![]() ![]() I take a systematic step-by-step approach, like this: Now translate your classes from Objective-C into Swift, one at a time. A step-by-step approachīefore making any changes, start a new git branch. Having to do this can be an annoyance, especially if the Objective-C file in question has no need to know about this class, but it resolves the issue and allows compilation to proceed. h file containing the declaration for the unknown type in your Objective-C files as well, before you #import the hidden bridging header. ![]() The usual sign of trouble is that you get an “Unknown type name” compile error, where the unknown type is a class declared in Objective-C. m file you #import the hidden bridging header can make a difference. Your Objective-C files will be able to see your Swift declarations, provided you #import this hidden bridging header into each Objective-C file that needs to see them.Įxactly where at the top of a. Alternatively, examine (or change) the target’s Product Module Name build setting the hidden bridging header’s name is derived from this. This will reveal the name of the hidden bridging header. The easiest way to see this is with the following Terminal command: $ find ~/Library/Developer/Xcode/DerivedData -name "*Swift.h" If you have a bridging header, then when you build your target, the appropriate top-level declarations of all your Swift files are automatically translated into Objective-C and are used to construct a hidden bridging header inside the Intermediates build folder for this target, deep inside your DerivedData folder. h file will be visible to Swift, provided you #import it in this bridging header. Its default name is derived from the target name, but it is arbitrary and can be changed, provided you change the target’s Objective-C Bridging Header build setting to match.Īn Objective-C. When you add a Swift file to an Objective-C target, or an Objective-C file to a Swift target, Xcode offers to create a bridging header. There are two directions of visibility, and they must be considered separately. Visibility of Swift and Objective-C to one another depends upon this convention: it works through. m file needs to know about a class, it imports the corresponding. h) containing the section, and a code file (. Recall that an Objective-C class declaration is conventionally spread over two files: a header file (. Before you start, it’s a good idea to understand how this visibility works. Thus, declarations in each language will need to be visible to the other language. As soon as you add a Swift file to your Objective-C app target, you’ve got a hybrid target: some classes are written in Swift, while other other classes are written in Objective-C. You’re surely not going to translate all your code into Swift at once you’re much more likely to translate one class at a time. I’ve performed this migration with several real apps, so here are some tips culled from my actual experience. To write this native implementation, there need to be expect/actual Kotlin functions when using a common module, or just a native one when only using a native module.If you’ve got an existing app written in Objective-C, migrating it into Swift is an excellent exercise for learning Swift, experimenting with Swift, and deciding whether to adopt Swift on a full-time basis. While there is an Objective-C implementation example available and it could be queried via an interface to Xcode, surely converting this code to Kotlin would have the benefit of not convoluting the Kotlin/Swift interface. And consequently it needs to be queried via a complicated C interface. Whereas in MacOS, there is no such method. Could there be any drawbacks for using this method? Get the MacBook serial numberįor iOS, there is a convenient method to access the unique id of the device. This sounds great for developers familiar with the Jetbrains platform. ![]() Whereas for the second case, the code will be written in pure Kotlin and in IntelliJ. Because conversion would take a considerable effort. Projects who already have existing Objective-C code bases can prefer this method. Optionally use the expect/actual system.įor the first case, the native code will be written in the Xcode project in Swift/Objective-C, and returned to Kotlin via an object or interface callback.
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