Swift Alamofire quit when request timed out - ios

Question

I wonder how I can exit out of my function when request timed out.
If I put my server offline and try to do some calls with this function the app will crash due to:
fatal error: unexpectedly found nil while unwrapping an Optional value
My Alamofire v3.x function looks like this:
static func loginWithFb(facebookId: String, email: String, username: String, response: (token: String?, errorVal: JSON?) -> ()) {
let urlString = baseURL + ResourcePath.FbLogin.description
let parameters: [String: AnyObject] = [
"facebook_id": facebookId,
"user_type": 1,
"email": email,
"username": username
]
Alamofire.request(.POST, urlString, parameters: parameters).responseJSON{ (responseData) -> Void in
let json = JSON(responseData.result.value!)
let token = json["api_key"].string
response(token: token, errorVal: json)
}
}
I get nil from:
let json = JSON(responseData.result.value!)
and the error:
FAILURE: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo={NSUnderlyingError=0x7fc39349c4a0 {Error Domain=kCFErrorDomainCFNetwork Code=-1001 "(null)" UserInfo={_kCFStreamErrorCodeKey=-2102, _kCFStreamErrorDomainKey=4}}, NSErrorFailingURLStringKey=http://mysite.dev/fb, NSErrorFailingURLKey=http://mysite.dev/fb,
_kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-2102, NSLocalizedDescription=The request timed out.}
fatal error: unexpectedly found nil while unwrapping an Optional value
So how can I exit the call if the request timed out? preventing it from trying to get the json data
Thanks,

Answer 1

You can increase the timeout interval if your service getting long time.
let request = NSMutableURLRequest(URL: NSURL.init(string: "your url")!)
request.HTTPMethod = "GET"
request.timeoutInterval = 250 // Set your timeout interval here.
Alamofire.request(request).responseJSON { (responseData) -> Void in
if((responseData.result.value) != nil) { //Check for response
print(responseData.result.value!)
}
}
And must check that the response is not nil to resolve the issue of fatal error.

Answer 2

you need to know more about swift variable unwrapping, just a simple if(myJsonData != nil) would prevent the app crash, you can also add an alert box in case that there is no data on server or the server is down etc...
static func loginWithFb(facebookId: String, email: String, username: String, response: (token: String?, errorVal: JSON?) -> ()) {
let urlString = baseURL + ResourcePath.FbLogin.description
let parameters: [String: AnyObject] = [
"facebook_id": facebookId,
"user_type": 1,
"email": email,
"username": username
]
Alamofire.request(.POST, urlString, parameters: parameters).responseJSON{ (responseData) -> Void in
let myJsonData = JSON(responseData.result.value!)
if(myJsonData != nil)
{
let token = myJsonData["api_key"].string
}
else
{
// show alert box
}
}
}

Answer 3

Your issue is here
let json = JSON(responseData.result.value!)
you are force unwrapping value! instead you should wrap it in an if let
if let json = JSON(responseData.result.value) as? NSDictionary {
let token = json["api_key"].string
response(token: token, errorVal: json)
}
The timeout is fine and is not effecting your app in any way.