I'm facing a problem trying to write a test for class written in Objective-c and gets injected with a class written in Swift.
Example in the Test file:
SomeSwiftClass *swiftVar = [SomeSwiftClass new];
SomeObjectiveCClass *objVar = [[SomeObjectiveCClass alloc] initWithSwiftClass:swiftVar]
But the complier doesn't recognize the Swift class, and it doesnt support importing the "Target-Swift.h" too..
How can I write a test for both Objective c and Swift at the same TestFile ?
There are quite a few things that need to be in place if you want to use a Swift class in Objective-C.
The bridging header is required "Target-Bridging-Header.h"
Precede the class definition with #objc in the .swift file.
If you're still stuck, try deleting your .swift files and adding them to the project again, and Xcode will ask to generate the bridging header for you.
Check out the documentation: https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html#//apple_ref/doc/uid/TP40014216-CH10-ID138
Or this link:
Swift to Objective-C header not created in Xcode 6
I managed to get it working, so if you post more of your code or share what you're doing I might be able to help.
Related
In my Swift Project, I added a new cocoa Objective-C class (UIViewController), Xcode prompted me whether I want it to automatically generate an Objective-C bridging header file.
I am a bit confused because the generated file is ProductModuleName-Bridging-Header.h while, as per Apple documentation, I was waiting to get a ProductModuleName-Swift.h instead (In order to import Swift into Objective-C).
The ProductModuleName-Bridging-Header.h is mandatory in order to be able to import Objective-C from Swift, and not the inverse.
Any clarification on this?
Thanks
The behavior you describe is exactly correct. You're adding Obj-C to your Swift project, therefore Xcode offers to create a -Bridging-Header.h file which allows that imported Obj-C to be used in your Swift code. This is described in the documentation you linked under "Importing Objective-C into Swift".
Unlike the bridging header, the -Swift.h file doesn't appear in your file hierachy, and is not something you see or edit. It's generated and managed entirely by Xcode during the build process. You simply import into .m files when needed.
Xcode does not generate this -Swift.h header file when the project is a Swift project. The documentation says:
When you import Swift code into Objective-C, you rely on an
Xcode-generated header file to expose those files to Objective-C. This
automatically generated file is an Objective-C header that declares
the Swift interfaces in your target. It can be thought of as an
umbrella header for your Swift code. The name of this header is your
product module name followed by adding "-Swift.h".
If I try to include the -Swift.h file anyway, it says file not found.
I've been able to generate this file before in an Objective-C project.
But I want to call Swift from Objective-C, in a Swift project.
How do I call Swift from Obj-C in a Swift project?
Thanks!
If the Objective-C file in which you import *-Swift.h is in the same Swift target that contains the Swift code you are trying to use in Objective-C, you should have no trouble importing it. To make sure you are using the correct name, check the Objective-C Generated Interface Header Name under Build Settings. If the target is a framework, you may need to import the -Swift.h header a little differently:
#import "YourFrameworkModuleName/YourFrameworkModuleName-Swift.h"
whereas in an application target you would just do
#import "YourAppModuleName-Swift.h"
This is something I found from my experience.
Note: I know How to call Objective-C code from Swift, but I don't know below,
I want to use this EsptouchForIOS's Demo in my project. The demo is write in OC, it has a storyboard and controller. I want to know how to integrate the demo in my swift project, and use that storyboard and it's controller in my swift project.
I'll start writing from the very beginning. Suppose you have a project in Objective-C and now you want to continue your project's development in Swift. Follow the below guidelines: (This intends to your specific needs)
First choose to add a new file from File->New->File. In this process select your language as Swift. In the final step here, you will be prompted to Create Bridging Header. Select that:
Now build your project once (⌘+B). You may get an error like this:
Change your target's minimum deployment to the version that Swift supports. (Example in the below screenshot)
To use Objective-C resources in Swift files:
Now that you've got one ProjectName-Bridging-Header.h file in your project. If you want to use any Objective-C class in your Swift files, you just include the header file of that class in this bridging header file. Like in this project, you have ESP_NetUtil and ESPViewController class and their header files too. You want to expose them to Swift and use them later in Swift code. So import them in this bridging header file:
Build once again. Now you can go to your Swift file. And use the Objective-C classes as like you use any resource in swift. See:
N.B: You must expose all the class headers (that you're intending to use later in Swift) in that bridging header file
To use Swift resources in Objective-C files:
Now you may wonder, I've successfully used Objective-C resources in Swift. What about the opposite? Yes! You can do the opposite too. Find your Target->Build Settings->Swift Compiler - General->Objective-C Generated Interface Header Name. This is the header file you will be using inside your Objective-C classes for any Swift to Objective-C interoperability. To know more check here.
Now inside any of your Objective-C class, import that interface header and use Swift resources in Objective-C code:
You will get more understanding from the official apple documentation.
You can checkout the worked out version of your linked project here with Objective-C-Swift interoperability.
So according to your question, you have added an objective C bridge in your swift project using How to call Objective-C code from Swift.
Now, import all headers (.h) files of your objective-c source code (demo project) that you want to direct use in swift file.
For example, your demo project has EsptouchForIOS following header (file with extension .h) files in project source code.
ESPAppDelegate.h, ESPDataCode.h, ESPTouchDelegate.h
import a header file in your bridge, which you want to use in your swift code. Suppose in your swift code you want touch delegate ESPTouchDelegate then write,
#import "ESPTouchDelegate.h"
Here is snapshot of your demo integration in my Test Swift project with bridge
and import statements.
Now, there is function/method in an objective C file getValue
which is used/accessed in swift project/file.
Similarly, you can import as many files (source headers) as you want in bridge and use the same files (source code) in swift.
I have never tried to use objective-c from swift project. But I normally used swift classes from my objective-c project. I usually follow this instructions https://developer.apple.com/library/content/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html from apple developer website.
I have an Objective-c file which used to work with the older XCode's
with the emergence of XCode 6.x - code no longer performs
I found the same functionality in code written in Swift online
I read Apple's documentation about using bridging header's to allow the use of Swift with Objective-C. I was able to get that setup ok, I do believe.
What is not clear is - can I simply cut and paste the Swift code into my Objective-C file (a viewcontroller.me file actually), or am I limited to having to use a Swift file from the start ?
If I have to use a new file in my (very simple) app, Im not quite sure how to pull off having two viewcontroller.m files do the work where one used to work fine, so this method obviously creates a new problem for me.
Thanks for your assistance in advance !
I would recommend just creating a class or struct for your swift code, and access that class or struct in your Objective-C ViewController.
I have an existing framework & bundle written in Objective-C and would like to access it in Swift.
How would I go about doing that?
Here's what I got:
1) Attempting to import the ObjC framework. Notice that I'm not successful.
Within the Objective-C framework project... attempting to make it usable for Swift.
I set the 'Defines Module' to YES:
I setup the bridge header within the ObjC framework app:
Yet I'm unable to access the framework. Apparently Xcode 6.1.1 doesn't convert the Objective-C to an importable Swift framework interface.
What am I missing?
Firstly, make sure your objective-c code is up to date
Then you add your objective-c code to your project, xcode will automatically ask you if you want to create a bridging header.
In your bridging header file, you just need to include your objective-c header files
example:
#import MyClass.h
save your header, and after that, you can test by trying to use your objective-c classes inside your swift code base