Comments on: Global Variables in iPhone Objective-C

By: Nelson Rodrigues

Nelson Rodrigues — Thu, 08 Sep 2011 10:49:00 +0000

Do we need to release the global variables? Thanks!

By: maniacdev

maniacdev — Sat, 03 Sep 2011 21:48:00 +0000

nope.. it’s a static variable so it will not be allocated and initialized every time you call the method.

By: maniacdev

maniacdev — Sat, 03 Sep 2011 21:47:00 +0000

Nope. it will only instantiate if myInstance is nil.

By: Severson

Severson — Fri, 02 Sep 2011 23:50:00 +0000

shouldn’t the “static ClassName *myInstance = nil” be outside of the Global method?? Else, you’d have “myInstance” be nil every time you call it, thus always allocating and initializing the class every time you call the method.

idk, maybe I’m missing something.

By: Severson

Severson — Fri, 02 Sep 2011 23:43:00 +0000

wait… won’t it re-allocate and re-initiate the class every time you call the “sharedInstance” method, thus giving you a blank slate every time you want to use your variable. yeah I’m confused.

By: josevin

josevin — Thu, 23 Jun 2011 06:09:10 +0000

thank you….i am searching for this…….

By: bjorn

bjorn — Tue, 24 May 2011 20:27:05 +0000

In the header you need to add something like:
@propery(nonatomic) variabletype variable;

You also need this is implementation file:
@synthesize variable;

If not, you will get “VariableStore may not respond to variableName”.

By: kPK

kPK — Thu, 14 Apr 2011 07:06:20 +0000

Pretty good stuff ! Works like charm !!
Thanks

By: Chu

Chu — Mon, 16 Aug 2010 23:15:00 +0000

Hi
Really thanks it works and better than my F…ing global … Thks a lot

By: Frank

Frank — Wed, 16 Jun 2010 14:52:19 +0000

I make use of 4 global variable parameters. Input once and used throughout three view controllers. Never modified. I tried to use your singleton and sought advice from Stack Overflow on how best to get four UITextfields (the parameters) into the singleton variables. I came in for some criticism for a) using a singleton for such a piffling requirement and b) for not complying with the Apple recommended Design Pattern for a singleton. Can’t win. Don’t use Globals and don’t use Singletons for program-wide use.

I ended up using 4 Globals and haven’t looked back. So, when is it correct/incorrect to use a singleton?