Question

I am completely new to objective-c and I am currently in the learning process,
I have a parent class A which a property a,
I am trying to access the property in a subclass B,
When I access the property and assign a value like this

[self a:3];

it does complain No visible @interface for B declares selector a

but if I access it to read from it like
int something = [self a];
then it does not complain.

I understand the recommended way to access properties is using the . between object and property, but technically speaking it should work with message style call. but it’s not, so please advise me on this.

my code is like this

// Test class A
@interface A : NSObject

@property int a;

-(void) initMe; 

@end

@implementation A

@synthesize a;

-(void) initMe
{
 NSLog(@"I am in A");
}
@end

//-------------------------

@interface B : A

-(void) initEx; 

@end

@implementation B

-(void) initEx
{
    // This line gives a problem as I mentioned above
    [self a:3];
    NSLog(@"In child class B");
}

@end

///-----------------------

Answer 1

[self a:3]; is the wrong syntax. If you want to call the setter method, it should be:

[self setA:3];