extension UITableView { func registerCell<T: UITableViewCell>(type: T.Type) { let className = type.className let nib = UINib(nibName: className, bundle: nil) registerNib(nib, forCellReuseIdentifier: className) } func registerCells<T: UITableViewCell>(types: [T.Type]) { types.for</t:></t:>…

インデックスの範囲外にアクセスした場合に例外を起こさずにnilを返すExtension extension CollectionType { subscript (safe index: Index) -> Generator.Element? { return indices.contains(index) ? self[index] : nil } } let numbers = [1,2,3,4] numb…