by David Lashkhi
Working with UIPopoverPresentationController
by PeteBarber
Optional Chaining with Dictionaries (in Swift)
by Will J Miller
This article describes the implementation of a custom class called MMSCropImageView. The class gives the feature of drawing and moving a rectangle over an image to identify the crop region and return it in an UIImage. It explains the considerations and solutions for cropping a bitmap.
by Will J Miller
Describes a design approach for implementing dynamic rows in a UITableView