Static Library and Swift

Question

So I\'m working on an iOS project in Swift, and I wanted to create a Static library with some useful stuff in it.

My problem is when I try to build my lib in Xcode (

Answer 1

Swift consumer -> Swift static library

Xcode version 10.2.1

Create Swift static library

Create a library project or create a library target

File -> New -> Project... -> Cocoa Touch Static Library
//or
Project editor -> Add a Target -> Cocoa Touch Static Library 

Add files .swift

Select `.swift` file -> Select File Inspectors Tab -> Target Membership -> Select the target
//or
Project editor -> select a target -> Build Phases -> Compile Sources -> add files

Build library - ⌘ Command + B or Product -> Build

Note 1: Be sure that you build library for the same process architecture as the client code.
Note 2: expose your API that should be visible for consumer using public or open access modifiers[About]

Find generated output[Build location]

Products group -> lib.a -> Show in Finder

The directory includes

• lib.a – a built static library
• .swiftmodule. swiftmodule describe an interface of a library and a compiler version. This folder includes:
  • .swiftdoc - docs
  • .swiftmodule - public interface/definitions

Swift consumer with Swift static library

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

Link Binary[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 Import Paths[No such module] [Recursive path]

Project editor -> select a target -> Build Settings -> Swift Compiler - Search Paths -> Import Paths -> add path to a folder with `.swiftmodule`

Import module to the Swift client code [module_name]

import module_name

[More examples]