How to Create Custom Delegate

// MyViewController.h:


@protocol MyProtocolName;

@interface MyViewController: UIViewController

@property (nonatomic, weak) id delegate;


@protocol MyProtocolName

-(void)optionalDelegateMethodTwo:(NSString *)withArgument;

@end // end of delegate protocol

In the implementation file, anytime you want to call a delegate method, first check to see if the delegate is set, and if it responds to the selector. Then call the method:

if (self.delegate && [self.delegate respondsToSelector:@selector(optionalDelegateMethodOne)]) {
[self.delegate optionalDelegateMethodOne];

Now for classes you want to conform to your new protocol, include the header file and delegate protocol in the @interface:

#include “MyViewController.h” // needed to include the @delegate protocol info

@interface FavoritesViewController : UIViewController