Joseph

Joseph is a lightweight auto-layout constraints description framework for Swift.

Every constraint can be expressed by a single code line, with the use of custom operator.

Notice

Simply add Joseph.swift file into your project to start using it.

This project is compatible with Xcode 8.x and iOS 8+.

Examples

Set view2 frame with margins inset and extra 20pt margin on top and bottom:

view2.edges = view1.margins + UIOffset(horizontal: 0, vertical: 20)

Set view2 under view1 with 10pt, and a priority of 751:

view2.top = view1.bottom + 10 ~ 751

Align view2 left on view1 left-margin, multiply by 1.5:

view2.left = view1.leftMargin * 1.5

Set view2 width between 220pt and 280pt:

view2.width.in(220...280)

// Same that:
220 <= view1.width; view1.width <= 280

Set view2 twice taller with priority of 251:

view2.height = view1.height × 2 ~ 251

Set view3 centred with view2:

view3.middle = view2.middle

Set view3 wider or same width:

view3.width >= view2.width

Set view2 taller or same height:

view3.height <= view2.height

Set view3 2/3 ratio (3 * width = 2 * height):

view3.ratio = 2∶3

Set hugging resistance for x-axis to 249:

view3.x <~> 249

Set shrink resistance for y-axis to 751:

view3.y >~< 751

About

The code source is in public domain.

Lisacintosh, 2017