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This Library provides many common tools to work with writing App.
Swift Package Manager
Once you have your Swift Package set up, you add this code to your Package.swift.
dependencies: [ .package(url: "https://github.com/LoniQin/swift-foundation-lib", .upToNextMajor(from: "1.0.0")) ]
In Xcode, you can choose File->Swift Packages->Add Pakcage dependancies, and add https://github.com/LoniQin/swift-foundation-lib.