Question about async

[ldong]

I'm trying to do a login and get the cookies from server.

func foo(username: String, password: String) -> Bool {
        var url = "http://example"
        var request = HTTPTask()
        var parameters = ["username": username, "password": password]
        var result = false;
        request.requestSerializer = JSONRequestSerializer()
        request.POST(url, parameters: parameters,
        success: {
            (response: HTTPResponse) in
            if response.responseObject != nil {
                result = true
            },
        }, failure: {(error: NSError) in
                println(" error \(error)")
        })
    return result;
}

Since its running async, my result always is false. Any suggestion of fixing it? Thanks.

[daltoniam]

This isn't an issue with SwiftHTTP directly, but rather an issue with understanding async code design. I would recommend checking out these links:

https://developer.apple.com/library/mac/documentation/Performance/Reference/GCD_libdispatch_Ref/index.html

https://developer.apple.com/library/mac/documentation/Swift/Conceptual/Swift_Programming_Language/Closures.html

They both explain how GCD works as well as how closures work, both which should help in understanding how to structure async code.

Also just off hand:

func foo(username: String, password: String, finished:((Bool) -> Void)) -> Void {
        var url = "http://example"
        var request = HTTPTask()
        var parameters = ["username": username, "password": password]
        request.requestSerializer = JSONRequestSerializer()
        request.POST(url, parameters: parameters,
        success: {
            (response: HTTPResponse) in
            if response.responseObject != nil {
                finished(true)
            },
        }, failure: {(error: NSError) in
                println(" error \(error)")
                finished(false)
        })
}

Then calling foo would look like:

foo("test", password: "test", finished: {(result: Bool) -> Void in
   println("result is: \(result)")
  //do more stuff now that I know the result
})

[ldong]

Thanks @daltoniam
I just want to point out the correct syntax for calling the function should be the following.

var result: Bool = false
foo(username.text, password: password.text, finished: {(result:Bool) -> Void in
        println("result is: \(result)")
})

[daltoniam]

ah good catch, I change it to be proper. Thanks.