Question

我试图重构代码并创建一个枚举类来保存表视图单元格的indexPath。

我想使代码以这种方式工作：

enum TableViewCell: IndexPath {
     case shopImageView = [0,0]
     case selectShopImageButton = [0,1] ...
}

，但是编译器说indexPath不是rawRepresentable。如何使indexPath rawRepresentable？该代码目前可以这样工作，我想对其进行改进。

enum TableViewCell {
    case shopImageView
    case selectShopImageButton
    case shopNameLocal
    case shopNameEN
    case addressLocal
    case addressEN
    case selectAddressButton
    case openingHours
    case datePickers
    case phone
    case email
    case uploadShopFormButton

    var indexPath: IndexPath {
        switch self {
        case .shopImageView: return [0,0]
        case .selectShopImageButton: return [0,1]
        case .shopNameLocal: return [0,2]
        case .shopNameEN: return [0,3]
        case .addressLocal: return [0,4]
        case .addressEN: return [0,5]
        case .selectAddressButton: return [0,6]
        case .openingHours: return [0,7]
        case .datePickers: return [0,8]
        case .phone: return [0,9]
        case .email: return [0,10]
        case .uploadShopFormButton: return [0,11]
        }
    }
}

Answer 1

使用硬编码的TableView IndexPath的另一种方法是使用具有静态属性的enum。这样做的好处是，如果您在各种IndexPath委托方法中引用TableView，并且需要更改IndexPath引用，则只需在其中更改一次即可。枚举。

 private enum TableIndex {
    // Section 0: Information
    static let information =        IndexPath(row: 0, section: 0)
    // Section 1: Preferences
    static let notifications =      IndexPath(row: 0, section: 1)
    static let units =              IndexPath(row: 1, section: 1)
    static let hapticFeedback =     IndexPath(row: 2, section: 1)
    // Section 2: Links
    static let leaveReview =        IndexPath(row: 0, section: 2)
    static let support =            IndexPath(row: 1, section: 2)
    static let privacyPolicy =      IndexPath(row: 2, section: 2)
    static let disclaimer =         IndexPath(row: 3, section: 2)
}

，然后您可以像这样引用它们：

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    switch indexPath {
    case TableIndex.information:
        // do something
    case TableIndex.notifications:
        // do something
    case TableIndex.units:
        // do something

        // etc

    default:
        break
    }
}

Answer 2

还有其他方法，但不一定更好，无论如何，您都可以将代码缩减为this。

enum TableViewCell: Int  {
case shopImageView = 0
case selectShopImageButton = 1
case shopNameLocal = 2
case shopNameEN = 3
case addressLocal
case addressEN
case selectAddressButton
case openingHours
case datePickers
case phone
case email
case uploadShopFormButton

var indexPath: IndexPath {
 return [0, self.rawValue]
}

还请记住，这还取决于您如何使用它们，例如在哪里以及如何传递参数。

其中一种方法。

extension IndexPath {
     init(using type: TableViewCell) {
        self.init(row: type.rawValue, section: 0)
    }
}

let indexPath = IndexPath(using: .shopNameEN)

如何使IndexPath rawRepresentable？

2 个答案: