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Creating our own optional methods in protocol

Anonymous User 1474 30-Oct-2015
I have notice that optional methods in several protocols are defined in the iPhone SDK, such as the UIActionSheetDelegate protocol.
So my problem is that can I define a protocol of my own, and set a few of the methods as optional?
iphone iphone  ios  objective c 
Updated on 30-Oct-2015
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Tarun Kumar

Tarun Kumar

30-Oct-2015

When we create a Protocol then we need to mark '@optional' keyword, because it is responsible to create our own optional method.
Corresponding to the '@optional' keyword, here is another keyword @required, used when we want any method necessary in our code, using @optional and @required keywords we can do partition in protocol into sections and by the way by default keyword is @required in any protocol.

@protocol ProtocolSample
 - (void)defaultRequiredMethod;
@optional
  - (void)optionalMethod1;
  - (void)optionalMethod2;
@required
  - (void)requiredMethod;
@end

 

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