为什么在Swift项目中需要Objective-C桥接头？

Question

I am new in swift . I crated a swift project and I try to added NSmanagedObject subclass for core data but xcode telling me Would you like to configure an Objective-C bridging header?

what should i do ? and why ?

Flowing step I done :

create a single page application

then try to add subclass

then select the entity would i mange

then create

last things why added +coredatapropertice

Answer 1

Xcode is asking you if you'd like to create a bridging header because you are adding Objective-C files to a Swift project.

Since your project is written in Swift, I'm guessing that you meant to select 'Swift' as the language when creating your NSManagedObject subclasses.

Answer 2

This way to gain access to a library is to use the Objective-C bridging header. Since Objective-C is a superset of C, the bridging header also works to give you access to pure C libraries. This allow you to add the Objective-C file in our swift project