation

Class Definition: 全部 Xcode 管理
Category/Extension: 自己定義 NSManagedObject subclass，Xcode 管理 Extension
Manual/None: 自己定義 NSManagedObject subclass 及 Extension

自己管理越多，彈性越大，但亦越要自己動手寫。

新增記錄

let entity = NSEntityDescription.entity(forEntityName: "Friend", in: persistentContainer.viewContext)
        
let friend = Friend(entity: entity!, insertInto: persistentContainer.viewContext)
friend.name = "Jack Chan"
friend.tel = "66661234"
self.saveContext()

搜尋記錄

let fetchRequest:NSFetchRequest<Friend> = Friend.fetchRequest()

do {
    let results = try persistentContainer.viewContext.fetch(fetchRequest)
    print(results.count)
    for friend in results {
        print(friend.name)
        print(friend.tel)
    }
} catch {
    print("Fetch error.")
}

刪除

persistentContainer.viewContext.delete(friend)

保護層級

NSFileProtectionComplete
NSFileProtectionCompleteUnlessOpen
NSFileProtectionCompleteUntilFirstUserAuthentication
NSFileProtectionNone

More Detail： https://pspdfkit.com/blog/2017/how-to-use-ios-data-protection/

Apple iOS Security Guide： https://www.apple.com/business/docs/iOS_Security_Guide.pdf

設定 File Protection Tips:

Enable File Protection using the Capabilities tab on your app target
If you do not want the default NSFileProtectionComplete, change this setting in the developer portal under your app id
Make sure Xcode has the new provisioning profile this creates.
For protecting files your app creates, that's it.
To protect Core Data, you need to add the NSPersistentStoreFileProtectionKey: NSFileProtectionComplete option to your persistent store.

storeDescription.setOption(FileProtectionType.completeUnlessOpen as NSObject, forKey: NSPersistentStoreFileProtectionKey)
            container.persistentStoreDescriptions = [storeDescription]

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