$ gem install cocoapods

go to project directory

pod init pod install

Please close any current Xcode sessions and use AppName.xcworkspace for this project from now on.

Examples of Swift 3 API Naming
array.append(contentsOf: [2,3,4])
array.insert(1, at: 0)

if url.isFileURL {}
x = url.AppendingPathComponent("file.txt")
Import as Member
extension CGContext {
  func fillPath() {

extension UserDefaults {
  class let didChangeNotification: NSNotification.Name

center.addObserver(forName: UserDefaults.didChangeNotification,...)
Collection Indexing
i = collection.startIndex
next = collection.index(after: i)