Question

Greetings,

I’m looking at Matt Gallagher’s macro for creating singleton classes. http://cocoawithlove.com/2008/11/singletons-appdelegates-and-top-level.html

Basically, I have an app with multiple views and I want to be able to access “global” data from each of these views using a singleton class.

I basically have three strings I want to access in this class: NSString *uname, NSString *details and NSString *selectedDetails.

Do I need to make three singleton classes with a static variable in each?

Also, how do I get and set the string variables uname, details and selectedDetails?

I’m a bit mixed up with all this singleton stuff (I only encountered such things today!) and I was wondering if anyone could point me in the right direction.

Many thanks in advance,

Here is some code I’ve done:

#import <Foundation/Foundation.h>

@interface Details : NSObject{

}
+(XXX *)sharedXXX;
@end


#import "Details.h"
#import "SynthesizeSingleton.h"

@implementation Details
SYNTHESIZE_SINGLETON_FOR_CLASS(XXX);
@end

Answer 1

Do I need to make three singleton classes with a static variable in each?

No. Just create one that has all three.

Also, how do I get and set the string variables uname, details and selectedDetails?

You get a reference to your singleton, usually with something like the following:

MySingleton *singleton = [MySingleton sharedInstance];

Then you use it as you would any other object:

singleton.uname = @"Example";

Are you sure you really need a singleton though? If it’s user data, what about storing it with NSUserDefaults?