'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 上参考了 Apple 的官方进化线程，我尊重语法但不起作用：

Referencing the Objective-C selector of a method

Answer 1

NSURLConnectionDataDelegate 是一个协议，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) {
     }
}

然后您可以像这样创建一个选择器：

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

Answer 2

不要投射选择器：

let didReceiveResponseSelector = #selector(NSURLConnectionDelegate.connection(_:didReceive:))

还值得注意的是，委托函数 connection(_ connection: NSURLConnection, didReceive challenge: URLAuthenticationChallenge) 已被弃用，取而代之的是 connection(_ connection: NSURLConnection, willSendRequestFor challenge: URLAuthenticationChallenge)。

Answer 3

已解决，只需添加“？”：

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

'connection(_:didReceive:)' 的使用不明确

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

nsurlconnectiondelegate

swift

swift3

xcode8