不明確使用「連接（_：didReceive :)」的

Question

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

此代碼返回錯誤：

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

我提到GitHub上蘋果的官方發展線程，我很尊敬的語法，但不工作：

Referencing the Objective-C selector of a method

Answer 1

解決，只需加上 「？」：

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

Answer 2

NSURLConnectionDataDelegate是一個協議，你不能創建使用NSURLConnectionDataDelegate.connection(_:didReceive:)一個選擇，你必須使用NSURLConnectionDataD的實現elegate像：

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

然後你就可以創建這樣一個選擇：

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

Answer 3

不要投的選擇：

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

另外值得一提的是，委託功能connection(_ connection: NSURLConnection, didReceive challenge: URLAuthenticationChallenge)已棄用connection(_ connection: NSURLConnection, willSendRequestFor challenge: URLAuthenticationChallenge)。