ModernAppKit
An assortment of enhancements to AppKit to support modern app development. Addresses deficiencies in Auto Layout support, layer-backed views, and shadows.
Requires at least Swift 4.1. Tested on macOS 10.13. MIT license.
AutoLayoutTextView
An NSTextView subclass that implements intrinsicContentSize so that the text view can participate in layout outside of a scroll view.
Label
An AutoLayoutTextView subclass that acts like a label. Specifically, it is non-editable, does not draw a background by default, allows vibrancy, etc.
LayerView
A layer-backed view with additional APIs for setting background color, border width, border color, and corner radius. Use if you do not need to do custom drawing. Supports animations.
ShadowView
A container view that draws a rectangular shadow underneath its content view in a performant manner.