TieKit

TieKit is a Swift DSL framework designed to ease the use of NSLayoutAnchor and NSLayoutconstraint in UIKit.

Anchor shortcuts

let view = UIView(frame: .zero)
_ = view.top()	            // top anchor
_ = view.top(margin: false)	// top anchor of layout margin guide
_ = view.top(margin: true)	// top anchor

Building constraints with Anchors

Equal

// tie anchors with equal relation
let constraint: TieConstraint = subview.top() --- superview.top()

// tie anchors with constant spacing, and ignoring result
subview.leading() --- superview.leading() + 20

Greater or equal

// tie anchors with 'greater than or equal' relation
let constraint: TieConstraint = subview.top() ~~> superview.top()

// tie anchors with constant spacing, and ignoring result
subview.leading() ~~> superview.leading() + 20

Less or equal

// tie anchors with 'less than or equal' relation
let constraint: TieConstraint = subview.top() <~~ superview.top()

// tie anchors with constant spacing, and ignoring result
subview.leading() <~~ superview.leading() + 20

Dimension anchors

// dimension equal to constant
let constraint: TieConstraint = subview.height() --= 80

// dimension greater or equal to constant
let constraint: TieConstraint = subview.height() ~>= 80

// dimension less or equal to constant and ignoring result
subview.height() <~= 80

Using TieSize

The TieSize enumeration set predefined sizes you can use in your code or in your storyboards.

The base value TieSize.spacing defines the base spacing. You can change it (as soon as possible in your app lifecycle, like your AppDelegate).

TieSize.spacing = 6

Usage in code

let smallSpacing: CGFloat = TieSize.s.spacing

You can use TieSize to add to a constraint directly.

subview.leading() --- superview.leading() + .s

Use in storyboard

When setting a constraint in storyboard you can use TieSize to.

• Set the class of the constraint to TieConstraint.
• In the Attributes inspector tab, set the Spacing name value as a text with the predefined values: xs, s, m, l, xl, xxl. You can even sum the values: m+s.