Viperit

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Viper Framework for iOS using Swift

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![Viperit](https://raw.githubusercontent.com/ferranabello/Viperit/master/Assets/logo_light.png)

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Write an iOS app following VIPER architecture. But in an **easy way**.

## Viper the easy way
We all know Viper is cool. But we also know that it's hard to setup. This library intends to simplify all that boilerplate process. If you don't know yet what Viper is, check this out: [Architecting iOS Apps with VIPER (objc.io)](https://www.objc.io/issues/13-architecture/viper/)

## Installation

### Requirements

- iOS 12.0+
- Swift 5.1+
- Xcode 12.0+

### Swift Package Manager (SPM)
You can easily install this framework using SPM on Xcode. Go to `File | Swift Packages | Add Package Dependency...` in Xcode and search for "http://github.com/ferranabello/Viperit"

### CocoaPods

[CocoaPods](https://cocoapods.org/) is a dependency manager for Cocoa projects.

Specify Viperit into your project's Podfile:

```ruby
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '12.0'
use_frameworks!

pod 'Viperit'
```

### Carthage

[Carthage](https://github.com/Carthage/Carthage) is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

To integrate Viperit into your Xcode project using Carthage, specify it in your `Cartfile`:

```ogdl
github "ferranabello/Viperit"
```

Run `carthage update` to build the framework and drag the built `Viperit.framework` into your Xcode project.

## Features

### Create modules easily using Xcode templates
Viperit Xcode templates can be downloaded from the [latest release](https://github.com/ferranabello/Viperit/releases) page. Download the **Templates.zip** file.

To install them, unzip the file, open your terminal and run:

```bash
cd PATH/TO/UNZIPPED/FOLDER
mkdir -p ~/Library/Developer/Xcode/Templates/
cp -R Viperit ~/Library/Developer/Xcode/Templates/
```

![Module Creation](https://raw.githubusercontent.com/ferranabello/Viperit/master/Assets/Instructions/module_creation.gif)

You can check "Also create a Storyboard file for module" if you want the storyboard file to be automatically created for you.
Choose between "Universal" to use just one view for phones and tablets, and "Dedicated Tablet View" if you want to have a separated view for tablet devices.

### Use storyboard, xib, programmatic views or SwiftUI
Any Viperit module will assume its view is loaded from a Storyboard by default. But you can use **storyboards**, **nibs**, **code** or even **SwiftUI** views! All you need to do is to override the variable *viewType* in your modules enum:

```swift
enum MySuperCoolModules: String, ViperitModule {
    case theStoryboardThing  
    case oldSchool
    case xibModule
    case whatTheSwift

var viewType: ViperitViewType {
        switch self {
        case .theStoryboardThing: return .storyboard
        case .oldSchool: return .code
        case .xibModule: return .nib
        case .whatTheSwift: return .swiftUI
        }
    }
}
```

### Built-in router functions
This framework is very flexible, it's meant to be used in any way you want, but it has some useful built-in functionalities in the router that you could use:
```swift
    //Show your module as the root view controller of the given window
    func show(inWindow window: UIWindow?, embedInNavController: Bool, setupData: Any?, makeKeyAndVisible: Bool)

//Show your module from any given view controller
    func show(from: UIViewController, embedInNavController: Bool, setupData: Any?)

//Show your module inside another view
    func show(from containerView: UIViewController, insideView targetView: UIView, setupData: Any?)

//Present your module modally
    func present(from: UIViewController, embedInNavController: Bool, presentationStyle: UIModalPresentationStyle, transitionStyle: UIModalTransitionStyle, setupData: Any?, completion: (() -> Void)?)
```

### Easy to test
You can test your module injecting mock layers like so:
```swift
    var module = AppModules.home.build()
    view = HomeMockView()
    view.expectation = expectation(description: "Test expectation")
    module.injectMock(view: view)
    ...
```

## Usage
Now, let's create our first Viperit module called "myFirstModule"!

### 0. Create your module files
Let's use the provided Xcode template to easily create all the needed classes for the module. Just click <i class="icon-file"></i> **New file** in the document panel and choose between **Protocol-oriented module**,  **Object-oriented module** or **SwiftUI module** under the "Viperit" section.

### 1. Create a modules enum
You need at least one (you can use as many as you like, maybe to group modules by functionality) enum that implements the ViperitModule protocol to enumerate your application modules.
```swift
import Viperit

//MARK: - Application modules
enum AppModules: String, ViperitModule {
    case myFirstModule
}
```

### 2. Build the module and perform navigation
Imagine this is a new app and we want to load our "myFirstModule" module as the app's startup module
```swift
import Viperit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        window = UIWindow(frame: UIScreen.main.bounds)
        let module = AppModules.myFirstModule.build()
        let router = module.router as! MyFirstModuleRouter
        router.show(inWindow: window)
        return true
    }
}
```
This is just an example, you could of course use your own router functions instead of the provided show(inWindow:):
```swift
    window = UIWindow(frame: UIScreen.main.bounds)
    let module = AppModules.myFirstModule.build()
    let router = module.router as! MyFirstModuleRouter
    router.mySuperCoolShowFunction(inWindow: window)
```

### 2.1. Are you using SwiftUI?
Let's say you created a module based on SwiftUI called 'Cool'.
All you need to do is to use the new Viperit SwiftUI module builder:

```swift
import SwiftUI
import Viperit

//A sample function that could be implemented in some Router to show your Cool SwiftUI module
//You can even inject an @EnvironmentObject view model to your SwiftUI view.
func showTheCoolModule() {
  let module = AppModules.cool.build { presenter -> (CoolView, UserSettings) in
      let p = presenter as! CoolPresenterApi
      let settings = p.settings()
      return (CoolView(presenter: p), settings)
  }
  let router = module.router as! CoolRouter
  router.show(from: viewController)
}
```

Check the example app to have a better understanding of how it works, and how to manage data flow on SwiftUI with the presenter.

### 3. Follow the Viper flow
Everything is ready for you to make great things the Viper way!
Clone the repo and run the 'Example' target to see it in action! Or just try it with Cocoapods:
```ruby
pod try Viperit
```

## Author

[Ferran Abelló](https://www.github.com/ferranabello "Ferran Abelló Github")

## License

Viperit is released under [MIT license](https://raw.githubusercontent.com/ferranabello/viperit/master/LICENSE) and copyrighted by Ferran Abelló.

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