如何修复错误:二进制运算符'=='不能应用于类型为 'NSExpression.ExpressionType' 和 '_' 的操作数



我将从HomeKit目录中浏览旧代码:创建房屋,配对和控制附件,并在我遇到一个表达式时设置触发器,说

.KeyPathExpressionType

我不能说什么

.

.KeyPathExpressionType

指的是

的左侧
.

当我搜索Google和stack 溢出的" keypathExpressionType"时,我什么都没有找到。

是一样的
.ConstantValueExpressionType

我什么也没找到。

每个平等比较

comparison.leftExpression.expressionType == .KeyPathExpressionType

comparison.rightExpression.expressionType == .ConstantValueExpressionType

在下面的代码中,生成一个错误消息,该消息说:

二进制运算符'=='不能应用于'nsexpression.expressionType'和'_''

的操作数
extension NSPredicate {
    /**
        Parses the predicate and attempts to generate a characteristic-value `HomeKitConditionType`.
        - returns:  An optional characteristic-value tuple.
    */
    private func characteristic() -> HomeKitConditionType? {
        guard let predicate = self as? NSCompoundPredicate else { return nil }
        guard let subpredicates = predicate.subpredicates as? [NSPredicate] else { return nil }
        guard subpredicates.count == 2 else { return nil }
        var characteristicPredicate: NSComparisonPredicate? = nil
        var valuePredicate: NSComparisonPredicate? = nil
        for subpredicate in subpredicates {
            if let comparison = subpredicate as? NSComparisonPredicate, comparison.leftExpression.expressionType == .KeyPathExpressionType && comparison.rightExpression.expressionType == .ConstantValueExpressionType {
                switch comparison.leftExpression.keyPath {
                    case HMCharacteristicKeyPath:
                        characteristicPredicate = comparison
                    case HMCharacteristicValueKeyPath:
                        valuePredicate = comparison
                    default:
                        break
                }
            }
        }
        if let characteristic = characteristicPredicate?.rightExpression.constantValue as? HMCharacteristic,
            characteristicValue = valuePredicate?.rightExpression.constantValue as? NSCopying {
                return .Characteristic(characteristic, characteristicValue)
        }
        return nil
    }

我替换时会出现错误

comparison.leftExpression.expressionType == .KeyPathExpressionType

comparison.leftExpression.expressionType.rawValue == NSExpression.ExpressionType.keyPath.rawValue

comparison.rightExpression.expressionType == .ConstantValueExpressionType

comparison.rightExpression.expressionType.rawValue == NSExpression.ExpressionType.constantValue.rawValue

这是正确的吗?谁能告诉我启发我这个问题?

代码已过时2代码。

.keyPath替换.KeyPathExpressionType,用.constantValue

替换.ConstantValueExpressionType

类型是NSExpression.ExpressionType,请阅读文档

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