CODEWITHSUNDEEP
swiftalamofire
chris
chris

Reputation: 4996

Swift/iOS8 Sequential HTTP requests

I wrote some code a while back that logs into a website with credentials entered by the user and then navigates to a certain page to parse the information there (using NSURLConnectionDelegate).

func startConnection() {
    var url = NSURL(string:"https://www.website.com/psp/ps/?cmd=login&languageCd=ENG")
    var request = NSMutableURLRequest(URL: url!)
    request.HTTPMethod = "POST"

    let data = (dataString as NSString).dataUsingEncoding(NSUTF8StringEncoding)

    request.HTTPBody = data

    request.setValue("\(data!.length)", forHTTPHeaderField: "Content-Length")
    request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    request.setValue("text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8", forHTTPHeaderField: "Accept")

    connection1 = NSURLConnection(request: request, delegate: self, startImmediately: false)!

    connection1.start()
}

func connectionDidFinishLoading(connection: NSURLConnection) {

    if (connection == connection1) {
        let url = NSURL(string: "https://www.nexturl.com")
        var request = NSMutableURLRequest(URL: url!)
        connection2 = NSURLConnection(request: request, delegate: self, startImmediately: false)!
        connection2.start()

    }

    if (connection == connection2) {

        let url = NSURL(string: "https://www.nexturl.com")
        var request = NSMutableURLRequest(URL: url!)
        connection3 = NSURLConnection(request: request, delegate: self, startImmediately: false)!
        connection3.start()
    }

    if (connection == connection3) {
        let strData: NSString = NSString(data: responseData, encoding: NSUTF8StringEncoding)!
        parse(strData)


    }

}

The general idea is fire off an initial request and then send off other requests from the delegate method connectionDidFinishLoading. Is there a cleaner/better way to do this kind of sequential calling?

Upvotes: 0

Views: 940

Answers (1)

chris
chris

Reputation: 4996

So I did it using the Alamofire framework (new version of AFNetworking):

    var loginRequest = NSMutableURLRequest(URL: NSURL(string:"login.com")!)
    loginRequest.HTTPMethod = "POST"

    loginRequest.HTTPBody = ("timezoneOffset=-600&userid1=\(username)&userid=\(username.capitalizedString)&pwd=\(pass)&x=31&y=12" as NSString).dataUsingEncoding(NSUTF8StringEncoding)

    let manager = Alamofire.Manager.sharedInstance

    // Chain requests
    manager.request(loginRequest)
        .responseString{ (request, response, string, error) in
            if response!.statusCode == 500 {
                return Error.InternalServerError
            }
            else {

            manager.request(.GET, "www.redirect.com")
                .responseString { (request, response, string, error) in
                    println(string)
            }
        }
    }

Upvotes: 2

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