Add SSID tracking

CHANGELOG

@@ -1,3 +1,4 @@
+"* **Breaking API** Add SSID notification"
 
 ### 0.0.3
 

Example/OSCKitExample/Base.lproj/Main.storyboard

@@ -24,17 +24,26 @@
                             <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="Kaz-P4-lJh">
                                 <rect key="frame" x="0.0" y="20" width="375" height="647"/>
                             </imageView>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="VZf-MU-5Pk">
+                                <rect key="frame" x="166" y="619" width="42" height="21"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
                         </subviews>
                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <constraints>
                             <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="Kaz-P4-lJh" secondAttribute="bottom" id="MPe-zE-dFp"/>
                             <constraint firstItem="Kaz-P4-lJh" firstAttribute="top" secondItem="y3c-jy-aDJ" secondAttribute="bottom" id="VM8-J8-hSO"/>
                             <constraint firstAttribute="trailing" secondItem="Kaz-P4-lJh" secondAttribute="trailing" id="aWi-oy-Xv2"/>
+                            <constraint firstItem="VZf-MU-5Pk" firstAttribute="centerX" secondItem="8bC-Xf-vdC" secondAttribute="centerX" id="oIW-pj-u3q"/>
                             <constraint firstItem="Kaz-P4-lJh" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leading" id="yoU-kH-bou"/>
+                            <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="VZf-MU-5Pk" secondAttribute="bottom" constant="27" id="zax-Zk-Daz"/>
                         </constraints>
                     </view>
                     <connections>
                         <outlet property="image" destination="Kaz-P4-lJh" id="OyD-J2-cEG"/>
+                        <outlet property="ssidLabel" destination="VZf-MU-5Pk" id="cQ9-Tj-0xv"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>

Example/OSCKitExample/ViewController.swift

@@ -10,8 +10,11 @@ import UIKit
 import OSC
 
 class ViewController: UIViewController {
+    @IBOutlet weak var ssidLabel: UILabel!
     @IBOutlet weak var image: UIImageView!
 
+    var ssidObservationCancellation: (() -> Void)?
+
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view, typically from a nib.
@@ -20,8 +23,17 @@ class ViewController: UIViewController {
             self.image.image = image
         }
 
+        ssidObservationCancellation = OSCKit.shared.ssid {[weak self] (ssid) in
+            self?.ssidLabel.text = ssid
+        }
+
     }
 
+    deinit {
+        self.ssidObservationCancellation?()
+    }
+
+
     override func didReceiveMemoryWarning() {
         super.didReceiveMemoryWarning()
         // Dispose of any resources that can be recreated.

Source/OSCKit.swift

@@ -6,7 +6,6 @@
 //  Copyright © 2017 Tappollo Inc. All rights reserved.
 //
 import SwiftyyJSON
-import SystemConfiguration.CaptiveNetwork
 
 public class OSCKit {
     public static let shared = OSCKit()
@@ -22,23 +21,5 @@ public class OSCKit {
 
     private init() { }
 
-    public func isConnectedToDeviceWiFi(withPrefix prefix: String) -> Bool {
-        return SSID.current?.hasPrefix(prefix) == true
-    }
 }
 
-struct SSID {
-    static var current: String? {
-        if let interfaces = CNCopySupportedInterfaces() {
-            for i in 0..<CFArrayGetCount(interfaces) {
-                let interfaceName: UnsafeRawPointer = CFArrayGetValueAtIndex(interfaces, i)
-                let rec = unsafeBitCast(interfaceName, to: AnyObject.self)
-                let unsafeInterfaceData = CNCopyCurrentNetworkInfo("\(rec)" as CFString)
-                if let interfaceData: NSDictionary = unsafeInterfaceData, let ssid = interfaceData["SSID"] as? String {
-                    return ssid
-                }
-            }
-        }
-        return nil
-    }
-}

Source/SSID.swift

@@ -0,0 +1,81 @@
+//
+//  SSID.swift
+//  Pods
+//
+//  Created by Zhigang Fang on 5/15/17.
+//
+//
+
+import Foundation
+import SystemConfiguration.CaptiveNetwork
+
+final class SSID: NSObject {
+
+    static let shared = SSID()
+
+    private var subscribers: [String: (String?) -> Void] = [:] {
+        didSet {
+            if subscribers.count > 0 {
+                self.startTracking()
+            } else {
+                self.stopTracking()
+            }
+        }
+    }
+
+    private var previousSSID: String?
+
+    private var ssidTrackingTimer: Timer?
+
+    private func startTracking() {
+        guard ssidTrackingTimer == nil else { return }
+        self.ssidTrackingTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.timerUpdated), userInfo: nil, repeats: true)
+        self.ssidTrackingTimer?.fire()
+    }
+
+    private dynamic func timerUpdated() {
+        let currentSSID = self.current
+        if self.previousSSID != currentSSID {
+            self.previousSSID = currentSSID
+            self.subscribers.forEach({ (pair) in
+                pair.value(currentSSID)
+            })
+        }
+    }
+
+    private func stopTracking() {
+        self.ssidTrackingTimer?.invalidate()
+        self.ssidTrackingTimer = nil
+    }
+
+    func subscribe(onChange subscriber: @escaping (String?) -> Void) -> () -> Void {
+        let uuid = UUID().uuidString
+        subscribers[uuid] = subscriber
+        return {
+            self.subscribers[uuid] = nil
+        }
+    }
+
+    private var current: String? {
+        if let interfaces = CNCopySupportedInterfaces() {
+            for i in 0..<CFArrayGetCount(interfaces) {
+                let interfaceName: UnsafeRawPointer = CFArrayGetValueAtIndex(interfaces, i)
+                let rec = unsafeBitCast(interfaceName, to: AnyObject.self)
+                let unsafeInterfaceData = CNCopyCurrentNetworkInfo("\(rec)" as CFString)
+                if let interfaceData: NSDictionary = unsafeInterfaceData, let ssid = interfaceData["SSID"] as? String {
+                    return ssid
+                }
+            }
+        }
+        return nil
+    }
+
+}
+
+extension OSCKit {
+
+    public func ssid(changed: @escaping (String?) -> Void) -> () -> Void {
+        return SSID.shared.subscribe(onChange: changed)
+    }
+
+}