Error compiling with ARC when runtime programming dynamic method

Question

I am trying to do some runtime programmation on Objective-C. In order to do this I override the resolveClassMethod method.

Unfortunately I come up with some

Answer 1

In your call

NSLog(@"How are you , %@", [Test dynamic]);

the ARC compiler does not know the return type of the method. But ARC needs to know if the method returns an object to add the appropriate retain/release calls for managing the lifetime.

Even without ARC you get a compiler warning

class method '+dynamic' not found (return type defaults to 'id')

but the ARC compiler is more strict.

You can call

NSLog(@"How are you , %@", [[Test class] performSelector:@selector(dynamic)]);

because performSelector returns an id. For functions returning anything other than an object you can use NSInvocation.

Alternatively, you can declare the dynamic method using a Class Extension:

@interface Test (DynamicMethods)
+ (NSString *)dynamic;
@end