Essential Books

Basic Protocol Definition

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Defining a new protocol: 

@protocol NewProtocol

- (void)protocolMethod:(id)argument;

- (id)anotherMethod;

@end
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Protocols:
*Protocols
*Optional and required methods
*Checking existance of optional method implementations
*Basic Protocol Definition
*Conforming to Protocols
*Forward Declarations
*Check conforms Protocol
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