One of Core data use (Swift): Save

Core data is used to persist data, which is a technology based on the SQLite database.

So how is it implemented in Swift?

First, you need to create a new template, open the project in the Xcdatamodeld file, click "Add Entity", this time, the creation of a template. After that, you can modify the name of the template to the name you want. Then, in attributes, click "+", add the field and modify the type.

Then, in the code "import CoreData". Next, save the object with Nsmanagedobject, which can be converted to any object. Its type is a dictionary.

To read data from an existing list:

var fileslist = [Nsmanagedobject] ()

String name = Filelist[0].valueforkey ("name") as String?

Save the sample, divided into five steps:

Save data to Entity

Func savefiles (name:string, content:string) {

The first step is to get the core data agent:

Let appdelegate = Uiapplication.sharedapplication (). Delegate as Appdelegate//General Agent

Step two, get the managedobject.

Let Managedcontext = Appdelegate.managedobjectcontext

The third step is to get the entity:

Let entity = Nsentitydescription.entityforname ("article", inmanagedobjectcontext:managedcontext!)

The fourth step is to initialize the object to be inserted and set the value of the object:

Let file = Nsmanagedobject (entity:entity!, Insertintomanagedobjectcontext:managedcontext)

File.setvalue (name, Forkey: "Name")

File.setvalue (Content, Forkey: "Content")

Fifth Step, Save:

var error:nserror? = Nil

managedcontext!. Save (&error)

Sixth step, save the data to the list

Self.filesTable.insert (file, atindex:0)

}

One of Core data use (Swift): Save