Swift AsynchronousRequest response cannot be read - ios

Question

I'm trying to connect to a database from an iOS application written in Swift. I can't find a function that replaces all the others, which have been marked as deprecated in the latest iOS update (9.2?). Some of those functions are sendSynchronousRequest and sendAsynchronousRequest.
I want to read the data and response from the database. I'm using the following code:
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: {(response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in
let res = response as! NSHTTPURLResponse
if(res.statusCode >= 200 && res.statusCode < 300) {
let jsonData:NSDictionary = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
}
})
I'm getting an error at the first line:
Invalid conversion from throwing function of type '(NSURLResponse?, NSData?, NSError?) throws -> Void' to non-throwing function type '(NSURLResponse?, NSData?, NSError?) -> Void'
However, when I comment out the line in the if-statement (let jsonData:NSDictionary = try ...) the error disappears.
I know this function is deprecated; I can't find anything else.
How can I read the response from the AsynchronousRequest without errors?

Answer 1

You are missing the do/catch block
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response, data, error) -> Void in
let res = response as! NSHTTPURLResponse
do {
if(res.statusCode >= 200 && res.statusCode < 300) {
let jsonData:NSDictionary = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
}
} catch {
}
}
But easier and better way in swift is this networking library: Alamofire
Example:
Alamofire.request(.GET, "https://httpbin.org/get", parameters: ["foo": "bar"])
.responseJSON { response in
print(response.request) // original URL request
print(response.response) // URL response
print(response.data) // server data
print(response.result) // result of response serialization
if let JSON = response.result.value {
print("JSON: \(JSON)")
}
}