ios - 共享 session 的应用程序错误

Question

我已尽我所能尝试从教程中转换一些代码，但目前它似乎不起作用

Invalid conversion from throwing function

在 let task 行。

func request(url:String, callback:(NSDictionary) -> ()) {
  do{

    var nsURL = NSURL(string: url)

    let task = try NSURLSession.sharedSession().dataTaskWithURL(nsURL!){
        (data, response, error) in
        var error:NSError?

        var response = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers) as NSDictionary
        callback(response)

    }
   task.resume()
  }
  catch{
       print(error)
  }
}

Answer 1

从 NSURLSession.sharedSession 中移除 try。

func request(url:String, callback:(NSDictionary) -> ()) {

    let url = NSURL(string: url)!
    let session = NSURLSession.sharedSession()

    let task = session.dataTaskWithURL(url) { data, response, error in
        var error:NSError?
        do {
            var response = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
            callback(response)
        }catch {
            print(error)
        }
    }
}