didBecomeActive un-pauses game - ios

Question

I am pausing my game with a willResignActive notification, and it seems to pause the game, but when didBecomeActive is called, it seems to un-pause on its own.
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector(applicationWillResign)
name:UIApplicationWillResignActiveNotification
object:NULL];
- (void) applicationWillResign {
self.scene.view.paused = TRUE;
NSLog(#"About to lose focus");
}
How do I get it to stay paused? Do I actually need to pause it in my AppDelegate?

Answer 1

Here's a way to keep the view paused after returning from background mode. It's a bit of a hack, but it does work.
1) Define an SKView subclass with a boolean named stayPaused...
#interface MyView : SKView
#property BOOL stayPaused;
#end
#implementation MyView
// Override the paused setter to conditionally un-pause the view
- (void) setPaused:(BOOL)paused
{
if (!_stayPaused || paused) {
// Call the superclass's paused setter
[super setPaused:paused];
}
_stayPaused = NO;
}
- (void) setStayPaused
{
_stayPaused = YES;
}
#end
2) In the storyboard, change the class of the view to MyView
3) In the view controller, define the view as MyView
4) Add a notifier to set the stayPaused flag
#implementation GameViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Define view using the subclass
MyView * skView = (MyView *)self.view;
// Add an observer for a method that sets the stay pause flag when notified
[[NSNotificationCenter defaultCenter] addObserver:skView selector:#selector(setStayPaused)
name:#"stayPausedNotification" object:nil];
...
5) In AppDelegate.m, post a notification to set the stay paused flag when the app becomes active
- (void)applicationDidBecomeActive:(UIApplication *)application {
[[NSNotificationCenter defaultCenter] postNotificationName:#"stayPausedNotification" object:nil];
}