swift - 如何在 Swift 3 中消除警告

Question

我正在使用restKit + 核心数据堆栈。这并不是什么大问题，但它只是让我烦恼。这是我的代码中唯一的警告。也许我做错了什么。请给我一些方法来平息这一切。

Warning: Immutable value 'persistentStore' was never used; consider replacing with '_' or removing it!

{
    let persistentStore: NSPersistentStore?
    do {
        try persistentStore = managedObjectStore?.addSQLitePersistentStore(atPath: storePath, fromSeedDatabaseAtPath: nil, withConfiguration: nil, options: nil)
    } catch {
        fatalError("Error migrating store")
    }
}

Answer 1

如果您不使用persistentStore，那么只需:

尝试 _ = ManagedObjectStore?.addSQLitePersistentStore(atPath: storePath, fromSeedDatabaseAtPath: nil, withConfiguration: nil, options: nil)