added startUnity and stopUnity methods to be able to pause unity and stop it from consuming cpu cycles and battery life

Author: Martin Straub

README.md

@@ -254,6 +254,7 @@ First add the following variable to your `AppDelegate`
 var currentUnityController: UnityAppController!
 ```
 Now we need to initialize and proxy through the calls to the `UnityAppController`.
+
 All said and done you will be left with the following:
 
 ```swift
@@ -262,39 +263,73 @@ All said and done you will be left with the following:
 //
 // Created by Adam Venturella on 10/28/15
 //
+// Updated by Martin Straub on 15/03/2017.
+// Added some stuff to pause unity in order to stop consuming cpu cylces and battery life, when not being displayed. 
+// Indeed, unity will still sit in memory all the time, but that seems to be a more complex thing to solve. 
+// Just use `startUnity` and `stopUnity` for running/pausing unity (see also ViewController example below).
+//
 
 import UIKit
 
 class AppDelegate: UIResponder, UIApplicationDelegate {
-
- var window: UIWindow?
- var currentUnityController: UnityAppController!
-
-
+ var currentUnityController: UnityAppController?
+ var application: UIApplication?
+ var isUnityRunning = false
+ 
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {
+ self.application = application
  currentUnityController = UnityAppController()
- currentUnityController.application(application, didFinishLaunchingWithOptions: launchOptions)
+ currentUnityController!.application(application, didFinishLaunchingWithOptions: launchOptions)
+ 
+ // first call to startUnity will do some init stuff, so just call it here and directly stop it again
+ startUnity()
+ stopUnity()
+ 
  return true
  }
-
+ 
  func applicationWillResignActive(_ application: UIApplication) {
- currentUnityController.applicationWillResignActive(application)
+ if isUnityRunning {
+ currentUnityController?.applicationWillResignActive(application)
+ }
  }
-
+ 
  func applicationDidEnterBackground(_ application: UIApplication) {
- currentUnityController.applicationDidEnterBackground(application)
+ if isUnityRunning {
+ currentUnityController?.applicationDidEnterBackground(application)
+ }
  }
-
+ 
  func applicationWillEnterForeground(_ application: UIApplication) {
- currentUnityController.applicationWillEnterForeground(application)
+ if isUnityRunning {
+ currentUnityController?.applicationWillEnterForeground(application)
+ }
  }
-
+ 
  func applicationDidBecomeActive(_ application: UIApplication) {
- currentUnityController.applicationDidBecomeActive(application)
+ if isUnityRunning {
+ currentUnityController?.applicationDidBecomeActive(application)
+ }
  }
-
+ 
  func applicationWillTerminate(_ application: UIApplication) {
- currentUnityController.applicationWillTerminate(application)
+ if isUnityRunning {
+ currentUnityController?.applicationWillTerminate(application)
+ }
+ }
+ 
+ func startUnity() {
+ if !isUnityRunning {
+ isUnityRunning = true
+ currentUnityController!.applicationDidBecomeActive(application!)
+ }
+ }
+ 
+ func stopUnity() {
+ if isUnityRunning {
+ currentUnityController!.applicationWillResignActive(application!)
+ isUnityRunning = false
+ }
  }
 }
 
@@ -344,34 +379,35 @@ file for me attached to a storyboard. Here is how I hooked up my little demo:
 // ViewController.swift
 //
 // Created by Adam Venturella on 10/28/15.
+// Updated by Martin Straub on 15/03/2017.
 //
 
 import UIKit
 
 class ViewController: UIViewController {
-
- @IBAction func onLoadUnity(sender: AnyObject) {
- loadUnity()
- }
-
- @IBAction func onCallUnity(sender: AnyObject) {
- UnitySendMessage("EventBus", "Trigger", "Hello World")
- }
-
- func loadUnity(){
-
- let unityView = UnityGetGLView()
-
- self.view.addSubview(unityView)
- unityView.translatesAutoresizingMaskIntoConstraints = false
-
+ var unityView: UIView?
+ 
+ @IBAction func startUnity(sender: AnyObject) {
+ let appDelegate = UIApplication.shared.delegate as! AppDelegate
+ appDelegate.startUnity()
+ 
+ unityView = UnityGetGLView()!
+ 
+ self.view!.addSubview(unityView!)
+ unityView!.translatesAutoresizingMaskIntoConstraints = false
+ 
  // look, non-full screen unity content!
  let views = ["view": unityView]
- let w = NSLayoutConstraint.constraintsWithVisualFormat("|[view]-20-|", options: [], metrics: nil, views: views)
- let h = NSLayoutConstraint.constraintsWithVisualFormat("V:|-75-[view]-50-|", options: [], metrics: nil, views: views)
-
+ let w = NSLayoutConstraint.constraints(withVisualFormat: "|-20-[view]-20-|", options: [], metrics: nil, views: views)
+ let h = NSLayoutConstraint.constraints(withVisualFormat: "V:|-75-[view]-50-|", options: [], metrics: nil, views: views)
  view.addConstraints(w + h)
  }
+ 
+ @IBAction func stopUnity(sender: AnyObject) {
+ let appDelegate = UIApplication.shared.delegate as! AppDelegate
+ appDelegate.stopUnity()
+ unityView!.removeFromSuperview()
+ }
 }
 
 ```

Unity.xcconfig

@@ -21,6 +21,7 @@ SWIFT_OBJC_BRIDGING_HEADER = UnityBridge.h;
 OTHER_CFLAGS = -DINIT_SCRIPTING_BACKEND=1;
 CLANG_CXX_LANGUAGE_STANDARD = c++11;
 CLANG_CXX_LIBRARY = libc++;
+CLANG_ENABLE_MODULES = NO;
 CLANG_WARN_BOOL_CONVERSION = NO;
 CLANG_WARN_CONSTANT_CONVERSION = NO;
 CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES;