AutoLayoutPlus: A bit of steroids for AutoLayout, powered by Swift

AutoLayoutPlus

AutoLayoutPlus is a Swift library consisting in a set of extensions to help dealing with Auto Layout programatically. With AutoLayoutPlus you don't need to change the way you've always worked with Auto Layout, it should feel as natural complement.

Keep reading for some more details on what's included (and have a look at the example provided)!

Features

•  AutoLayoutPlus complements the existing UIKit methods to create constraints for your views.
•  Helper methods for the most repetitive tasks (center view, apply the same constraint to multiple views, fill view horizontally, etc).
•  Makes your code less verbose and easier to follow.
•  No need to learn yet another DSL or library: AutoLayoutPlus feels natural and provides a similar experience to the methods you are already familiar with!

Extensions

AutoLayoutPlus works by adding some useful extensions to NSLayoutConstraint and UIView classes. To make use of those extensions don't forget to import AutoLayoutPlus into your code:

import AutoLayoutPlus

To help reducing the verbosity of the code, the multiplier and constant arguments have default values 1 and 0, respectively, so you won't have to specify them unless absolutely necessary.

NSLayoutConstraint extensions

convenience init(item view1: AnyObject, attribute attr1: NSLayoutAttribute, relatedBy relation: NSLayoutRelation, toItem view2: AnyObject?, attribute attr2: NSLayoutAttribute)

Usage:

// Old style
NSLayoutConstraint(item: centerBlueContainer, attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY, multiplier: 1, constant: 0)

// AutoLayoutPlus style
NSLayoutConstraint(item: centerBlueContainer, attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY)

---

class func withFormat(format: String, options: NSLayoutFormatOptions = NSLayoutFormatOptions(rawValue: 0), metrics: [String : AnyObject]? = nil, views: [String : AnyObject]) -> [NSLayoutConstraint]

Usage:

// Old style
NSLayoutConstraint.constraintsWithVisualFormat("V:|[topContainer(==60)]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views)

// AutoLayoutPlus style
NSLayoutConstraint.withFormat("V:|[topContainer(==60)]", views: views)

---

class func constraints(items views: [AnyObject], attribute attr1: NSLayoutAttribute, relatedBy relation: NSLayoutRelation, toItem view: AnyObject?, attribute attr2: NSLayoutAttribute, multiplier: CGFloat = 1, constant c: CGFloat = 0) -> [NSLayoutConstraint]

Usage:

// Old style
NSLayoutConstraint(item: centerBlueContainer, attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY, multiplier: 1, constant: 0)
NSLayoutConstraint(item: centerGreenContainer, attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY, multiplier: 1, constant: 0)
NSLayoutConstraint(item: centerOrangeContainer, attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY, multiplier: 1, constant: 0)

// AutoLayoutPlus style
NSLayoutConstraint.constraints(items: [centerBlueContainer, centerGreenContainer, centerOrangeContainer], attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY)

UIView extensions

func centeredInParent(multiplierX: CGFloat = 1, constantX: CGFloat = 0, multiplierY: CGFloat = 1, constantY: CGFloat = 0) -> [NSLayoutConstraint]
func centeredInView(view: UIView, multiplierX: CGFloat = 1, constantX: CGFloat = 0, multiplierY: CGFloat = 1, constantY: CGFloat = 0) -> [NSLayoutConstraint]

Usage:

// Old style
NSLayoutConstraint(item: centerBlueContainer, attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY, multiplier: 1, constant: 0)
NSLayoutConstraint(item: centerBlueContainer, attribute: .CenterX, relatedBy: .Equal, toItem: view, attribute: .CenterX, multiplier: 1, constant: 0)
        
// AutoLayoutPlus style
centerBlueContainer. centeredInParent()

---

func centeredInParentY(multiplier: CGFloat = 1, constant: CGFloat = 0) -> NSLayoutConstraint
func centeredInParentX(multiplier: CGFloat = 1, constant: CGFloat = 0) -> NSLayoutConstraint
func centeredInViewY(view: UIView, multiplier: CGFloat = 1, constant: CGFloat = 0) -> NSLayoutConstraint
func centeredInViewX(view: UIView, multiplier: CGFloat = 1, constant: CGFloat = 0) -> NSLayoutConstraint

Usage:

// Old style
NSLayoutConstraint(item: centerBlueContainer, attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY, multiplier: 1, constant: 0)
        
// AutoLayoutPlus style
centerBlueContainer. centeredInParentY()

---

func sameDimensionsAsParent(multiplier: CGFloat = 1, constant: CGFloat = 0) -> [NSLayoutConstraint]
func sameDimensionsAsView(view: UIView, multiplier: CGFloat = 1, constant: CGFloat = 0) -> [NSLayoutConstraint]

Usage:

// Old style
NSLayoutConstraint(item: centerBlueContainer, attribute: .Height, relatedBy: .Equal, toItem: view, attribute: .Height, multiplier: 1, constant: 0)
NSLayoutConstraint(item: centerBlueContainer, attribute: .Width, relatedBy: .Equal, toItem: view, attribute: .Width, multiplier: 1, constant: 0)
        
// AutoLayoutPlus style
centerBlueContainer. sameDimensionsAsParent()

---

func sameHeightAsParent(multiplier: CGFloat = 1, constant: CGFloat = 0) -> NSLayoutConstraint
func sameWidthAsParent(multiplier: CGFloat = 1, constant: CGFloat = 0) -> NSLayoutConstraint
func sameHeightAsView(view: UIView, multiplier: CGFloat = 1, constant: CGFloat = 0) -> NSLayoutConstraint
func sameWidthAsView(view: UIView, multiplier: CGFloat = 1, constant: CGFloat = 0) -> NSLayoutConstraint

Usage:

// Old style
NSLayoutConstraint(item: centerBlueContainer, attribute: .Height, relatedBy: .Equal, toItem: view, attribute: .Height, multiplier: 1, constant: 0)
        
// AutoLayoutPlus style
centerBlueContainer. sameHeightAsParent()

---

func likeParent() -> [NSLayoutConstraint]
func likeView(view: UIView) -> [NSLayoutConstraint]

Usage:

// Old style
NSLayoutConstraint(item: centerBlueContainer, attribute: .Height, relatedBy: .Equal, toItem: view, attribute: .Height, multiplier: 1, constant: 0)
NSLayoutConstraint(item: centerBlueContainer, attribute: .Width, relatedBy: .Equal, toItem: view, attribute: .Width, multiplier: 1, constant: 0)
NSLayoutConstraint(item: centerBlueContainer, attribute: .CenterY, relatedBy: .Equal, toItem: view, attribute: .CenterY, multiplier: 1, constant: 0)
NSLayoutConstraint(item: centerBlueContainer, attribute: .CenterX, relatedBy: .Equal, toItem: view, attribute: .CenterX, multiplier: 1, constant: 0)
     
// AutoLayoutPlus style
centerBlueContainer. likeParent()

Requirements

• iOS 8.0+
• Xcode 7.0+

Instalation

CocoaPods

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

$ gem install cocoapods

To integrate AutoLayoutPlus into your Xcode project using CocoaPods, include this in your Podfile:

platform :ios, '8.0'
use_frameworks!

pod 'AutoLayoutPlus'

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 AutoLayoutPlus into your Xcode project using Carthage, specify it in your Cartfile:

github "ruipfcosta/AutoLayoutPlus" "master"

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

Author: ruipfcosta
Source Code: https://github.com/ruipfcosta/AutoLayoutPlus
License: MIT license

#ios #swift 

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