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我刚刚在Core Data上设置了只读数据存储。它的工作原理,但编译器有抱怨,我想知道如何解决这个问题。NSPersistentContainer/Core Data/ReadOnly存储
这里的相关代码是我在Xcode自动生成模板后修改它的。
lazy var persistentContainer: NSPersistentContainer = {
let container = NSPersistentContainer(name: "MyApp")
let appName: String = "MyApp",
storeUrl = Bundle.main.url(forResource: appName, withExtension: "sqlite")
var persistentStoreDescriptions: NSPersistentStoreDescription
let description = NSPersistentStoreDescription()
description.shouldInferMappingModelAutomatically = true
description.shouldMigrateStoreAutomatically = true
description.url = storeUrl
container.persistentStoreDescriptions = [description]
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()
现在,这是我从编译器得到的消息:
[error] CoreData: error: Attempt to add read-only file at path ...../MyApp.app/MyApp.sqlite read/write. Adding it read-only instead. This will be a hard error in the future; you must specify the NSReadOnlyPersistentStoreOption.
如何使编译器很高兴我设置这个选项?
是的,它做到了。谢谢。对于persistentStoreDescriptions是真的。 – Michel