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

Try with xcode7-b6:

view.autoresizingMask = UIViewAutoresizing.FlexibleWidth.union(UIViewAutoresizing.FlexibleHeight)

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]

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