I am hoping you can help me. I'm exceptionally new to Xcode and Swift but am trying to skill up fast. I am mixing the learning of the basic language with some real examples. I'm getting there but i'm struggling with a little project.
Basically, i'm writing a little sockets client that is making a connection to a sockets based server. After scouring the web, I finally found what I believe is the right approach - to make use of the NSStream functionality.
In my attached view controller code (which is attached to a basic view with a couple of labels), the code works, in that it connects and can receive data from the server; the println() call in the stream function works.
The problem I am having is that as soon as my application receives any data, it seems to block the UI. I do see the data in the All Output window, but my interface is no longer working. For example, I have a button (as part of the navigation controller), that works until I receive data...
I am using the following to create the server on my OS X machine:
nc -k -l 2444
... and here is my view controller code
import UIKit
class VCMainView: UIViewController, NSStreamDelegate{
let serverAddress: String = "127.0.0.1"
let serverPort: Int = 2444
var inputStream: NSInputStream?
var outputStream: NSOutputStream?
@IBOutlet weak var lblScreenLabel1: UILabel!
@IBOutlet weak var lblScreenLabel2: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.lblScreenLabel1.text = "Connecting"
self.lblScreenLabel2.text = "Please Wait..."
self.connectSocket()
} // func
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
} // func
func connectSocket() {
NSStream.getStreamsToHostWithName(self.serverAddress, port: self.serverPort, inputStream: &self.inputStream, outputStream: &self.outputStream)
if inputStream != nil && outputStream != nil {
inputStream!.delegate = self
outputStream!.delegate = self
inputStream!.scheduleInRunLoop(.mainRunLoop(), forMode: NSDefaultRunLoopMode)
outputStream!.scheduleInRunLoop(.mainRunLoop(), forMode: NSDefaultRunLoopMode)
inputStream!.open()
outputStream!.open()
} // if
} // func
func stream(aStream: NSStream, handleEvent eventCode: NSStreamEvent) {
switch (eventCode) {
case NSStreamEvent.ErrorOccurred:
break
case NSStreamEvent.EndEncountered:
break
case NSStreamEvent.None:
break
case NSStreamEvent.HasBytesAvailable:
var buffer = [UInt8](count: 4096, repeatedValue: 0)
if ( aStream == inputStream) {
let hasBytes = self.inputStream!.hasBytesAvailable
while ( hasBytes ) {
var len = self.inputStream!.read(&buffer, maxLength: buffer.count)
if(len > 0){
var output = NSString(bytes: &buffer, length: buffer.count, encoding: NSUTF8StringEncoding)
if ("" != output){
println(output)
} // if
} // if
} // while
} // if
break
case NSStreamEvent.allZeros:
break
case NSStreamEvent.OpenCompleted:
break
case NSStreamEvent.HasSpaceAvailable:
break
default:
break
} // switch
} // func
} // class
If somebody could help point me in the right direction, I would really appreciate that...
Thanks in advance! Jon
