SketchKit is a lightweight, powerful and pure-Swift auto layout library, you can set up your constraints with a simple and intuitive code without any stringly typing.

In short, it allows you to replace this:

newView.translatesAutoresizingMaskIntoConstraints = false

addConstraint(NSLayoutConstraint(
              item: newView,
              attribute: NSLayoutConstraint.Attribute.centerX,
              relatedBy: NSLayoutConstraint.Relation.equal,
              toItem: view,
              attribute: NSLayoutConstraint.Attribute.centerX,
              multiplier: 1,
              constant: 0))

or

newView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true

with this

// It's NOT necessary: newView.translatesAutoresizingMaskIntoConstraints = false
newView.layout.applyConstraint { view in
    view.centerXAnchor(equalTo: self.view.centerXAnchor)
    view.centerYAnchor(equalTo: self.view.centerYAnchor)
}

Keyboard Layout Guide

The KeyboardLayoutGuide allows you to align your views relative to the keyboard in a native way, without observing notifications or calculating keyboard heights manually.

Basic usage

override func viewDidLoad() {
    super.viewDidLoad()

    // Pin your button to the keyboard
    button.layout.applyConstraint { button in
        button.bottomAnchor(equalTo: view.keyboardLayoutGuide.topAnchor)
    }
}

In the example above, the button will always be anchored to the top of the keyboard, automatically adjusting when the keyboard appears or disappears.

Safe Area behavior

By default, the KeyboardLayoutGuide aligns your view with the bottom safe area when available (iOS 11.0, tvOS 11.0, macOS 11.0 and later). On earlier versions, it falls back to the view’s bottomAnchor.

Requirements

• iOS 9.0+ / tvOS 9.0+ / macOS 10.11+
• Swift 3.2+

Installation

CocoaPods

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

target '<Your Target Name>' do
  pod 'SketchKit'
end

Then, run the following command:

$ pod install

Swift Package Manager (SPM)

To add SketchKit as a dependency, you have to add it to the dependencies of your Package.swift file and refer to that dependency in your target.

import PackageDescription
let package = Package(
    name: "<Your Product Name>",
    dependencies: [
       .package(url: "https://github.com/dogo/SketchKit", .upToNextMajor(from: "1.0.0"))
    ],
    targets: [
        .target(
            name: "<Your Target Name>",
            dependencies: ["SketchKit"]),
    ]
)

After adding the dependency, you can fetch the library with:

$ swift package resolve

Carthage

github "dogo/SketchKit"

Usage

Quick Start

import SketchKit

final class MyViewController: UIViewController {

    let myView: UIView = {
        let view = UIView(frame: .zero)
        view.color = .red
        return view
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.addSubview(myView)

        myView.layout.applyConstraint { view in
            view.topAnchor(equalTo: self.view.topAnchor)
            view.leadingAnchor(equalTo: self.view.leadingAnchor)
            view.bottomAnchor(equalTo: self.view.bottomAnchor)
            view.trailingAnchor(equalTo: self.view.trailingAnchor)
        }
    }
}

Documentation

The project documentation can be found (here)

Credits

• Nicholas Babo (@NickBabo) thank you for the SketchKit logo,

License

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