How to create objects of protocol such that i can call the methods of it in Objective-C?

Question

Hi, I have a protocol say

@protocol MyProtocol
-(void)mload 
@end

with a method mload, I also have ClassA which has implemented that protocol method ie mload.

@implementation ClassA
-(void)mload {
    NSLog(@"ClassA-mload");
}
@end

Now I need to call that method in another class say ClassB using an instance of ClassA. How to do that?

Answer 1

In ClassB something like this, not sure how you're getting reference to ClassA obj but:

// obj is of type that implements protocol
id<MyProtocol> obj = [[ClassA alloc] init];
[obj load];


// should work as well because objective-c is dynamically typed so you can call
// any method on an object
id obj = [[ClassA alloc] init];
[obj load];