Implementing OC and Swift in Swift

In Swift to refer to the OC header file (import), you can use a mixed method, here in SQLite as an example, using Oc-swift Bridge to implement the Add header file
1 introducing the library file of the SQLite database

Open the project configuration file and add Sqlite3 to the third option in the Build Phases Options tab

2. Create a bridge file Command + N key Select Create header file

Write a name

The file to be introduced will be introduced in this header bridge file, and the import statement will be written here.

3 Configuring bridging files
Open the Project profile and enter bridge in the Build Setting Options tab search box to the Objective-c bridging header option. In the options, configure the path to the header file you just created (project name + header filename).

Verify that the function of the integrated OC in Swift is implemented, go to the Appdelegate.swift file and enter SQLite, if prompted, prove that the mixed OC in Swift succeeds, otherwise, the failure

Implementing OC and Swift in Swift