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Swift 2でビット演算子|を使うとエラーになる場合

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以下のコードはSwift 2ではエラーとなります。

example1.swift
let view = UIView()
view.autoresizingMask = .FlexibleTopMargin | .FlexibleBottomMargin

Type of expression is ambiguous without more context

これはSwift 1.2ではRawOptionSetTypeだったものがSwift 2.0でOptionSetTypeに変わったためです。
RawOptionSetTypeではビット演算が可能です。

Swift Standard Library Reference OptionSetType Protocol Reference

Swift 2では以下のように記述します。

example2.swift
let view = UIView()
view.autoresizingMask = [.FlexibleTopMargin, .FlexibleBottomMargin]
arthur87
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