SnapKit/README.md

<img src="http://snapkit.io/images/banner.jpg" alt="" />

SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.

[![Build Status](https://travis-ci.org/SnapKit/SnapKit.svg)](https://travis-ci.org/SnapKit/SnapKit)
[![Platform](https://img.shields.io/cocoapods/p/SnapKit.svg?style=flat)](https://github.com/SnapKit/SnapKit)
[![Cocoapods Compatible](https://img.shields.io/cocoapods/v/SnapKit.svg)](https://cocoapods.org/pods/SnapKit)
[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)

#### ⚠️ **To use with Swift 4.x please ensure you are using >= 4.0.0** ⚠️
#### ⚠️ **To use with Swift 5.x please ensure you are using >= 5.0.0** ⚠️

## Contents

- [Requirements](#requirements)
- [Migration Guides](#migration-guides)
- [Communication](#communication)
- [Installation](#installation)
- [Usage](#usage)
- [Credits](#credits)
- [License](#license)

## Requirements

- iOS 10.0+ / Mac OS X 10.12+ / tvOS 10.0+
- Xcode 10.0+
- Swift 4.0+

## Migration Guides

- [SnapKit 3.0 Migration Guide](Documentation/SnapKit%203.0%20Migration%20Guide.md)

## Communication

- If you **need help**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/snapkit). (Tag 'snapkit')
- If you'd like to **ask a general question**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/snapkit).
- If you **found a bug**, open an issue.
- If you **have a feature request**, open an issue.
- If you **want to contribute**, submit a pull request.


## Installation

### CocoaPods

[CocoaPods](http://cocoapods.org) is a dependency manager for Cocoa projects. You can install it with the following command:

```bash
$ gem install cocoapods
```

> CocoaPods 1.1.0+ is required to build SnapKit 4.0.0+.

To integrate SnapKit into your Xcode project using CocoaPods, specify it in your `Podfile`:

```ruby
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '10.0'
use_frameworks!

target '<Your Target Name>' do
    pod 'SnapKit', '~> 5.0.0'
end
```

Then, run the following command:

```bash
$ pod install
```

### Carthage

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

You can install Carthage with [Homebrew](http://brew.sh/) using the following command:

```bash
$ brew update
$ brew install carthage
```

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

```ogdl
github "SnapKit/SnapKit" ~> 5.0.0
```

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

### Swift Package Manager

[Swift Package Manager](https://swift.org/package-manager/) is a tool for managing the distribution of Swift code. It’s integrated with the Swift build system to automate the process of downloading, compiling, and linking dependencies.

> Xcode 11+ is required to build SnapKit using Swift Package Manager.

To integrate SnapKit into your Xcode project using Swift Package Manager, add it to the dependencies value of your `Package.swift`:

```swift
dependencies: [
    .package(url: "https://github.com/SnapKit/SnapKit.git", .upToNextMajor(from: "5.0.1"))
]
```

### Manually

If you prefer not to use either of the aforementioned dependency managers, you can integrate SnapKit into your project manually.

---

## Usage

### Quick Start

```swift
import SnapKit

class MyViewController: UIViewController {

    lazy var box = UIView()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.addSubview(box)
        box.backgroundColor = .green
        box.snp.makeConstraints { (make) -> Void in
           make.width.height.equalTo(50)
           make.center.equalTo(self.view)
        }
    }

}
```

### Playground
You can try SnapKit in Playground.

**Note:**

> To try SnapKit in playground, open `SnapKit.xcworkspace` and build SnapKit.framework for any simulator first.

### Resources

- [Documentation](http://snapkit.io/docs/)
- [F.A.Q.](http://snapkit.io/faq/)

## Credits

- Robert Payne ([@robertjpayne](https://twitter.com/robertjpayne))
- Many other contributors

## License

SnapKit is released under the MIT license. See LICENSE for details.