Calling a method from another class in Objective C

Question

I have 2 classes, say class A and class B. Class B is created in class A. I have a method in class A, which needs to be executed in both class A and class B. Calling the me

Answer 1

you can do this using notificationCenter. e.g

Class A .h

@interface A: UIViewController
-(void)classAandBMethod;
@end

.m

@implementation
-(void)willPushToClassB
{
 [[NSNotificationCenter defaultCenter] removeObserver:self];
 [[NSNotificationCenter defaulCenter] addObserver:self selector:@selector(classAandBMethod) name:@"classAandBMethod_name" object:nil];
 //push class B
 ClassB *b = [ClassB alloc] initWithNibName:@"ClassB" ........];
 [self.navigationController pushViewController:b animated:YES];
}
@end

when you call the method in ClassB:

//this method in classB will call the method in Class a.
-(void)callMethodInClassA{
 NSNotification *subject = [NSNotification defaultCenter];
 [subject postNotificationName:@"classAandBMethod_name" object:nil userinfo:whatEverInfoYouWant_dict];
 [subject removeObserver:self];
}