AmazingCommand is a spin on classic Command design pattern with a Swift version of Target-Action design pattern on top. Together they will enable you to create commands with ease, without unnecessary repetition and no chances of accidentally creating a retencion cycle.

Let's say that you are developing financial application and you have Command pattern already applied. And it works fine for global commands like Transfer and Deposit. But now you want to create a command Export that is specific to one of the application's screens. What do you do? You create a class that implements your command protocol. And here is where the problem arise. You just created a separate class for a command that is tightly coupled with one of many screens in the application. That's where AmazingCommand comes to rescue.

import AmazingCommand

class ExportViewModel {
    
    var exportCommand: AmazingCommand<ExportViewModel, IndexPath>!
    
    init() {
        exportCommand = AmazingCommand(target: self,
                                       executeFunction: ExportViewModel.export,
                                       canExecuteFunction: ExportViewModel.canExport)
    }
    
    func export(_ parameter: IndexPath) {
        // ...
    }
    
    func canExport(_ parameter: IndexPath) -> Bool {
        let canExport = true
        
        // ...
        
        return canExport
    }
}


class ExportViewController: UIViewController, UITableViewDelegate {
    
    let viewModel = ExportViewModel()
    
    // ...
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        viewModel.exportCommand.execute(indexPath)
    }
    
    // ...
}

• macOS 10.14
• iOS 11.0
• tvOS 11.0
• watchOS 4.0
• Xcode 11
• Swift 5.0

To integrate AmazingCommand into your Xcode project using Swift Package Manager, specify it as dependency in your Package.swift:

dependencies: [
    .package(url: "https://github.com/khamitimur/AmazingCommand.git", .upToNextMajor(from: "1.0.0"))
]

This project is licensed under the MIT License.

• Any similarities with the DelegateCommand are deliberate.
• Implemenation of Target-Action design pattern in Swift was inspired by the article by Ole Begemann.