I have a Xcode project with Obiective-c files and swift files, Now i want to create a framework with both classes, Is this possible ?
Yes, this is straightforward and the process is documented by Apple. Please read "Swift and Objective-C in the Same Project" with thought and you'll be wiser (the section "Importing Code from Within the Same Framework Target" covers importing Objective-C in Swift from the same target, and the other way). Briefly…
For framework targets you don't need to create a bridging header to make your Objective-C importable to Swift, you just need to #import those headers you want visible to Swift in the framework's umbrella header. For that to work, the header needs to be marked public.
For Swift to be importable in Objective-C in the same framework target, make sure "Defines Module" is toggled on for the target, and in the files where you need to reference the Swift types, do an import in the style #import <ProductName/ProductModuleName-Swift.h>. If I recall this right, the Swift types / methods / properties you want to access from Objective-C will need to have been declared public for it to be accessible to Objective-C code even if it's in the same target.
Related
I would like to use a Swift library in my Objective-C IOS app. I have the Swift library setup as a separate project, which builds fine in XCode. I can drag the generated Swift framework from the Swift project into the "Frameworks, Libraries and embedded content" list of my Objective-C project target. It appears with an "Embed & Sign" label.
The Apple description here: https://developer.apple.com/documentation/swift/importing-swift-into-objective-c states that
You can work with types declared in Swift from within the Objective-C
code in your project by importing an Xcode-generated header file. This
file is an Objective-C header that declares the Swift interfaces in
your target, and you can think of it as an umbrella header for your
Swift code. You don’t need to do anything special to create the
generated header—just import it to use its contents in your
Objective-C code.
When I look inside the swift .framework file, I can see the header file there. But when I import it in one of my Objective-c .m files, then the compiler says that the file is not found. I have tried both the
#import "Starscream-Swift.h"
and the
#import <Starscream/Starscream-Swift.h>
syntax.
How can I convince XCode to use the header file from the Swift framework? Do I need to copy that header somewhere, maybe? And what else do I need to think about to use a Swift library from an Objective-c IOS app?
I am using XCode version 13.4.1.
By the way, the Swift library I am trying to use is Starstream.
Xcode-generated header file is required when your own project has Objective-C and Swift classes mixed. When dealing with frameworks you either include the framework's umbrella header like this:
#import "SwiftFramework/SwiftFramework.h"
Or, more preferably, you import it with #import expression:
#import SwiftFramework;
Be advised, that only part that is exposed to Objective-C runtime is accessible from this framework (i.e. public/open classes inherited from NSObject or some other Cocoa classes)
How to use Obj-C Framework code in Swift Framework?
Is it possible or I need to mix them in a single Framework?
I have code for both Frameworks. I connect them manually without CocoaPods, Carthage or Swift Package Manager. Bridging header cannot be used inside of a Framework, only in App Target. Google says that I need to use modulemap file. In all examples I found they create their own modulemap files and put them near the Swift framework code. I tried to use both my own modulemap file and existing one inside ObjCFramework.framework/Modules. I use them by adding a path to the modulemap file to SWIFT_INCLUDE_PATHS build setting of my Swift Framework. I also tried to #import Obj-C Frameworks Ubrella Header to Swift Frameworks Ubrella Header with no luck. Of course I added the Obj-C Framework target to my Swift Framework target dependencies, the framework itself to Frameworks and Libraries and the path to it to Framework Search Paths. I didn't put anything to Header Search Paths to avoid "Include of non-modular header inside framework module", but that didn't help. CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES build setting doesn't help too. DEFINES_MODULE is set to YES.
Now I'm in endless loop of several errors:
Include of non-modular header inside framework module 'ObjCFramework': '/Users/bond/Library/Developer/Xcode/DerivedData/SwiftFramework-aqidpocynynsvdgtrqwukanwqkxf/Build/Products/Debug-iphoneos/ObjCFramework.framework/Headers/View.h'
Module 'ObjCFramework' was built in directory '/Users/bond/Library/Developer/Xcode/DerivedData/SwiftFramework-aqidpocynynsvdgtrqwukanwqkxf/Build/Products/Debug-iphoneos/ObjCFramework.framework' but now resides in directory '/Users/bond/Library/Developer/Xcode/DerivedData/SwiftFramework-aqidpocynynsvdgtrqwukanwqkxf/Build/Products/Debug-iphoneos/ObjCFramework.framework/Modules'
No such module ObjCFramework
underlying Objective-C module not found
In brief this is described here: https://developer.apple.com/documentation/swift/imported_c_and_objective-c_apis/importing_objective-c_into_swift, "Import Code Within a Framework Target" chapter.
If the Defines Module setting is turned on in your framework target, modern Xcode puts Modules folder in the framework, with Swift versions of all you ObjC public interfaces, making ObjC stuff available either for external Swift code that links your framework or Swift code of the framework itself.
This does not depend on whether your framework target contains any swift code.
Just add you ObjC header to framework target, mark it as Public in "Target membership", include in framework Umbrella header and build.
In an iOS application I have a subproject (not cocoapods) in which I have included a swift file and ObjC file (that is used by the swift file). XCode automatically created a bridging file but could not build it because apparantly bridging is not allowed in a framework. The workaround that I used was to add the objective-c header to the umbrella file and it worked. Now I need to use a swift class from ObjC. I have define module to set to YES, the generated file Framework-Swift.h . But when I try to import it in objective-c i get
Could not build Objective-C module
The closest I got after some googleing was this answer:
Ah gotcha. It looks like you're building a mixed Swift & Objective-C
pod - if that's the case, Xcode will try to import
within the generated -Swift.h header.
You'll need to create the header manually and add imports for the
Objective-C classes that you want to expose to Swift.
CocoaPods generates an umbrella header automatically and imports it
within the .modulemap, but Xcode doesn't use that when generating the
-Swift.h header
But I am unsure what header needs to be created manually.
Any ideeas or pointer about using swift in an objective-c framework ? In both ways ?
I also had similar issue when using Swift pods in my Swift project containing several targets. No Objective-C code at all. I tried to clear build folder, pods cache, derived data - nothing worked.
Solution:
Open the Build Settings for a target that contains your module code. Set the "Install Objective-C Compatibility Header" to "No"
There's a great and simple article that wraps up this case:
DEFINES_MODULE=YES
To use ObjC classes in Swift, create a bridging header and specify path to it in the build settings
To use Swift classes in ObjC, #import <ModuleName/ModuleName-Swift.h> in your *.m file (use #class SwiftClass; forward declaration in *.h file, if needed)
For swift classes and their members to be visible to objc
inherit your class from NSObject
prepend it with #objcMembers
make both the class and its members public
I have created a dynamic framework with Swift language. In this framework I am using mailcore2-ios that was build by Objective-C code. So how can I use it in swift file of my framework?
I try "public" and add a header .h file to umbrella but it still not work, have so much error for other header file as the image what I attach.
Xcode does not allow the use of bridging headers in framework targets. You should use the methods described here : http://iosdeveloperzone.com/2014/10/03/using-commoncrypto-in-swift/
I have framework that is written in ObjC and Swift, I want to use ObjC classes in Swift. Apple says "In your umbrella header file, import every Objective-C header you want to expose to Swift". But everything included to umbrella becomes public. Is there any way to use ObjC without making it public?
The umbrella header is not your framework header, it's the one named with "-Swift.h" in it. You don't need to include that header in your main framework header.