How can I import Swift code to Objective-C

Question

I have written a library in Swift and I wasn t able to import it to my current project  written in Objective-C   Are there any ways to import it     import  SCLAlertView swift  -  SCLAlertView swift  file not found

User · Answer

If you want to use Swift file into Objective-C class  so from Xcode 8 onwards you can follow below steps   If you have created the project in Objective-C    Create new Swift file Xcode will automatically prompt for Bridge-Header file Generate it Import  ProjectName-Swift h  in your Objective-C controller  import in implementation not in interface   if your project has space in between name so use underscore  Project Name-Swift h   You will be able to access your Objective-C class in Swift    Compile it and if it will generate linker error like  compiled with newer version of Swift language  3 0  than previous files  2 0  for architecture x86 64 or armv 7  Make one more change in your    Xcode -  Project -  Target -  Build Settings -  Use Legacy Swift Language Version -  Yes   Build and Run

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Here s what to do    Create a new Project in Objective-C Create a new  swift file        A popup window will appear and ask  Would You like to configure an Objective-C bridging Header    Choose Yes   Click on your Xcode Project file Click on Build Settings Find the Search bar and search for Defines Module  Change value to Yes  Search Product Module Name  Change the value to the name of your project  In App delegate  add the following    import  YourProjectName-Swift h      Note   Whenever you want to use your Swift file you must be import following line       import  YourProjectName-Swift h

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First Step -   Select Project Target -  Build Setting -  Search  Define   -  Define Module  update value No to Yes   Defines Module   YES    Always Embed Swift Standard Libraries    YES    Install Objective-C Compatibility Header    YES     Second Step -   Add Swift file Class in Objective C   h  File as below    import  lt UIKit UIKit h gt    class TestViewController Swift File     interface TestViewController Objective C File    UIViewController   end   Import  ProjectName Your Project Name -Swift h  in Objective C   m  file     TestViewController m   import  TestViewController h     import ProjectName-Swift h file to access Swift file here     import  ProjectName-Swift h

User · Answer

There s one caveat if you re importing Swift code into your Objective-C files within the same framework  You have to do it with specifying the framework name and angle brackets    import  lt MyFramework MyFramework-Swift h gt   MyFramework here is the  Product Module Name  build setting  PRODUCT NAME   MyFramework    Simply adding  import  MyFramework-Swift h  won t work  If you check the built products directory  before such an  import is added  so you ve had at least one successful build with some Swift code in the target   then you should still see the file MyFramework-Swift h in the Headers directory

User · Answer

If you re using Cocoapods and trying to use a Swift pod in an ObjC project you can simply do the following       import  lt FrameworkName gt

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Search for  Objective-C Generated Interface Header Name  in the Build Settings of the target you re trying to build  let s say it s MyApp-Swift h   and import the value of this setting   import  MyApp-Swift h   in the source file where you re trying to access your Swift APIs   The default value for this field is   SWIFT MODULE NAME -Swift h  You can see it if you double-click in the value field of the  Objective-C Generated Interface Header Name  setting   Also  if you have dashes in your module name  let s say it s My-App   then in the   SWIFT MODULE NAME  all dashes will be replaced with underscores  So then you ll have to add  import  My App-Swift h

User · Answer

Instructions from the Apple website      To import Swift code into Objective-C from the same framework      Under Build Settings  in Packaging  make sure the Defines Module   setting for that framework target is set to Yes  Import the Swift code   from that framework target into any Objective-C  m file within that   framework target using this syntax and substituting the appropriate   names        import  ProductName-Swift h    Revision   You can only import  ProductName-Swift h  in  m files      The Swift files in your target will be visible in Objective-C  m files   containing this import statement       To avoid cyclical references  don   t import Swift into an Objective-C   header file  Instead  you can forward declare a Swift class to use it   in an Objective-C header  Note that you cannot subclass a Swift class   in Objective-C

User · Answer

Go to build settings in your project file and search for  Objective-C Generated Interface Header Name  The value of that property is the name that you should include   If your  Product Module Name  property  the one that the above property depends on by default  varies depending on whether you compile for test debug release etc  like it does in my case   then make this property independent of that variation by setting a custom name

User · Answer

import  lt TargetName-Swift h gt    you will see when you enter from keyboard  import  lt  and after automaticly Xcode will advice to you

User · Answer

Find the  PCH file inside the project  and then add   import  YourProjectName-Swift h  This will import the class headers  So that you don t have to import into specific file    ifndef   IPHONE 3 0  warning  This project uses features only available in iPhone SDK 3 0 and later    endif    ifdef   OBJC        import  lt Foundation Foundation h gt       import  lt UIKit UIKit h gt       import  YourProjectName-Swift h   endif

User · Answer

Importing Swift file inside Objective-c can cause this error  if it doesn t import properly      NOTE  You don t have to import Swift files externally  you just have to import one file which takes care of swift files   When you Created Copied Swift file inside Objective-C project  It would ve created a bridging header automatically   Check Objective-C Generated Interface Header Name at Targets - gt  Build Settings         Based on above  I will import KJExpandable-Swift h as it is     Your s will be TargetName-Swift h  Where TargetName differs based on your project name or another target your might have added and running on it     As below my target is KJExpandable  so it s KJExpandable-Swift h

User · Answer

You need to import ProductName-Swift h  Note that it s the product name - the other answers make the mistake of using the class name  This single file is an autogenerated header that defines Objective-C interfaces for all Swift classes in your project that are either annotated with  objc or inherit from NSObject  Considerations   If your product name contains spaces  replace them with underscores  e g  My Project becomes My Project-Swift h   If your target is a framework  you need to import  lt ProductName ProductName-Swift h gt   Make sure your Swift file is member of the target

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Be careful with dashes and underscores  they can be mixed up and your Project Name and Target name won t be the same as SWIFT MODULE NAME

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Checkout the pre-release notes about Swift and Objective C in the same project  https   developer apple com library prerelease ios documentation Swift Conceptual BuildingCocoaApps MixandMatch html   apple ref doc uid TP40014216-CH10-XID 75  You should be importing   import  SCLAlertView-Swift h

User · Answer

If you have a project created in Swift 4 and then added Objective-C files  do it like this    objcMembers public class MyModel  NSObject       var someFlag   false              func doSomething                      print  doing something             Reference  https   useyourloaf com blog objc-warnings-upgrading-to-swift-4

[objective-c] How can I import Swift code to Objective-C?

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