模糊地使用'connection（_：didReceive :)'

Question

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

此代码返回错误：

  

模糊地使用'connection（_：didReceive :)'

我在GitHub上提到了Apple的官方发展主题，我尊重语法但是没有用：

Referencing the Objective-C selector of a method

Answer 1

NSURLConnectionDataDelegate是一个协议，您无法使用NSURLConnectionDataDelegate.connection(_:didReceive:)创建选择器，您必须使用NSURLConnectionDataDelegate的实现，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:))

Answer 2

不要施放选择器：

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，而不是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)?)