Question

I am working on an iphone app with push notifications. My question is how to call a function from a classB when i receive a push notification without creating an instance of that classB nor using static method?

Many thanks 🙂

Answer 1

You will need to hold a reference to classB from within the object that receives the push notification:

// The header file of the class that receives the notification

@class classB;

@interface MyNotifiedClass : NSObject
{
    classB *_classB;
}

@property (retain, nonatomic, readwrite) classB *classB;

// The implementation file of the class that receives the notification

@implementation MyNotifiedClass

....

@synthesize classB = _classB;


- (void)theMethodThatReceivesTheNotification:(whatever)
{
    [_classB doSomethingNowPlease];
}

You will obviously have to set the instance of classB in this class before it will work:

// Someplace outside both classes (assuming _classB points to an instance of classB
// and _myNotifiedClass points to an instance of MyNotifiedClass)

[_myNotifiedClass setClassB:_classB];