CODEWITHSUNDEEP
swiftnsurlsession
Saber
Saber

Reputation: 49

NSURLSession dataTaskWithRequest time

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
                data, response, error in
                var taskString = NSString(data: data, encoding: NSUTF8StringEncoding)
                println(taskString)
                if taskString == "10004" {

                    self.loginStatus=10004
                }else if taskString == "10005" {

                    self.loginStatus=10005
                }else if taskString == "10002" {

                    self.loginStatus=10002
                }else if taskString == "10003" {

                    self.loginStatus=10003
                }else if taskString == "10001" {

                    self.loginStatus=10001
                }else{

                    self.loginStatus=10000
                }
            }
            task.resume()

            println(self.loginStatus)

I need to get a state through a network request I wrote the above code

task.resume()

println(self.loginStatus)

I saw it first println？ println After that change 'loginStatus' content？

Upvotes: 1

Views: 3892

Answers (1)

rakeshbs
rakeshbs

Reputation: 24572

NSURLSession.sharedSession().dataTaskWithRequest is an asynchronous process that runs in a background thread. The block inside the function is called after the asynchronous process finishes downloading the data.

The execution continues after task.resume() statement to println while the dataTaskWithRequest executes in the background. This is why your println statement is executed first. To print the value after the execution of the task, put it inside the block.

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
    data, response, error in
    var taskString = NSString(data: data, encoding: NSUTF8StringEncoding)
    println(taskString)
    if taskString == "10004" {
        self.loginStatus=10004
    } else if taskString == "10005" {
        self.loginStatus=10005
    } else if taskString == "10002" {
        self.loginStatus=10002
    } else if taskString == "10003" {
        self.loginStatus=10003
    } else if taskString == "10001" {
        self.loginStatus=10001
    } else {
        self.loginStatus=10000
    }

    println(self.loginStatus) // print it here
}
task.resume()

if loginStatus is always an Integer, you can use toInt function instead of the if statements.

Thus your code is simplified to

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
    data, response, error in
    var taskString = NSString(data: data, encoding: NSUTF8StringEncoding)
    println(taskString)

    if let status = taskString.toInt() {
       self.loginStatus = status
    }
    else {
        self.loginStatus = 10000
    }

    println(self.loginStatus) // print it here
}
task.resume()

Upvotes: 3

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