ios sharedsession在完成时出错

在学习iOS sharedSession单例调用和异步调用时，我被这个讨厌的错误阻止了

这是我的密码

let baseUrl = NSURL(string: "https://api.forecast.io/forecast/\(apiKey)/")
let forecast = NSURL(string: "47.856223,-122.272590", relativeToURL: baseUrl)
let sharedSession = NSURLSession.sharedSession()
let downloadTask: NSURLSessionDownloadTask =
sharedSession.downloadTaskWithURL( forecast, completionHandler:
    { (loction: <#NSURL!#>, response: <#NSURLResponse!#>, error: <#NSError!#>) -> Void in
        println(response);
    })

}

---

您需要添加带有适当变量的占位符

sharedSession.downloadTaskWithURL(forecast , completionHandler:{(location:NSURL!, response:NSURLResponse!, error:NSError!) -> Void in
    println(response);

 })

---

那是你真正的密码吗？必须用实际类型替换占位符。

1-expected an identifier to name generic parameter
2- expect parameter type following :

sharedSession.downloadTaskWithURL(forecast , completionHandler:{(location:NSURL!, response:NSURLResponse!, error:NSError!) -> Void in
    println(response);

 })