PrinterServiceBrowser.swift

import Foundation

class PrinterServiceBrowser: NSObject, NSNetServiceDelegate, NSNetServiceBrowserDelegate {
    var services: NSMutableArray!
    var serviceBrowser: NSNetServiceBrowser!
    var service: NSNetService!
    
    var onFinish: (NSMutableArray -> Void)
    init(onFinishBrowsing: NSMutableArray -> Void) {
        self.onFinish = onFinishBrowsing
    }
    
    func startBrowsing() {
        if (services != nil) {
            services.removeAllObjects()
        } else {
            services = NSMutableArray()
        }
        
        serviceBrowser = NSNetServiceBrowser()
        serviceBrowser.delegate = self
        serviceBrowser.searchForServicesOfType("_printer._tcp.", inDomain: "")
        
    }
    
    func netServiceBrowser(browser: NSNetServiceBrowser, didFindService service: NSNetService, moreComing: Bool) {
        services.addObject(service)
        print(service.name)
        connect()
        if !moreComing {
            self.onFinish(self.services)
        }
    }
    
    func connect() {
        service = services.firstObject! as! NSNetService
        service.delegate = self
        service.resolveWithTimeout(30.0)
    }
    
    func netService(sender: NSNetService, didNotResolve errorDict: [String : NSNumber]) {
        service.delegate = nil
    }
    
}