the basics of a Tinder-like swipeable cards interface based off of http://guti.in/articles/creating-tinder-like-animations/
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Cluster's reusable pre-permissions utility that lets developers ask the users on their own dialog for photos or contacts access, before making the system-based request. This is based on the Medium post by Cluster describing the different ways to ask for iOS permissions (https://medium.com/p/96fa4eb54f2c).
Extended UIView for Interface Builder by using IB_DESIGNABLE and IBInspectable.
UITextField and NSFormatter subclasses for formatting phone numbers. Allow different formats for different countries(patterns).
Formatter for numerical fields and UITextField category to use it easily while editing.