Constraint Proxy

Auto Layout convenience with minimal API surface area, but high expressive power

Features

• Minimal API accessible through constraint proxy
• Direct access to created NSLayoutConstraint
• UILayoutGuide support
• New UILayoutPriority constants including .maxNonRequired (999) for resolving layout ambiguities
• translatesAutoresizingMaskIntoConstraints is automatically set to false on a target

Usage

Edges

subview.constraint.edges(to: view)

subview.constraint.edges(to: view, insets: .uniform(10))

subview.constraint.edges(excluding: .bottom, to: view, insets: .horizontal(10))

subview.constraint.edges(.bottom, .leading, to: view, insets: .leading(10))

Horizontal axis

subview.constraint.trailing(to: view)

subview.constraint.centerX(to: view)

subview.constraint.leading(to: view, .centerX)

subview.constraint.trailing(to: view, .leading, constant: 10)

Vertical axis

subview.constraint.bottom(to: view)

subview.constraint.centerY(to: view)

subview.constraint.top(to: view, .centerY)

subview.constraint.bottom(to: view, .top, constant: 10)

subview.constraint.lastBaseline(to: view)

Center

subview.constraint.center(to: view)

Size

subview.constraint.size(CGSize(width: 75, height: 75))

subview.constraint.size(to: view)

subview.constraint.size(to: view, multiplier: 0.5)

Dimension

subview.constraint.width(to: view)

subview.constraint.height(to: view, .width)

subview.constraint.height(to: view, multiplier: 0.5)

subview.constraint.width(constant: 50)

subview.constraint.height(constant: 75)

Layout guide

UIView and UILayoutGuide can be used interchangeably.

subview.constraint.edges(to: view.layoutMarginsGuide)

subview.constraint.lastBaseline(to: view.safeAreaLayoutGuide, .bottom)

subview.constraint.width(to: view.readableContentGuide)

Relation

Allmost all constraint methods have relation parameter.

subview.constraint.leading(to: view, relation: .greaterThanOrEqual)

Priority

All constraint methods have priority parameter.

subview.constraint.leading(to: view, priority: .defaultLow)

Activation

Constraints are created active by default. All constraint methods have active parameter to opt out of this.

subview.constraint.leading(to: view, active: false)

Installation

Requirements

• iOS 11.0+
• Swift 5.0+

Carthage

github "vadimtrifonov/ConstraintProxy"