Question

I created a singleton called “GCTurnBasedMatchHelper”, which includes the following code in the header:

@property (nonatomic, retain) NSString *pick1;

In the implementation I have these lines:

#import "GCTurnBasedMatchHelper.h"
//Some implementation code in here...
@synthesize pick1;

- (void) pick{
int r = arc4random() % 2;
if (r==0) {
    pick1 =[[NSString alloc] initWithFormat:@"Askerer"];
    NSLog(@"%@", pick1);
} else {
    pick1 =[[NSString alloc] initWithFormat:@"Answerer"];
    NSLog(@"%@", pick1);
    }
}

How can I access the value of pick1 from another class implementation ViewController.m?
And how can I access other properties from ViewController.m in GCTurnBasedMatchHelper.m?

Thanks!

Answer 1

You can access the properties of your Singleton class from ViewController.m by doing something such as this:

[[GCTurnBasedMatchHelper sharedInstance] pick1];

Assuming, -sharedInstance is what the initialization method is for your Singleton, i.e:

+(GCTurnBasedMatchHelper*)sharedInstance {

   //Singleton setup here

}

The tricker bit, is Accessing properties that’re in ViewController.m from your Singleton. I’d recommend creating a Data Source or Delegate for your Singleton that returns your desired properties.

   -(NSMutableArray*)viewControllerProperty {

        return self.myViewControllerPropertyArray;

  }

Assuming -viewControllerProperty is a Delegate method for your singleton. In your singleton, you can now access ViewController class properties by invoking this from your singleton.

[self.delegate viewControllerProperty];

Of course, I didn’t show creating and or setting the delegate, nor none of the other obvious stuff like @synthesizing. I take it you can figure this out, as it’s not in the scope of your question.