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swift 2 : Error handling: throw: How to pass an object with an error?

转载 作者:行者123 更新时间:2023-11-28 07:03:03 26 4
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Swift2抛错时如何传递userInfo引用对象?

像这样的东西会很好:

guard let refIDString = memberXMLElement.attributes["ref"] else {
throw OSMVectorMapDescriptionError.ElementDoesntContainRequiredAttributes(userInfo:memberXMLElement)
}

然后:

catch OSMVectorMapDescriptionError.ElementDoesntContainRequiredAttributes {
(userInfo:AnyObject) in
//do stuff
}

但是错误是枚举,我们确实可以像这里那样指定,但是如何捕捉呢?

public enum OSMVectorMapDescriptionError:ErrorType {
case ElementDoesntContainRequiredAttributes(userInfo:AnyObject)
}

最佳答案

假设你不需要someLevel,你可以定义

public enum OSMVectorMapDescriptionError:ErrorType {
case ElementDoesntContainRequiredAttributes(userInfo: ...)
}

保持警惕

guard let refIDString = memberXMLElement.attributes["ref"] else {
throw OSMVectorMapDescriptionError.
ElementDoesntContainRequiredAttributes(userInfo:memberXMLElement)
}

catch OSMVectorMapDescriptionError.
ElementDoesntContainRequiredAttributes(let userInfo) {
//do stuff using userInfo
}

关于 swift 2 : Error handling: throw: How to pass an object with an error?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31559364/

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