Question

I want to pass an NSInteger argument to a method called using performSelector:WithObject:afterDelay, so I have this code:

   id arg = [NSNumber numberWithInt:myIdentifier]; 
   [self performSelector:@selector(myMethod:) withObject:arg afterDelay:kDuration];


    - (void) myMethod: (id) identifier
    {
    ...
    }

Within myMethod:, how do I convert the identifier from an id to an NSInteger?

I’ve seen this previous question:
SEL performSelector and arguments

but I don’t understand myMethodForNumber: – how is that used to unbox the number?

Answer 1

myMethod can accept the NSNumber as the parameter. You can then get the integer value by using the NSNumber instance method.

- (void)myMethod:(NSNumber *)number {
    NSInteger value = [number integerValue];
}