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Asked: 2026-05-23T17:17:42+00:00

I want to show a Now Playing button in a UINavigationController’s bar. I have

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I want to show a Now Playing button in a UINavigationController’s bar.

I have a class (NowPlayingManager) that I am using to keep track of whether an audio file is currently being played. I use a notification posted in another class (AudioViewController) to indicate playing status. AudioViewController creates an instance of the NowPlayingManager with alloc/init and releases it. In NowPlayingManager’s target of the received notification I set NowPlayingManager’s isNowPlaying Boolean to YES.

When the audio stops playing I send another notification that sets the isNowPlaying bool to NO.

However, each time the class is initialized the bool is set to NO, which makes sense because it is a new instance of NowPlayingManager and the Now Playing button is never displayed.

How can I get the isNowPlaying bool to persist through all instances of my NowPlayingManager? Or, rather, Should I have the app delegate init the NowPlayingManager rather than AudioViewController so that only one instance is created?

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1 Answer

  1. Editorial Team

    You can of course define the isNowPlaying as class member + (BOOL) isNowPlaying. See
    Objective-C: how to declare a static member that is visible to subclasses? for more information on this.

    But as you said already it seems to be more useful to create just one instance i.e. the singleton pattern. I suggest Matt Galaghers posting about singletons and his downloadable SynthesizeSingleton.h:

    http://cocoawithlove.com/2008/11/singletons-appdelegates-and-top-level.html

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