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 here  But my problem is that Xcode haven t created the -Swift h file  only the bridging headers  So I created it  but it s actually empty  I can use all my ObjC classes in Swift  but I can t do it vice versa  I marked my swift class with  objc but it didn t help  What can I do now   EDIT  Apple says   When you import Swift code into Objective-C  you rely on an Xcode-generated header file to expose those files to Objective-C        The name of this header is your product module name followed by adding    -Swift h        Now when I want to import that File  it gives an error         MainMenu m       import  myProjectModule-Swift h    Error   myProjectModule-Swift h  file not found       implementation MainMenu   Here is my FBManager swift file    objc class FBManager  NSObject        var descr    FBManager class       init             super init              func desc            println descr             func getSharedGameState   - gt  GameState          return GameState sharedGameState     OK  GameState is written in Objective-C and no error here

User · Answer

Just include     import  myProject-Swift h  in  m or  h file  P S You will not find  myProject-Swift h  in file inspector it s hidden  But it is generated by app automatically

User · Answer

I had the same issue and it turned out special symbols in the module name are replaced by xcode   in my case dashes ended up being underscores   In project settings check  module name  to find the module name for your project  After that either use ModuleName-Swift h or rename the module in settings

User · Answer

There is two condition    Use your swift file in objective c file  Use your objective c file in swift file    So  For that purpose  you have to follow this steps    Add your swift file in an objective-c project or vice-versa  Create header  h  file  Go to Build Settings and perform below steps with search     search for this text  brid  and set a path of your header file   Defines Module   YES    Always Embed Swift Standard Libraries    YES    Install Objective-C Compatibility Header    YES     After that  clean and rebuild your project   Use your swift file in objective c file   In that case First write   objc  before your class in swift file   After that  In your objective c file  write this      import  YourProjectName-Swift h    Use your objective c file in swift file   In that case  In your header file  write this      import  YourObjective-c FileName h    I hope this will help you

User · Answer

I didnt have to change any settings in the build or add  obj to the class  All I had to do was to create bridge-header which was automatically created when I created Swift classes into Objective-c project  And then I just had to do import  quot Bedtime-Swift h quot   lt - inside objective-c file that needed to use that swift file

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sig answer is one of the best  however  it did not work for me with the old project  not new    I needed some modifications  After a lot of variations I found the recipe for me  using XCode 7 2     Product Module Name     PRODUCT NAME c99extidentifier    Defines Module   NO Embedded Content Contains Swift   NO Install Objective-C Compatibility Header   YES Objective-C Bridging Header   ProjectName-Bridging-Header h   The last point  5  was crucial  I put it only on the second section  Targets field   the Project field should be left empty   Otherwise  it did not generate the right  Project-Swift h  file for me  it did not include swift methods

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XCode 11 3 1   When I want to use an Swift inner class in a objc code  it does not compile for ther error  undefined symbol  for bother inner class and outer class   I checked the generated  -swift h  header and both classes are there   After trying for hours I convert the inner class to a normal class and it compiles   I clean the project  delete the DerivedData folder and it compiles

User · Answer

Don t create the header file yourself  Delete the one you created   Make sure your Swift classes are tagged with  objc or inherit from a class that derives  directly or indirectly  from NSObject   Xcode won t generate the file if you have any compiler errors in your project - make sure your project builds cleanly

User · Answer

Make sure your project defines a module and you have given a name to the module  Then rebuild  and Xcode will create the -Swift h header file and you will be able to import   You can set module definition and module name in your project settings

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I just discovered that adding a directory of swift files to a project won t work   You need to create a group first for the directory  then add the swift files

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For Swift 5    Add the  objc keyword to your class and methods Add public keyword to your class and methods Let your class inherit from NSObject Build Project Put  import  MyProject-Swift h  in your Objective-C file   objc public class MyClass  NSObject         objc     public func myMethod

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Also probably helpful for those of you with a Framework target   The import statement of the auto-generated header file looks a bit different from app targets  In addition to the other things mentioned in other answers use   import  lt ProductName ProductModuleName-Swift h gt    instead of   import  ProductModuleName-Swift h    as per Apples documentation on Mix  amp  Match for framework targets

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my problem was I got stuck after xcode created the bridge file but still I got error in header file name  MYPROJECTNAME-swift h   1 I check in terminal and search for all auto created swift bridge files   find   library Developer Xcode DerivedData  -name   -Swift h  xargs basename sort -  you see what xcode created    in my case  I had space in my project name and xcode replace this is

User · Answer

Allow Xcode to do its work  do not add create Swift header manually  Just add  objc before your Swift class ex     objc class YourSwiftClassName  UIViewController   In your project setting search for below flags and change it to YES  Both Project and Target   Defines Module   YES Always Embed Swift Standard Libraries   YES Install Objective-C Compatibility Header   YES   Then clean the project and build once  after build succeed  it should probably  import below header file in your objective-c class  m file   import  YourProjectName-Swift h     Boooom

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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   lt  YourProjectName  gt -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  lt product name gt -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 - gt  select a target - gt  General - gt  Linked Frameworks and Libraries - gt  add - gt  Add Others    - gt  point to  lib lt product name gt  a  file   or Project editor - gt  select a target - gt  Build Phases - gt  Link Binary With Libraries - gt  add - gt  Add Others    - gt  point to  lib lt product name gt  a  file   Add Library Search paths Library not found for   Recursive path   Project editor - gt  select a target - gt  Build Settings - gt  Search Paths - gt  Library Search paths - gt  add path to the parent of  lib lt product name gt  a  file   Add Header Search Paths Module not found   Recursive path   Project editor - gt  select a target - gt  Build Settings - gt  Search Paths - gt  Header Search Paths - gt  add path to generated   lt product name gt -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 - gt  select a target - gt  Build Settings - gt  Swift Compiler - General - gt  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

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Details  Objective-C project with Swift 3 code in Xcode 8 1 Tasks   Use swift enum in objective-c class Use objective-c enum in swift class  FULL SAMPLE 1  Objective-C class which use Swift enum  ObjcClass h   import  lt Foundation Foundation h gt   typedef NS ENUM NSInteger  ObjcEnum        ObjcEnumValue1      ObjcEnumValue2      ObjcEnumValue3      interface ObjcClass   NSObject     void  PrintEnumValues    end   ObjcClass m   import  quot ObjcClass h quot   import  quot SwiftCode h quot    implementation ObjcClass     void  PrintEnumValues        self PrintEnumValue SwiftEnumValue1        self PrintEnumValue SwiftEnumValue2        self PrintEnumValue SwiftEnumValue3         void  PrintEnumValue  SwiftEnum  value       switch  value            case SwiftEnumValue1              NSLog   quot -- SwiftEnum  SwiftEnumValue1 quot                break                       case SwiftEnumValue2          case SwiftEnumValue3              NSLog   quot -- SwiftEnum  long value    ld quot    long value               break            end  Detect Swift code in Objective-C code In my sample I use SwiftCode h to detect Swift code in Objective-C  This file generate automatically  I did not create a physical copy of this header file in a project   and you can only set name of this file     If the compiler can not find your header file Swift code  try to compile the project   2  Swift class which use Objective-C  enum import Foundation   objc enum SwiftEnum  Int       case Value1  Value2  Value3     objc class SwiftClass  NSObject            class func PrintEnumValues             PrintEnumValue  Value1          PrintEnumValue  Value2          PrintEnumValue  Value3                 class func PrintEnumValue value  ObjcEnum            switch value           case  Value1   Value2              NSLog  quot -- ObjcEnum  int value     value rawValue  quot                        case  Value3              NSLog  quot -- ObjcEnum  Value3 quot               break                             Detect Objective-C code in Swift code You need to create bridging header file  When you add Swift file in Objective-C project  or Objective-C file in swift project Xcode will suggest you to create  bridging header   You can change bridging header file name here    Bridging-Header h   import  quot ObjcClass h quot   Usage  import  quot SwiftCode h quot       ObjcClass PrintEnumValues    SwiftClass PrintEnumValues    SwiftClass PrintEnumValue ObjcEnumValue3    Result   MORE SAMPLES  Full integration steps Objective-c and Swift described above  Now I will write some other code examples   3  Call Swift class from Objective-c code  Swift class  import Foundation   objc class SwiftClass NSObject            private var  stringValue  String     var stringValue  String           get               print  quot SwiftClass get stringValue quot               return  stringValue                   set               print  quot SwiftClass set stringValue     newValue  quot                stringValue   newValue                          init  stringValue  String            print  quot SwiftClass init String  quot            stringValue   stringValue                func printValue             print  quot SwiftClass printValue   quot           print  quot stringValue      stringValue  quot                  Objective-C code  calling code   SwiftClass  obj     SwiftClass alloc  initWithStringValue    quot Hello World  quot     obj printValue   NSString   str   obj stringValue  obj stringValue     quot HeLLo wOrLd    quot    Result  4  Call Objective-c class from Swift code  Objective-C class  ObjcClass h    import  lt Foundation Foundation h gt    interface ObjcClass   NSObject  property NSString  stringValue  -  instancetype  initWithStringValue  NSString  stringValue  -  void  printValue   end   ObjcClass m   import  quot ObjcClass h quot    interface ObjcClass     property NSString  strValue    end   implementation ObjcClass  -  instancetype  initWithStringValue  NSString  stringValue       NSLog   quot ObjcClass initWithStringValue quot         strValue   stringValue      return self     -  void  printValue       NSLog   quot ObjcClass printValue quot        NSLog   quot stringValue      quot    strValue      -  NSString   stringValue       NSLog   quot ObjcClass get stringValue quot        return  strValue     -  void  setStringValue  NSString  newValue       NSLog   quot ObjcClass set stringValue      quot   newValue        strValue   newValue      end   Swift code  calling code   if let obj   ObjcClass stringValue    quot Hello World  quot         obj printValue       let str   obj stringValue      obj stringValue    quot HeLLo wOrLd    quot      Result  5  Use Swift extension in Objective-c code  Swift extension  extension UIView       static func swiftExtensionFunc             NSLog  quot UIView swiftExtensionFunc quot             Objective-C code  calling code    UIView swiftExtensionFunc    6  Use Objective-c extension in swift code  Objective-C extension  UIViewExtension h    import  lt UIKit UIKit h gt    interface UIView  ObjcAdditions     void objcExtensionFunc   end   UIViewExtension m   implementation UIView  ObjcAdditions     void objcExtensionFunc       NSLog   quot UIView objcExtensionFunc quot       end   Swift code  calling code   UIView objcExtensionFunc

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The file is created automatically  talking about Xcode 6 3 2 here   But you won t see it  since it s in your Derived Data folder  After marking your swift class with  objc  compile  then search for Swift h in your Derived Data folder  You should find the Swift header there   I had the problem  that Xcode renamed my my-Project-Swift h to my Project-Swift h Xcode doesn t like      -  etc  symbols  With the method above you can find the filename and import it to a Objective-C class

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I had the same problem and finally it appeared that they weren t attached to the same targets   The ObjC class is attached to Target1 and Target2  the Swift class is only attached to the Target1 and is not visible inside the ObjC class   Hope this helps someone

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I use CocoaPods and the Swift class from my library couldn t be located from the Objective-C code in the example app because it s project and target were named the same as the library  so I had to remove the Objective-C Generated Interface Name values so they didn t conflict with the ones from the library

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I have the same error  myProjectModule-Swift h file not found   but  in my case  real reason was in wrong deployment target   Swift is unavailable on OS X earlier than 10 9  please set MACOSX DEPLOYMENT TARGET to 10 9 or later  currently it is  10 7    so  when I ve changed deployment target to 10 9 - project had been compiled successfully

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In my case  apart from these steps    Product Module Name   myproject Defines Module   YES Embedded Content Contains Swift   YES Install Objective-C Compatibility Header   YES Objective-C Bridging Header     SRCROOT  Sources SwiftBridging h   I have needed to put the class as public in order to create productName-Swift h file   import UIKit      objc public class TestSwift  NSObject          func sayHello               print  Hi there

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I had issues in that I would add classes to my objective-c bridging header  and in those objective-c headers that were imported  they were trying to import the swift header   It didn t like that   So in all my objective-c classes that use swift  but are also bridged  the key was to make sure that you use forward class declarations in the headers  then import the   -Swift h  file in the  m file

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My issue was that the auto-generation of the -swift h file was not able to understand a subclass of CustomDebugStringConvertible   I changed class to be a subclass of NSObject instead   After that  the -swift h file now included the class properly

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I spent about 4 hours trying to enable Swift in my Xcode Objective-C based project  My myproject-Swift h file was created successfully  but my Xcode didn t see my Swift-classes  So  I decided to create a new Xcode Objc-based project and finally  I found the right answer  Hope this post will help someone  -   Step by step Swift integration for Xcode Objc-based project    Create new   swift file  in Xcode  or add it by using Finder  Create an Objective-C bridging header when Xcode asks you about that  Implement your Swift class   import Foundation     use  objc or  objcMembers annotation if necessary class Foo               Open Build Settings and check these parameters    Defines Module   YES     Copy  amp  Paste parameter name in a search bar  Product Module Name   myproject      Make sure that your Product Module Name doesn t contain any special characters  Install Objective-C Compatibility Header   YES     Once you ve added   swift file to the project this property will appear in Build Settings  Objective-C Generated Interface Header   myproject-Swift h     This header is auto-generated by Xcode  Objective-C Bridging Header     SRCROOT  myproject-Bridging-Header h  Import Swift interface header in your   m file    import  myproject-Swift h       Don t pay attention to errors and warnings   Clean and rebuild your Xcode project  Profit

User · Answer

When you add new Swift files to the project  please  make sure that you add them to correct targets  Please  make sure that every swift file you re going to use inherits NSObject class and annotated with  ObjCMembers Change to YES inside the build settings under the option ALWAYS EMBED SWIFT STANDARD LIBRARIES  Change to YES inside the build settings under the option DEFINES MODULE

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After doing everything above  I still got errors  My problem ended up being that the Swift files I needed weren t added to the bundle resources for some reason   I fixed this by going to  MyTarget    Build Phases   Copy Bundle Resources  then clicked the plus button and added the Swift files

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well  after reading all the comments and trying and reading and trying again  I managed to include swift classes into my Big obj-c project  So  thanks for all the help  I wanted to share one tip that helped me understand the process better  In the  m class  went to the import line of the swift target name  import  myTargetName-Swift h  and clicked the key   command   mouse click -  Jump to definition   There you can see all the translation from swift to obj-c and ther you will find the various functions re-declared in obj-c  Hope this tip will help you as much as it helped me

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