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VisualizaçõesSwift: 'Hashable.hashValue' is deprecated as a protocol requirement;
I've been facing following issue (it's just a warning) with my iOS project.
'Hashable.hashValue' is deprecated as a protocol requirement; conform type 'ActiveType' to 'Hashable' by implementing 'hash(into:)' instead
- Xcode 10.2
- Swift 5
Source Code:
public enum ActiveType {
case mention
case hashtag
case url
case custom(pattern: String)
var pattern: String {
switch self {
case .mention: return RegexParser.mentionPattern
case .hashtag: return RegexParser.hashtagPattern
case .url: return RegexParser.urlPattern
case .custom(let regex): return regex
}
}
}
extension ActiveType: Hashable, Equatable {
public var hashValue: Int {
switch self {
case .mention: return -1
case .hashtag: return -2
case .url: return -3
case .custom(let regex): return regex.hashValue
}
}
}
Any better solution? The warning itself suggesting me to implement 'hash(into:)' but I don't know, how?
Reference: ActiveLabel
·
Santiago Trujillo
1 Respostas
Responde à pergunta0
As the warning says, now you should implement the hash(into:) function instead.
func hash(into hasher: inout Hasher) {
switch self {
case .mention: hasher.combine(-1)
case .hashtag: hasher.combine(-2)
case .url: hasher.combine(-3)
case .custom(let regex): hasher.combine(regex) // assuming regex is a string, that already conforms to hashable
}
}
It would be even better (in case of enums and struct) to remove the custom hash(into:) implementation (unless you need a specific implementation) as the compiler will automatically synthesize it for you.
Just make your enum conforming to it:
public enum ActiveType: Hashable {
case mention
case hashtag
case url
case custom(pattern: String)
var pattern: String {
switch self {
case .mention: return RegexParser.mentionPattern
case .hashtag: return RegexParser.hashtagPattern
case .url: return RegexParser.urlPattern
case .custom(let regex): return regex
}
}
}
·
Santiago Trujillo
Relatório
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