Question

Okay so let’s say I have class A…

CLASS A has a method that gets called as soon as the user makes an in app purchase.

-(void) didMakePurchase { ...  }

(VIEW CONTROLLER) CLASS B is the View Controller for the current scene. Inside class B I have a function that creates a UIAlertView that basically thanks the user for making the purchase.

-(void) createAlertViewAfterSuccessfulPurchase {  ...create UIAlertView... }

Goal/Problem: I want to be able to call the createAlertViewAfterSuccessfulPurchase method inside the didMakePuchase method which is in Class B.

What I’ve Tried: I tried importing class A and creating an object of Class B in Class A just so I could call that method, but it didn’t work (my guess is because Class B is a view controller).

Answer 1

Solution: Make Class B a delegate of Class A and then do:

[myDelegate createAlertViewAfterSuccessfulPurchase:myParams]

To declare the delegate:

In class A:

.h

@protocol myProtocol;

@interface ClassA : UIView
{

}

@property (nonatomic, assign) id<myProtocol> delegate;

@protocol myProtocol <NSObject>

- (void)createAlertViewAfterSuccessfulPurchase;

@end

.m

self.delegate = classBInstance.

to call:

[delegate createAlertViewAfterSuccessfulPurchase]

in Class B:

.h

@interface ClassB : NSObject <myProtocol>

.m

implementation of:

-(void) createAlertViewAfterSuccessfulPurchase {  ...create UIAlertView... }