swift - 'connection(_:didReceive:)' 的使用不明确

Question

static let didReceiveResponseSelector : Selector = #selector((NSURLConnectionDataDelegate.connection(_:didReceive:)) as (NSURLConnectionDataDelegate) ->(NSURLConnection,URLResponse) -> ())

此代码返回错误:

Ambiguous use of 'connection(_:didReceive:)'

我在 GitHub 上引用了 Apple 的官方 evolution 线程，我尊重语法但不起作用:

Referencing the Objective-C selector of a method

Answer 1

NSURLConnectionDataDelegate 是一种协议(protocol)，您不能使用 NSURLConnectionDataDelegate.connection(_:didReceive:) 创建选择器，您必须使用 NSURLConnectionDataDelegate 的实现，例如:

class YourDelegateImplementation: NSURLConnectionDataDelegate {
     public func connection(_ connection: NSURLConnection, didReceive data: Data) {
     }
}

然后你可以像这样创建一个选择器:

let yourDelegate: YourDelegateImplementation = YourDelegateImplementation()
let yourSelector : Selector = #selector(yourDelegate.connection(_:didReceive:))