Protocol_Delegate.md

What are protocols and delegates?

• Protocol : An interface (in Java)
• Delegate : An object that implements an interface(protocol).
• Benefit : Reduced dependencies between objects.

Delegate Pattern Steps + Syntax

1. Defining a Protocol

@protocol ProtocolName<ProtocolToExtend>
@optional
// Optional methods
@required
// Required methods
@end

2. Conforming to a Protocol (Delegate Class)

// in .h header file
@interface ClassName: SuperClass <ProtocolName>

// or in .m implementation file (if you want to hide that the class is conforming to the protocol)
@interface ClassName () <ProtocolName>

3. You implement the methods on your (delegate) class
4. When referring to an object that implements a protocol, do this: @property id <ProtocolName> delegate