问题
I'm successfully calling my Swift classes from Objective C (for target 'MyApp') via the import statement:
#import "MyApp-Swift.h"
I've now created a new target called "MyAppLite"
When I compile the new target, I get errors because "MyApp-Swift.h" is required by the code, but the compiler is creating "MyAppLite-Swift.h"
So, I need to create a conditional Swift/ObjC header #import for the target I'm compiling against.
How can this be done, or is there a better way?
回答1:
It is also possible to set the Product Module Name setting in Build Settings to be the same across your modules (I set it to $(PROJECT_NAME)), so that the <project>-Swift.h file that is generated has the same name across all modules. This eliminates the need for adding/checking preprocessor macros.
回答2:
The best way I've found to address this issue is in your Xcode shared project settings. You can search for the following setting:
Objective-C Generated Interface Header Name*
If you set that value to a common header name, such as "MyProject-Swift.h", it will be applied to each of your targets and you can safely use the import declaration in any of your Objective-C files. This allows you to continue using unique product module names for each target, if needed.
I've tested this in Xcode Version 6.4 (6E35b).
*Note: This will appear under your Swift compiler settings, which are only visible if you have Swift source files added to your project. Additionally, if a target doesn't have any Swift source associated with it, the Swift compiler options will not be visible for that target's build settings.
Good luck!
回答3:
Previous answers have some problems if you decide to rename your targets or project, or use SWIFT_MODULE_NAME as intended.
The most universal solution is to change SWIFT_OBJC_INTERFACE_HEADER_NAME (“Objective-C Generated Interface Header Name”) under Project's, not Targets, Build Settings, to:
$(PROJECT_NAME)-Swift.h— one per project;$(SWIFT_MODULE_NAME)-Swift.h— one per module (default value).
回答4:
Well, the only way I can fix is to...
#ifdef IS_LITE
#import "MyApp_Lite-Swift.h"
#else
#import "MyApp-Swift.h"
#endif
Note that if there's any 'illegal' chars in my Product Module Name, they need to be replaced with underscores.
Hope that helps!
回答5:
I put the appropriate #import <project>-Swift.h statement in a prefix header file (<project>-Prefix.pch) defined/added for each build (target/scheme).
回答6:
The only working way is the following :
1- from first target (which has a working bridging) Build Setting select Objective C Bridging Header
2- Copy Objective C Bridging Header
3- open the other target Build Setting
4- Paste it
5- change the header file to your new header file (i.e target B.h)
(now you have this option for two target)
来源：https://stackoverflow.com/questions/26262029/objective-c-to-swift-header-file-with-multiple-targets