Implementing Swift Package Manager –Example 1

Simple, Single-Package, Static Library

In this example, the PackageConsumer utility simply consumes Package_A, Version 1.0.0.

Here is the GitHub link to the PackageConsumer project Version 1.0.0. You can check out that version, and reproduce the results here.

Here is the source code for Package_A, version 1.0.0:

import Foundation

public protocol PackageProtocol {
    var text: String { get }
    var indent: Int { get }
}

public struct Package_A: PackageProtocol {
    public let indent: Int
    public let text: String
    public init(indent inIndent: Int = 0) {
        indent = inIndent
        let prefix = String(repeating: "\t", count: inIndent)
        text =  "\(prefix)Package_A, Version: 1.0.0"
    }
}

And here is its Package.swift file:

import PackageDescription

let package = Package(
    name: "Package_A",
    platforms: [
        .iOS(.v11),
        .tvOS(.v11),
        .macOS(.v10_14),
        .watchOS(.v5)
    ],
    products: [
        .library(
            name: "Package-A",
            targets: ["Package_A"]),
    ],
    targets: [
        .target(
            name: "Package_A",
            dependencies: []),
        .testTarget(
            name: "Package_ATests",
            dependencies: ["Package_A"]),
    ]
)

And this is the PackageConsumer.swift file:

import Foundation
import Package_A

struct PackageConsumer {
    let text: String
    init(text intext: String = "PackageConsumer, Version 1.0.0") {
        text = intext + "\n" + Package_A(indent: 1).text
    }
}

If we start up Xcode, and run the command-line utility, we will get something that looks like this, in the debug console:

PackageConsumer, Version 1.0.0
	Package_A, Version: 1.0.0