Cellなどの高さ計算の処理をViewのstructで行う ref: http://qiita.com/morizotter/items/205edf75d6da0a7f9c11

file0.swift

final class UserCell: UITableViewCell {
    struct Layout {
        static func height(vm: UserViewModel) -> CGFloat {
            return 68.0
        }
    }

    ...
}

file1.swift

let vm = ...
return UserCell.Layout.height(vm)

file2.swift

final class ItemCell: UITableViewCell {
    struct Layout {
        static let LeftAreaMargin: CGFloat = 67.0
        static let RightAreaMargin: CGFloat = 14.0
        static let TopAreaHeight: CGFloat = 41.0

        static let NameFont = UIFont.boldSystemFontOfSize(12)

        static let TitleTopHeight: CGFloat = 8.0
        static var TitleMaximumSize = CGSize(width: UIScreen.mainScreen().bounds.width - Layout.LeftAreaMargin - Layout.RightAreaMargin, height: CGFloat.max)
        static let TitleFont = UIFont.boldSystemFontOfSize(16.0)
        static let TitleAttributes = [NSFontAttributeName: Layout.TitleFont]

        static let BottomHeight: CGFloat = 18.0

        static func height(vm: ItemViewModel) -> CGFloat {
            return height(NSAttributedString(string: vm.title.value, attributes: Layout.TitleAttributes))
        }

        static func height(attributedTitle: NSAttributedString) -> CGFloat {
            var height: CGFloat = 0.0
            height += Layout.TopAreaHeight
            height += Layout.TitleTopHeight
            height += Layout.TitleHeight(attributedTitle)
            height += Layout.BottomHeight
            return ceil(height)
        }

        static func TitleHeight(attributedTitle: NSAttributedString) -> CGFloat {
            let options : NSStringDrawingOptions = .UsesLineFragmentOrigin | .UsesFontLeading
            let rect: CGRect = attributedTitle.boundingRectWithSize(Layout.TitleMaximumSize, options: options, context: nil)
            return ceil(rect.size.height)
        }
    }

    ...
}

file3.swift

let vm = ...
return ItemCell.Layout.height(vm)