Question

我正在尝试发布http帖子请求，但是该方法在字典填充之前返回。

如何强制方法等待回调？

func makeRequest()-> [String :AnyObject]{
        var ans : [String :AnyObject] = ["response" : "", "data" : "", "error" : ""]
        var request = NSMutableURLRequest(URL: NSURL(string: self.url)!, cachePolicy: NSURLRequestCachePolicy.ReloadIgnoringLocalCacheData, timeoutInterval: 5)
        if self.jsonIcluded {
            var err: NSError?
            let req = NSJSONSerialization.dataWithJSONObject(self.data!, options: NSJSONWritingOptions.PrettyPrinted, error: &err)
            request.HTTPBody = req
        }
        request.HTTPMethod = "POST"
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")

        let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
            data, response, error in

            if error != nil
            {
                println("error=\(error)")
                return
            }
            ans["response"] = response
            ans["data"] = data
            ans["error"] = error
        }
        task.resume()
        return ans
    }

Answer 1

NSURLSession用于发出异步请求。如果要发送同步请求，请使用NSURLConnection -sendSynchronousRequest:方法。

let reply = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error:&error)
return reply

我如何强制方法等待swift上的回调完成？

1 个答案: