"connection(_：didReceive：)"的模棱两可的使用

Question

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

此代码返回错误：

"connection(_：didReceive：("的模棱两可的使用

我在 GitHub 上提到了 Apple 的官方进化线程，我尊重语法但不起作用：

引用方法的 Objective-C 选择器

Answer 1

NSURLConnectionDataDelegate是一个

协议，你不能使用NSURLConnectionDataDelegate.connection(_:didReceive:)创建选择器，你必须使用NSURLConnectionDataDelegate的实现，如下所示：

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

然后你可以创建一个这样的选择器：

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

Answer 2

不要强制转换选择器：

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

解决了，只需添加"？"：

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