自Swift 3上的Xcode 8 GM起，无法符合STPAddCardViewControllerDelegate [英] Cannot conform to STPAddCardViewControllerDelegate since Xcode 8 GM on Swift 3
问题描述
由于使用Xcode 8 GM将我的代码库转换为swift 3，因此在尝试符合 STPAddCardViewControllerDelegate （Stripe SDK）时出现此错误。我对此错误感到非常惊讶，因为即使使用Xcode自动存取这些方法，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) {
}
}
产生此错误
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) -> ()'
以下是协议的定义
public protocol STPAddCardViewControllerDelegate : NSObjectProtocol {
public func addCardViewControllerDidCancel(_ addCardViewController: STPAddCardViewController)
public func addCardViewController(_ addCardViewController: STPAddCardViewController, didCreateToken token: STPToken, completion: Stripe.STPErrorBlock)
}
我在这里缺少什么？
推荐答案
经过@AliSoftware和@bdorfman的相关调查 Stripe SDK问题，已经发现将 @escaping 属性添加到完成 param解决了这个问题。
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.
它似乎是一个编译器& swift结尾的存根问题，目前正在跟踪： 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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