由于 Swift 3 上的 Xcode 8 GM 无法符合 STPAddCardViewControllerDelegate [英] Cannot conform to STPAddCardViewControllerDelegate since Xcode 8 GM on Swift 3
问题描述
自从使用 Xcode 8 GM 将我的代码库转换为 swift 3 后，我在尝试符合 STPAddCardViewControllerDelegate (Stripe SDK) 时遇到此错误.我对这个错误感到非常惊讶，因为即使在使用 Xcode 自动存根这些方法时，我也会遇到同样的错误.类型似乎匹配，不知道发生了什么.
Since converting my codebase to swift 3 with Xcode 8 GM, I get this error when trying to conform to the STPAddCardViewControllerDelegate (Stripe SDK). I'm very surprised by this error because even when stubbing those methods automatically with Xcode I encounter the same error. Types seem to match, no idea what's going on.
extension ViewController: STPAddCardViewControllerDelegate {
func addCardViewControllerDidCancel(_ addCardViewController: STPAddCardViewController) {
}
func addCardViewController(_ addCardViewController: STPAddCardViewController, didCreateToken token: STPToken, completion: STPErrorBlock) {
}
}
产生这个错误
Type 'ViewController' does not conform to protocol 'STPAddCardViewControllerDelegate'
Protocol requires function 'addCardViewController(_:didCreateToken:completion:)' with type '(STPAddCardViewController, STPToken, STPErrorBlock) -> Void'; do you want to add a stub?
Candidate has non-matching type '(STPAddCardViewController, STPToken, (Error?) -> Void) -> ()'
这是协议的定义
public protocol STPAddCardViewControllerDelegate : NSObjectProtocol {
public func addCardViewControllerDidCancel(_ addCardViewController: STPAddCardViewController)
public func addCardViewController(_ addCardViewController: STPAddCardViewController, didCreateToken token: STPToken, completion: Stripe.STPErrorBlock)
}
我在这里遗漏了什么?
推荐答案
经过@AliSoftware 和@bdorfman 在相关Stripe SDK 问题，发现将 @escaping 属性添加到 completion 参数可以解决此问题.
After a bit of investigation from @AliSoftware and @bdorfman in the related Stripe SDK issue, it's been found that adding the @escaping attribute to the completion param fixes the issue.
好像是编译器&swift 端的存根问题，目前在此处跟踪:https://bugs.swift.org/browse/SR-2596.
It seems to be a compiler & stubbing issue on swift's end, that is currently tracked here: https://bugs.swift.org/browse/SR-2596.
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