ios - 将数据添加到 CoreData 需要很多时间

Question

//添加核心数据的代码。有 2000 个联系人需要添加。但添加 2000 条数据需要 45 秒。

func addData(contacts: [CNContact]) {
    for data in contacts {
         let context = appDelegate.persistentContainer.viewContext
        let entity = NSEntityDescription.entity(forEntityName: entityName, in: context)
        let newUser = NSManagedObject(entity: entity!, insertInto: context)
        newUser.setValue(data.identifier, forKey: "contactIdentifier")
        newUser.setValue(data.familyName, forKey: "finalName")
        newUser.setValue(data.givenName, forKey: "givenName")
        newUser.setValue(data.phoneNumbers.first?.value.value(forKey: "stringValue") as? String ?? "", forKey: "phoneNumber")
        do {
            try context.save()
        } catch {
            UIUtility.showErrorAlert("", message: Constants.errorMessage)
        }
    }

}

Answer 1

首先将此行移到循环之前，因为您只需要执行一次

let context = appDelegate.persistentContainer.viewContext

然后将接下来的两行替换为

let newUser = NSEntityDescription.insertNewObject(forEntityName entityName, into: context)

所以函数的开头应该是这样的

let context = appDelegate.persistentContainer.viewContext
for data in contacts {
    let newUser = NSEntityDescription.insertNewObject(forEntityName entityName, into: context)
    //...