Comments on: Global Variables in iPhone Objective-C

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?

By: dpmguise

dpmguise — Thu, 10 Jun 2010 22:05:05 +0000

Great stuff, concise and simple.

By: Petrus Ali Saputra

Petrus Ali Saputra — Tue, 25 May 2010 12:01:51 +0000

Hi, I’m pretty new with Obj C. Every class that I know, always have dealloc method. Should I put dealloc in this Singleton? Thanks.

By: Daniel

Daniel — Mon, 17 May 2010 13:02:45 +0000

Hi, I’m having the same problem as Sean:
– “VariableStore may not respond to variableName (messages without a matching method signature will be assumed to return id and accept ‘…’ as arguments)

I’m clearly missing some step, but which one?

Thanks
Daniel

By: John

John — Tue, 11 May 2010 08:39:46 +0000

That post came out several months after mine so clearly they just copied. Thanks for pointing that out.

By: nico

nico — Mon, 10 May 2010 11:24:43 +0000

btw: who is the thief ?
http://www.picksourcecode.com/ps/ct/161183.php

(@mod: you dont have to make this post public)

By: nico

nico — Mon, 10 May 2010 11:09:57 +0000

i have searched for a solution like this, but – maybe i interpreted it wrong – i don’t get the initialization at // initialize variables here to work
in the .m i have made this:

@implementation VariableStore
//synthesize [3]
@synthesize globalerstring;

+ (VariableStore *)sharedInstance
{….

in the .h
#import

@interface VariableStore : NSObject
{
// Place any “global” variables here [1]
NSString *globalerstring;

}
// message from which our instance is obtained
+ (VariableStore *)sharedInstance;

//properties [2]

@property (nonatomic,retain) NSString *globalerstring;

@end

maybe i haven’t understood the principle in the right way. could anybody do one example for any variable ?

By: Charles

Charles — Tue, 10 Nov 2009 21:01:47 +0000

Thanks so much for this tip. I've been trying for a while to get the singleton to work.

By: Charles

Charles — Tue, 10 Nov 2009 13:01:47 +0000

Thanks so much for this tip. I've been trying for a while to get the singleton to work.

By: Zheng

Zheng — Wed, 14 Oct 2009 20:50:45 +0000

Nice, thanks for sharing this