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)
}
和
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/