Swift Package Examples

Collection of examples creating and using Swift Packages and the Swift Package Manager.

HelloWorld Swift Package

Created via swift package init.
Removed Linux specific testing stuff.
- LinuxMain.swift
- XCTestManifests.swift
- HelloWorldTests.allTests
- This might not be required for Linux in the future: https://forums.swift.org/t/pitch-enable-test-discovery-by-default/36619
Implemented some simple behavior, including tests.
Test can be run via command line swift test.
Made sure to mark functionality (functions, properties, etc.) as public.
- This includes an empty public init() in order to initilize the class from outside of the package.

Created by hand.
- This means I had to create the gitignore file by hand as well.
Created a label subclass, which required to import UIKit.
- Importing UIKit breaks swift build and swift test on the command line.
- The package itself and all consumers require Xcode from now on.
- You have to select an iPhone Simulator to build, My Mac no longer works.
Added .iOS(.v13) as plattform.
Added HelloWorld package as dependency.
Implemented basic functionality.

Created by hand, with two products and two targets.
Using different names for folder, package, targets and products.
Added as dependency to the HelloLabel package.
- Because of the differnt names and multiple products, the definition of dependecy is bit more complex.
- See commit 9dc83ad7
Insights gathered from this experience:
- Under dependencies you have the mention to location of the package.
  - You also have to mention the package name if it is differnt from the folder name.
- Under target/dependencies you have to name the product.
  - You also have to name the package if it has a different name or if there are multiple products withint the same package.
- When using the import statement in your code, you have to mention the module, which is identical to the target.