Comments on: The Objective-C Singleton

By: Jey350

Jey350 — Wed, 30 Jun 2010 17:50:06 +0000

Nice article !
For people who are interested I made a reusable singleton class on this blog:
http://www.devbypractice.com/reusable-singleton...

By: Petrus Ali Saputra

Petrus Ali Saputra — Tue, 25 May 2010 19:02:29 +0000

Hi, I've tried this code. But I got “error: 'VariableStore' undeclared (first use in this function)” message when trying to use it. Anything wrong? Plz help.

I rename MySingleton to VariableStore. Thanks.

By: Petrus Ali Saputra

Petrus Ali Saputra — Tue, 25 May 2010 14:02:29 +0000

Hi, I've tried this code. But I got “error: 'VariableStore' undeclared (first use in this function)” message when trying to use it. Anything wrong? Plz help.

I rename MySingleton to VariableStore. Thanks.

By: Douglas Bonneville

Douglas Bonneville — Thu, 25 Mar 2010 05:44:58 +0000

Where do you instantiate this from? I tried from inside viewDidLoad on a UIView, and was told in an IBAction method further up that the instance was undeclared…

Where do you instantiate to ensure all methods can access it?

By: Fireball

Fireball — Fri, 01 Jan 2010 17:13:39 +0000

[MySingleton sharedMySingleton].QQQ = [NSArray arrayWithObjects: @"test", nil];
I think this is the correct syntax.

How do I do something like [MySingleton sharedMySingleton] [QQQ objectAtIndex:0]; ?

thanks in advance

By: Fireball

Fireball — Fri, 01 Jan 2010 17:07:59 +0000

Thanks for the tutorial. Works perfectly. I'm new to ObjC programming for iphone.

i tried to have a NSArray instead of NSString except i dont know the syntax for accessing it.

[[MySingleton sharedMySingleton] [myArray arrayWithObjects: @"test", nil]];

How do i achieve this?

By: duponol

duponol — Wed, 09 Sep 2009 21:07:30 +0000

Hey Derek,

I'm embaressed to say it but I found my error, it was the second piece of code that diden't work:

NSLog("singleton: %@",[Global sharedMySingleton].test);

There is no @ in front of the "singleton: %@", I was so hang up in the singleton that I wasn't seeing clear. Sorry for your trouble and thanks for the reply and the tutorial.

Kind regards,
Olivier

By: Derek van Vliet

Derek van Vliet — Wed, 09 Sep 2009 18:43:04 +0000

duponol, when I copied your code into xcode it worked as expected. I see the following output in the console:

test has value: first assignment

Are you writing an iPhone app or another type of mac app?

By: duponol

duponol — Wed, 09 Sep 2009 18:07:30 +0000

By: Derek van Vliet

Derek van Vliet — Wed, 09 Sep 2009 15:43:04 +0000