CollectionViewShelfLayout

A UICollectionViewLayout subclass displays its items as rows of items similar to the App Store Feature tab without a nested UITableView/UICollectionView hack.

URLQueryItemEncoder

A Swift Encoder for encoding any Encodable value into an array of URLQueryItem.

PTPPlaceholderTextView

A simple naive implementation of UITextView subclass to support placeholder text rendering in UITextView

CenterAlignedCollectionViewFlowLayout

A UICollectionViewFlowLayout subclass that centers its cell to center.