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UITableViewやUICollectionViewのセクションをenumで管理

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UITableViewやUICollectionViewのセクションはViewController内にenumとして定義しましょう。
セクション数の取得等に、count, arrayを定義しておくと非常に便利です。

    enum Section : Int {
        case Header
        case Bill
        case Payment
        
        static let count:Int = {
            return array.count
        }()
        
        static let array:[Section] = {
            var sections = [] as [Section]
            var i = 0
            while(true){
                if let s = Section(rawValue: i++){
                    sections.append(s)
                }
                else{
                    break
                }
            }
            return sections
        }()
    }
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