SimpleLayout

SimpleLayout helps you to using auto layout very easily

Example

To run the example project, clone the repo, and run pod install from the Example directory first.

Difference in code

Using auto layout with pure iOS SDK

let top = NSLayoutConstraint(item: view, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1.0, constant: -10)
let trailing = NSLayoutConstraint(item: view, attribute: .trailing, relatedBy: .equal, toItem: self, attribute: .trailing, multiplier: 1.0, constant: 10)
let width = NSLayoutConstraint(item: view, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 30)
let height = NSLayoutConstraint(item: view, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 30)

view.addConstraints([width, height])
view.layoutIfNeeded()
self.addConstraints([top, trailing])
self.layoutIfNeeded()

Using auto layout with SimpleLayout

view.layout
    .top(-10)
    .trailing(10)
    .width(fixed: 30)
    .height(fixed: 30)

Using SafeAreaLayoutGuide for iPhone X (iOS 11 or higher)

view.layout
    .top(by: view._safeAreaLayoutGuide)
    .leading()
    .trailing()
    .bottom(by: view._safeAreaLayoutGuide)

To implement auto layout using the fill method

import UIKit
import SimpleLayout_Swift

class FillExampleViewController: UIViewController {

    private lazy var subview: UIView = {
        let label = UILabel()
        label.text = "subview"
        label.textColor = .white

        let subview = UIView()
        subview.backgroundColor = .red

        subview.addSubview(label)
        label.layout
            .leading()
            .top()
            .width(fixed: 0, relation: .greaterThanOrEqual)
            .height(fixed: 0, relation: .greaterThanOrEqual)
        return subview
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        edgesForExtendedLayout = .bottom

        let label = UILabel()
        label.text = "view"

        view.addSubview(label)
        view.addSubview(subview)
        label.layout
            .leading()
            .top()
            .width(fixed: 0, relation: .greaterThanOrEqual)
            .height(fixed: 0, relation: .greaterThanOrEqual)
        subview.layout.fill(leading: 30, top: 30, trailing: -30, bottom: -30)
    }
}

To implement auto layout using the property chain

import UIKit
import SimpleLayout_Swift

class ChainExampleViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        edgesForExtendedLayout = .bottom

        let subview1 = label(backgroundColor: .red, text: "subview1")
        let subview2 = label(backgroundColor: .purple, text: "subview2")
        let subview3 = label(backgroundColor: .blue, text: "subview3")

        view.addSubview(subview1)
        view.addSubview(subview2)
        view.addSubview(subview3)

        subview1.layout
            .leading()
            .top()
            .width()
            .height(fixed: 150)
        subview2.layout
            .leading(by: subview1)
            .top(by: subview1, attribute: .bottom)
            .width(fixed: view.width/2)
            .bottom()
        subview3.layout
            .leading(by: subview2, attribute: .trailing)
            .top(by: subview2)
            .trailing()
            .bottom(by: view.layout.safeAreaLayoutGuide)
    }

    private func label(backgroundColor: UIColor, text: String) -> UILabel {
        let label = UILabel()
        label.backgroundColor = backgroundColor
        label.text = text
        label.textAlignment = .center
        label.textColor = .white
        return label
    }
}

Requirements

iOS SDK 9.0 equal or higher

Installation

SimpleLayout is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "SimpleLayout-Swift"

Carthage

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with Homebrew using the following command:

$ brew update
$ brew install carthage

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

github "pisces/SimpleLayout" ~> 1.2.1

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

Author

Steve Kim, hh963103@gmail.com

License

SimpleLayout is available under the MIT license. See the LICENSE file for more info.