Binary operator '|' cannot be applied to two UIViewAutoresizing operands

The OptionSetType got an updated syntax for Swift 2.x and another update for Swift 3.x

Swift 3.x

view.autoresizingMask = [.flexibleWidth, .flexibleHeight]

Swift 2.x

view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]

This are the differences between Swift 1.2 and 2:

// swift 1.2
view.autoresizingMask = .FlexibleWidth | .FlexibleTopMargin

// swift 2
view.autoresizingMask = [.FlexibleWidth, .FlexibleTopMargin]