Can't use Swift classes inside Objective-C

Question

I try to integrate Swift code in my app.My app is written in Objective-C and I added a Swift class. I\'ve done everything described he

Answer 1

Using Swift Classes in Objective-C

If you are going to import code within an App Target (Mixing Objective-C and Swift in one project) you should use the next import line #import "<#YourProjectName#>-Swift.h" to expose Swift code to Objective-C code [Mixing Swift and Objective-C code in a project]

In this post I will describe how to import Swift static library to Objective-C code

Objective-C consumer -> Swift static library

Xcode version 10.2.1

Create Swift static library

Follow Create Swift static library with next additions:

Expose Swift API. To use Swift's functions from Objective-C[About]

After building you should find a -Swift.h file that should be located into DerivedSources [File not found]

Objective-C consumer with Swift static library

Drag and drop the binary into the Xcode project[About]

Link Library[Undefined symbols] [Link vs Embed]

Project editor -> select a target -> General -> Linked Frameworks and Libraries -> add -> Add Others... -> point to `lib.a` file
//or
Project editor -> select a target -> Build Phases -> Link Binary With Libraries -> add -> Add Others... -> point to `lib.a` file

Add Library Search paths[Library not found for] [Recursive path]

Project editor -> select a target -> Build Settings -> Search Paths -> Library Search paths -> add path to the parent of `lib.a` file

Add Header Search Paths[Module not found] [Recursive path]

Project editor -> select a target -> Build Settings -> Search Paths -> Header Search Paths -> add path to generated `-Swift.h` file 

Add empty .swift file to the Objective-C project.[Undefined symbols] When Xcode ask press Create Bridging Header(it will create module_name-Bridging-Header.h) and setup a path to this file in

Project editor -> select a target -> Build Settings -> Swift Compiler - General -> Objective-C Bridging Header

Import module to the Objective-C client code[File not found] [module_name]

#import "module_name-Swift.h"

More examples here