问题
I have an existing Obj-C project that houses many targets that all share the same AppDelegate. I want to bridge a swift class that is used by select targets. I can do this easily when I have one target.
When I add a swift file to the project, I select the desired targets and the necessary bridging-header.h files are generated, but when I try to import those -swift.h files, they are can't be found.
Are there steps I'm missing when it comes to projects that have multiple build targets?
EDIT - More Details
I wanted to add a little bit more detail on how my project is set up.
I have a Framework, we'll call it AppFactory, coded in Obj-C. I have multiple build targets that generate different versions of the Core app depending on information in that target's plist. I want a swift file to be utilized by these apps. In my build settings the Defines Module is marked to Yes, I have create this swift class:
@objec class SwiftClass: NSObject {
}
And in doing that, Xcode generated the proper Briding-Header.h files.
According to Apple Guides when you have multiple build targets your import header should include the ProductName/ProductModuleName-Swift.h, which should be auto generated by Xcode.
When I look in to my derived data folder, the ProductModuleName-Swift.h does exist, with in each targets build folder, under the AppFactoryCore folder.
回答1:
I found a solution to my problem.
Swift File Targets: Instead of having SwiftClass.swift target both the framework and the selected targets (AppA, AppB & AppC), I backpedaled and solely targeted the framework, AppFactoryCore.
Build Settings (Packaging > Defines Module):
I reverted each app target's Defines Module property from YES to NO, and set this property to YES for the framework target.
Swift Class Declaration: The guide states:
Because the generated header for a framework target is part of the framework’s public interface, only declarations marked with the public or open modifier appear in the generated header for a framework target.
So I added access control modifiers to my class and class functions
@objc open class SwiftClass: NSObject {
//Code
}
Import Header: Since SwiftClass.swift is only targeting the framework target, and it is in fact a framework that is being used, the header import SwiftClass.swift into the universal AppDelegate was
#import <AppFactoryCore/AppFactoryCore-Swift.h>
Which finally became visible once all previously stated modifications were done.
Now that the file is global to all targets I added a custom attribute to identify if the target running was is one that should utilize SwiftClass.swift.
Hope this helps anyone else trying to accomplish a relatively similar task!
来源：https://stackoverflow.com/questions/43599970/adding-swift-class-to-objective-c-project-with-multiple-targets