J2ObjC in Xcode: Setup Guide

To use J2ObjC in Xcode, you need to follow these steps for setup:

1. Firstly, make sure that J2ObjC has been installed. You can download and install the latest version from the official J2ObjC website: http://j2objc.org/
2. Create a new iOS project in Xcode. Choose the “Single View App” template or any other suitable template.
3. Open the terminal and navigate to the root directory of the project.
4. Run the following command to convert Java code to Objective-C code and generate a static library file:

$ j2objc -d <output_directory> <java_files>

In this case, is the output directory for the generated Objective-C code and static library, and are the Java code files to be converted.

1. Add the generated Objective-C code and static library files to the Xcode project. This can be done by dragging and dropping the files or using the “Add Files to…” option.
2. Select the file containing Objective-C code in Xcode, then add it to the target membership of the generated static library on the right side.
3. Use Objective-C’s JNI function to call the converted code in places where Java code is needed.

Please be aware that due to J2ObjC being an automatic translation tool, the converted code may require manual adjustments and fixes. During the conversion process, unsupported Java features or dependencies may arise. Therefore, it is recommended to conduct a code review and testing before using J2ObjC to ensure that the converted code functions properly.

Additionally, you can use the J2ObjC Gradle plugin to automate the conversion and building process. Simply add the relevant configuration to the project’s build.gradle file and use Gradle commands to execute the conversion and building operations. For more detailed information, please refer to the J2ObjC documentation.