asynchronous - Code after NSURLSession runs before session is over - Swift -


i have app accesses website , downloads html site, converts string, grabs information string, , uses app. problem code extracting string runs before data can loaded. tried putting code in completion handler, either didn't fix problem, or did wrong. here code: 

for var = 0; <= textviewcontentarray.count - 1; i++ {     var dontcount = false     istaskcomplete = false     var currentword = textviewcontentarray[i]             let url = nsurl(string: "http://words.bighugelabs.com/" + currentword)              var request: nsurlrequest = nsurlrequest(url: url!)             let config = nsurlsessionconfiguration.defaultsessionconfiguration()             let session = nsurlsession(configuration: config)              let task : nsurlsessiondatatask = session.datataskwithrequest(request, completionhandler: {(data, response, error) in                  if error == nil {                     //getting string url data                     let urlcontent = nsstring(data: data!, encoding: nsutf8stringencoding)!                      if urlcontent.containsstring("word not found.") == false && urlcontent.containsstring("i couldn't find that.") == false && urlcontent.containsstring("not found") == false {                         //extracting needed info string                         let startpointarray = urlcontent.componentsseparatedbystring("ul class=\"words\">")                          let url1 = startpointarray[1]                          let endpointarray = url1.componentsseparatedbystring("</ul><h3>sounds kind of like")                         var wordsbodystring = endpointarray[0]                          wordsbodystring = wordsbodystring.stringbyreplacingoccurrencesofstring("</a></li>", withstring: "")                         let wordsbasicarray = wordsbodystring.componentsseparatedbystring("<li><a href=\"/")                          var wordsadvancedarray: [string] = []                          var = 0; <= wordsbasicarray.count - 1; i++ {                             var currentwordarray = wordsbasicarray[i].componentsseparatedbystring("\">")                              wordsadvancedarray.append(currentwordarray[0] as! string)                          }                          var = 0; <= wordsadvancedarray.count - 1; i++ {                             if count(wordsadvancedarray[i]) < count(currentword) {                                 shorterwordsarray.append(wordsadvancedarray[i])                             }                         }                          shorterwordsarray.removeatindex(0)                          shorterwordsarrayglobal[i] = shorterwordsarray                          })                         task.resume() }

the urlcontent constant assigned value before website data loaded. need way stop happening. new programing, keep in mind answer, thank in advance.


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