Implement a pure virtual method in Objective-C

Question

I want to go to there. Seriously though, how does one implement a pure virtual method in an \"Apple\" way? Do you use a Protocol with your base class and throw exceptions on

Answer 1

A virtual method is a method whose behavior can be overridden within an inheriting class by a function with the same signature (i.e same name with same number of params and type of params).

Example:-

@implementation BaseClass

-(void)viewDidLoad
{
 [self virtualMethod:123];
}

-(void)virtualMethod:(int)param
{
 //implement this method in subclass
}

@end

////////////////////////////////////////////////////

@interface ChildClass:BaseClass
@end

@implementation ChildClass

-(void)virtualMethod:(int)param
{
 NSLog(@"There is no keyword "Virtual" in Objective C.");
}
@end

Output:-

"There is no keyword "Virtual" in Objective C."