1. Requirements

• iOS 9.0+
• Xcode 10.0+
• Swift 4.2+

2. Installation

1.CocoaPods

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ gem install cocoapods

CocoaPods 1.1.0+ is required to build DCAutoLayout 1.0.0+.

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

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

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

Then, run the following command:

$ pod install

2.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 DCAutoLayout into your Xcode project using Carthage, specify it in your Cartfile:

github "DarielChen/DCAutoLayout"

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

3.Manually

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

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3.Usage

1.Quick Start

import DCAutoLayout

class ViewController: UIViewController {
    
    lazy var label = UILabel()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        label.backgroundColor = UIColor.groupTableViewBackground
        view.addSubview(label)
        
        label.layout {
            $0.topAnchor == view.safeAreaTopAnchor + 20
            $0.leadingAnchor == view.leadingAnchor + 20
            $0.trailingAnchor == view.trailingAnchor - 20
            $0.heightAnchor == 44
        }
    }
}

2.Set superview’s edges with 20pts of padding.

label.layout {
    $0.topAnchor == view.topAnchor + 20
    $0.leadingAnchor == view.leadingAnchor + 20
    $0.trailingAnchor == view.trailingAnchor - 20
    $0.bottomAnchor == view.bottomAnchor - 20
}

Or even shorter:

label.layout {
    $0 == view.marign(20, 20, 20, 20)            
}

3.>=、<= represent greaterThanOrEqual、lessThanOrEqual.

You can use >= or <= to change Anchor.

label.layout {
    $0.centerAnchor == view.centerAnchor
    $0.widthAnchor == view.bounds.width - 40
    $0.heightAnchor >= 44
}

set height to 88pts.

label.layout {
    $0.heightAnchor == 88
}

4.Composition

marign

label.layout {
    $0 == view.marign(20, 20, 20, 20)            
}

size

label.layout {
    $0.sizeAnchor == view.size(100, 44)
}

center

label.layout {
    $0.centerAnchor == view.centerAnchor
}

5.updateConstraints

Use >=、<= to updateConstraints.

label.layout {
    $0.heightAnchor >= 44
}

Update constraint.

label.layout {
    $0.heightAnchor == 88
}

reset anchor

Set heightAnchor after remove heightAnchor.

label.layout {
    $0.removeAnchor($0.heightAnchor)
    $0.heightAnchor == 88
}

clear all anchor

Set any anchor after remove all anchor.

label.removeAllAnchor()
        
label.layout {
    $0.removeAnchor($0.heightAnchor)
    $0.heightAnchor == 88
}

4.License

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