使用 (Int, Int) 元组案例在 Swift switch 语句中获取 "Binary operator ~= cannot be applied to two (Int, Int) operands"

Question

我有一个 UITableViewController 和一个称为 IndexPath 的私有 enum 作为嵌套类型。

class SettingsViewController: UITableViewController {

    enum IndexPath {
        case Gender, Weight, EmergencyContact

        var tuple: (Int, Int) {
            switch self {
            case .Gender:
                return (0, 0)

            case .Weight:
                return (0, 1)

            case .EmergencyContact:
                return (1, 0)
            }
        }
    }

}

这样做的目的是，在我的 cellForRowAtIndexPath 中，我可以简单地将节和行放在一个元组中，并制作一个 switch 语句来匹配枚举值。这样，我就可以为该索引路径自定义单元格：

switch (indexPath.section, indexPath.row) {
case IndexPath.Gender.tuple:
    // Do something.

case IndexPath.Weight.tuple:
    // Do something.

case IndexPath.EmergencyContact.tuple:
    // Do something.

default:
    break;

}

但是，我一直在 switch case 所在的行上收到编译器错误 Binary operator ~= cannot be applied to two (Int, Int) operands。知道那是什么意思吗？我什至不知道运算符 ~=，我也没有明确使用它。

Answer 1

这样做。

  switch (indexPath.section, indexPath.row) {
    case (IndexPath.Gender.tuple.0, IndexPath.Gender.tuple.1):
         // Do something.

    case (IndexPath.Weight.tuple.0, IndexPath.Weight.tuple.1):
        // Do something.

    case (IndexPath.EmergencyContact.tuple.0, IndexPath.EmergencyContact.tuple.1):
        // Do something.

    default:
        break;

    }

使用 (Int, Int) 元组案例在 Swift switch 语句中获取 "Binary operator ~= cannot be applied to two (Int, Int) operands"

Getting "Binary operator ~= cannot be applied to two (Int, Int) operands" in Swift switch statement with (Int, Int) tuple cases

cocoa-touch

foundation

ios

swift