Tuesday, July 5, 2022
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Introduction to SPM artifact bundles


XCFrameworks and SPM

Earlier than the introduction of the brand new format we needed to fiddle with FAT binaries to assist a number of platforms. I’ve a deep dive article about frameworks and instruments that you need to use to assemble a FAT binary, however I now not suggest it since XCFrameworks are right here to remain. 🔨


With the intention to construct an XCFramework, it’s important to use Xcode and a course of may be very easy. You simply have to pick the Framework sort below the iOS tab once you create a brand new venture. Be at liberty to call it, add your Swift supply code and that is it.


You may construct this venture utilizing the command line for a number of platforms by way of the next script.



xcodebuild archive 
  -scheme MySDK 
  -sdk iphoneos 
  -archivePath "construct/ios_devices.xcarchive" 
  BUILD_LIBRARY_FOR_DISTRIBUTION=YES 
  SKIP_INSTALL=NO
  

xcodebuild archive 
  -scheme MySDK 
  -sdk iphonesimulator 
  -archivePath "construct/ios_simulators.xcarchive" 
  BUILD_LIBRARY_FOR_DISTRIBUTION=YES 
  SKIP_INSTALL=NO


xcodebuild archive 
  -sdk macosx MACOSX_DEPLOYMENT_TARGET=11.0 
  -arch x86_64 -arch arm64 
  BUILD_LIBRARY_FOR_DISTRIBUTION=YES 
  -scheme "MySDK" 
  -archivePath "construct/macos_devices.xcarchive" SKIP_INSTALL=NO


xcodebuild -create-xcframework 
  -framework construct/ios_devices.xcarchive/Merchandise/Library/Frameworks/MySDK.framework 
  -framework construct/ios_simulators.xcarchive/Merchandise/Library/Frameworks/MySDK.framework 
  -framework construct/macos_devices.xcarchive/Merchandise/Library/Frameworks/MySDK.framework 
  -output MySDK.xcframework


You may even construct variations for Catalyst and different working techniques, if you perform a little search you possibly can simply determine the required parameters and configuration. Lengthy story quick, it’s totally straightforward to create an xcframework output together with all form of platform slices for particular gadgets. 😊


Now if you wish to use this XCFramework, you possibly can merely drag and drop it to your Xcode venture and it ought to work with out additional points (if it incorporates the mandatory slices). Alternatively you need to use Swift package deal supervisor and create a binary goal an hook up your exterior framework bundle by way of SPM. That is how a quite simple configuration file seems to be like.



import PackageDescription

let package deal = Package deal(
    title: "MySDK",
    merchandise: [
        .library(name: "MySDK", targets: ["MySDK"]),
    ],
    dependencies: [
        
    ],
    targets: [
        .binaryTarget(name: "MySDK", path: "./MySDK.xcframework")
    ]
)


In your venture you need to use the library product as an ordinary dependency, and the underlying binary goal will handle importing the mandatory header information and linking the precise library. The one drawback with this strategy is that it’s macOS (or to be much more exact Apple OS solely).

Say howdy to artifact bundles for Swift PM


All proper, so XCFrameworks cannot be used below Linux, however folks like to jot down command line scripts in Swift and use them for server facet initiatives. In some instances these scripts (or plugins), wish to name exterior scripts that aren’t put in on the system by default. That is the place artifact bundles can assist, as a result of it makes attainable to ship a number of variations of the identical executable binary file. 🤔


Artifact bundles will not be a substitute for xcframeworks, however extra like an addition, or enchancment because the proposal title signifies this, for the Swift package deal supervisor plugin structure. They permit us to ship precompiled binary information for a number of platforms, this manner plugin authors do not need to compile these instruments from supply and the plugin execution time will be closely diminished.


There’s a nice weblog put up about wrapping the SwiftLint executable in an artifact bundle, so I do not actually need to get into the small print this time, as a result of it is fairly simple. The proposal itself helps lots to grasp the fundamental setup, additionally the older binary dependencies proposal incorporates some associated data good job Swift crew. 👍


I might like to present an honorable point out to Karim Alweheshy, who’s actively working with the brand new Swift package deal supervisor plugin infrastructure, he has an wonderful repository on GitHub that demos artifact bundles so please have a look when you have time. 🙏


Anyway, I will present you tips on how to wrap an executable into an artifact bundle. At the moment there is no option to wrap libraries into artifact bundles, that is going to be added afterward.



mkdir MyApp
cd $_
swift package deal init --type=executable


swift construct -c launch


cp $(swift construct --show-bin-path -c launch)/MyApp ./myapp



mkdir MyPluginExample
cd $_
swift package deal init 

mkdir myapp.artifactbundle
cd $_
mkdir myapp-1.0.0-macos
cd $_
mkdir bin


Now the file construction is prepared, we must always create a brand new data.json file below the artifactbundle listing with the next contents. This can describe your bundle with the accessible binary variants, you possibly can check out the proposals for the accessible triplets variations.


{
    "schemaVersion": "1.0",
    "artifacts": {
        "myapp": {
            "model": "1.0.0",
            "sort": "executable",
            "variants": [
                {
                    "path": "myapp-1.0.0-macos/bin/myapp",
                    "supportedTriples": ["x86_64-apple-macosx", "arm64-apple-macosx"]
                }
            ]
        }
    }
}


Copy the myapp binary below the myapp-1.0.0-macos/bin/myapp location, and at last we will make a quite simple command plugin to take advangate of this newly added instrument.


import PackagePlugin
import Basis

@essential
struct MyDistCommandPlugin: CommandPlugin {
    
    func performCommand(context: PluginContext, arguments: [String]) throws {
        let myAppTool = attempt context.instrument(named: "myapp")
        let myAppToolURL = URL(fileURLWithPath: myAppTool.path.string)

        let course of = attempt Course of.run(myAppToolURL, arguments: [])
        course of.waitUntilExit()
    }
}


Watch out with the paths and file names, I used lowercase letters for all the pieces on this instance, I like to recommend to comply with this sample once you create your artifact bundle binaries.


swift package deal plugin --list
# ‘howdy’ (plugin ‘HelloCommandin package deal ‘MyPluginExample’)
swift package deal howdy
# Hiya, world!


That is it, now we have a working artifact bundle with a customized made executable accessible for macOS. We are able to use this artifact bundle as a dependency for a plugin and run the instrument through the use of the plugin APIs. I might actually love to have the ability to cross compile Swift libraries and executable information afterward, this might make the event / deployment workflow a bit easier. Anyway, artifact bundles are a pleasant little addition, I actually like the way in which you possibly can ship binaries for a number of platforms and I hope that we’re going to have the ability to share libraries as effectively similarly. 😊




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