Create and use swift static library in Xcode 10.1

Question

I plan to create swift static library and use in ios swift app. I create a swift static libraryn call SimpleLib and it include a public class Greeting which return Hello World string:

// // Greeting.swift // SimpleLib // import Foundation public class Greeting { public func Hello() -> String { return "Hello World"; } public init() { } public static func SayMorning() -> String{ return "Hi, Morning"; } }

The swift static library project look like:

And the module.modulemap is defined as following:

module SimpleLib { header "SimpleLib-Swift.h" export * }

I build and produce a libSimpleLib.a file, I place the .a and other files (referred by other posts in internet to mention need put in app folder) in app folder:

In the app project, I include the Libs path in FREAMEWORK_SEARCH_PATHS, LIBRARY_SEARCH_PATHS and HEADER_SEARCH_PATHS and include .a file in Linked Framework

However, when I attempt to refer the Greeting class in the AppDelegate, I got the error - Use of unresolved identifier 'Greeting'

// // AppDelegate.swift // testStatic // import UIKit import SimpleLib @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { // Override point for customization after application launch. var s = Greeting return true } ...... }

How to make Swift objects in static library can be referred in the App. What is the proper steps to export the class/functions in swift static library? Anyone success to build and use swift static library in iOS app?

You should copy your code instead of posting screenshots. Screenshots can't be manipulated as text, which causes a lot of problems. People who read your question can't copy your code to try it out, and people who rely on screen readers can't know what your code is. — zneak
– zneak, Commented Jan 16, 2019 at 23:50
I update and copy my code in post. Hope it can help to understand my questions — interman
– interman, Commented Jan 17, 2019 at 18:11

kubrick G · Accepted Answer · 2019-01-25 07:09:30Z

3

Include your module.modulemap and arm64.swiftmodule path in app's SWIFT_INCLUDE_PATHS setting.

answered Jan 25, 2019 at 7:09

kubrick G

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Comments

zneak · Accepted Answer · 2019-01-16 23:48:41Z

The issue is that your class has the same name as your module. Try simple.simple() to create an instance of your class, or alternatively, rename either the module or the class.

Jonathan Pinlac · Accepted Answer · 2019-10-02 19:22:24Z

Make sure to add both the .a library and relevant .swiftmodule from the build product to app files. Then link the .a library in the "Linked Framework and Libraries" also make sure it's present in the Build Phases in "Link Binary with Libraries".

Lastly in build settings, under "Swift Compiler - Search Paths" > "Import Paths" add the path to the .swiftmodule folder. The paths are relative to the .xcodeproject.

Make sure that the classes and methods you are using are either open or public.

Ashi · Accepted Answer · 2020-01-29 16:47:38Z

This is the way to create a static library in Objective-C and Access in swift application. follow the below steps.

How import Objective-C static library project file in Swift Sample Codebase for debug.

Step 1. Copy-paste complete SDK source code in sample project directory

Step 2. Add static library project file in sample code.

Step 3. Add Library (TestStaticLib.a) dependancy and required C++ library or curl or lumberjack framework and etc

Select target-> Build Phases-> Add Library and framework.

Step 4. Link Dependency

Select on + and add universal library dependency.

Step 6. Set header search path for library .h files

Select target-> Build Setting-> Header Search Path

Put you library path like “$(SRCROOT)/ConnectSDKApp/TestStaticLib"

Step 7. Compile Universal library

Open library target separately and compile the Universal library.

Once compilation is done. Check-in library path in universal folder whether .a file created or not.

If created fine. Otherwise, check why it’s not created. .a file created through script. Which in

Library Universal target -> Build Phase and Run Script.

If .a file is not created no need to sample code. It will not compile the unit .a file not created.

FAQ.

Not able to find .h to header file which you linked in bridge header and tried to access like below.

import

Answers. You have not linked the correct header search path. Please check the step and set the correct header search path.

Linker error ServiceManager Objective C class missing.

Answers. Link dependency of your universal library step 4

Question 3. Application crashing… because of this reason

reason: '*** -[__NSDictionaryM setObject:forKey:]: object cannot be nil (key: com.hac.mapService.TomTom)'

Answers.

Question 4. Universal .a file not getting creating after building success.

Answers. Check script may be something wrong with the script.

Question 5. What is the use of the script.

Answers. Script required to create a universal library that is required for both device and simulator to compile.

TestStaticLib.a file only compile the same time for both device and simulator when created with device and simulator architecture.

Want to access .a static in your Project.

Step 1. Add Universal library (TestStaticLib.a) in your sample code which will compile for both Simulator and Devices

Step 2. Add Library (TestStaticLib.a) dependancy and required C++ library or curl or lumberjack framework and etc

Select target-> Build Phases-> Add Library and framework.

Step 3. Import .h file in Bridge header

Compile.

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