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For example, there are functions named -(void)Foo, and -(void)Foo:(id)sender.
The -(void)Foo:(id)sender can get the caller from parameter, and my question is, how to get caller from -(void)Foo? Is there any way to get the caller?
Please have a look at Objective C find caller of method. For what do you need it? The (id)sender parameter is passed directly by the method sending the message, there is no magic involved.