Swift HTML Parser - html

Question

I am having trouble posting the outputs to a label. I have to covert it to a String? The error it seems to give me is "Cannot subscript a value of type JiNode? with an index of type 'Int'" Please help!
var meter = ""
#IBAction func calculate(sender: AnyObject) {
print("start scraping...")
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
let url = NSURL(string: "http://uberestimate.com/costs.php")
let jiDoc = Ji(htmlURL: url!)
if jiDoc != nil {
print("html retrived.\n")
self.scrapeHTML(jiDoc!)
}
}
}
#IBOutlet weak var resultLabel: UILabel!
#IBOutlet weak var endingPoint: UITextField!
#IBOutlet weak var startingpoint: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
private func scrapeHTML(jiDoc: Ji) {
println("parsing...\n")
let bodyNode = jiDoc.xPath("//body")!.first!
var contentDivNode = bodyNode.xPath("//span[#style='font-size:1.3em']").first
if contentDivNode == nil {
print("unexpected format!")
}else{
var cdnArray = contentDivNode[1]
var cdn = cdnArray[0]! as String
self.resultLabel.text = cdn
// println(contentDivNode)
}
return
}
}

Answer 1

You can do something like:
#IBAction func calculate(sender: AnyObject) {
print("start scraping...")
let url = NSURL(string: "http://uberestimate.com/costs.php")
let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { data, response, error in
if data == nil || error != nil { // in Swift 2, I'd use `guard`, but I tried to keep this backward compatible
print(error)
return
}
dispatch_async(dispatch_get_main_queue()) {
self.scrapeHTML(data!)
}
}
task.resume()
}
private func scrapeHTML(data: NSData) {
print("parsing...\n")
let jiDoc = Ji(data: data, isXML: false)
if let contentDivNode = jiDoc?.xPath("//span[#style='font-size:1.3em']")?.first {
self.resultLabel.text = contentDivNode.content
}
}
I'm using the Swift 2.1 (and I infer from the presence of println that you must be using an earlier version), but I think this is largely the same regardless of Swift version.
BTW, notice that I am dispatching the update of the label back to the main queue (as you called scrapeHTML from a global queue, but UI updates must happen on the main thread). I'm also using NSURLSession rather than dispatching a synchronous network request to a global queue.