Ios 如何使用coredata脱机保存数据，如果网络（联机）出现，如何将保存的数据发送到API？

如何使用coredata在脱机状态下保存数据，如果网络出现（联机），如何将保存的数据发送到API

这是保存数据的代码：

func savePSaveInfo(cId: String, pId:String, createdBy:String, agep:String, languageId:String, emailId:String, mobileNumber:String,backendUpdate: Bool)
{    
    let nameObj = NSEntityDescription.insertNewObject(forEntityName: "SaveInfo", into: context!) as! SaveInfo

    nameObj.cId = cId
    nameObj.pId = pId
    nameObj.createdBy = createdBy
    nameObj.agep = agep
    nameObj.languageId = languageId
    nameObj.emailId = emailId
    nameObj.mobileNumber = mobileNumber
    nameObj.backendUpdate = backendUpdate    

    do{
        try context!.save()
    }catch{
        print("not saved")
    }
}

---

对于在核心数据中插入值，我正在分享一个示例，您可以根据您的数据进行设置

步骤1:-像这样设置实体

步骤2：-

//MARK:- FOR CREATING NEW DATA
    func createData(){

        //As we know that container is set up in the AppDelegates so we need to refer that container.
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }

        //We need to create a context from this container
        let managedContext = appDelegate.persistentContainer.viewContext

        //Now let’s create an entity and new user records.
        let userEntity = NSEntityDescription.entity(forEntityName: "User", in: managedContext)!

        //final, we need to add some data to our newly created record for each keys using


        let user = NSManagedObject(entity: userEntity, insertInto: managedContext)
        user.setValue(txtFldUsername.text!, forKeyPath: "username")
        user.setValue(txtFldEmail.text!, forKey: "email")
        user.setValue(txtFldPassword.text!, forKey: "password")

        retrieveData()
        //Now we have set all the values. The next step is to save them inside the Core Data

        do {
            try managedContext.save()

        } catch let error as NSError {
            print("Could not save. \(error), \(error.userInfo)")
        }
    }

停止3:-用于获取数据

 //MARK:- FOR RETRIEVING OR FETCHING THE DATA
    func retrieveData() {

        //As we know that container is set up in the AppDelegates so we need to refer that container.
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }

        //We need to create a context from this container
        let managedContext = appDelegate.persistentContainer.viewContext

        //Prepare the request of type NSFetchRequest  for the entity
        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "User")

        do {
            let result = try managedContext.fetch(fetchRequest)
            arrUserDetails.removeAll()
            for data in result as! [NSManagedObject] {
                print(data.value(forKey: "username") as! String)
                arrUserDetails.append(userData(username: (data.value(forKey: "username") as! String), email: (data.value(forKey: "email") as! String), password: (data.value(forKey: "password") as! String)))
            }
            tblView.reloadData()

        } catch {

            print("Failed")
        }
    }

//标记：-用于检索或获取数据
func retrieveData（）{
//正如我们所知，容器是在AppDelegates中设置的，因此我们需要引用该容器。
让appDelegate=UIApplication.shared.delegate作为？appDelegate else{return}
//我们需要从这个容器中创建一个上下文
让managedContext=appDelegate.persistentContainer.viewContext
//为实体准备NSFetchRequest类型的请求
let fetchRequest=NSFetchRequest（entityName:“用户”）
做{
let result=尝试managedContext.fetch（fetchRequest）
arrUserDetails.removeAll（）
对于结果中的数据！[NSManagedObject]{
打印（data.value（forKey:“username”）为！字符串）
arrUserDetails.append（userData（用户名：（data.value（forKey:“用户名”）作为！字符串），email：（data.value（forKey:“email”）作为！字符串，password：（data.value（forKey:“密码”）作为！字符串）
}
tblView.reloadData（）
}抓住{
打印（“失败”）
}
}

---

仍然存在任何问题，请让我了解查询

请分享您为此所做的工作。基本上，您应该创建一个类似于

ConnectivityService

的服务来检查internet连接，如果它处于脱机状态，您应该通过

CoreData

保存数据，然后您可以观察来自

ConnectivityService

的通知。当网络上线时，您可以将数据从<代码> CordaDATA/code >发送到API，请考虑如下：StasOfFuff.com／Apple / Hooto to Advices并提供可重复的可复制代码，因为这不是“我们为您免费编写代码”-平台，而是“我们帮助您提供您的代码”-平台