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Calling A Method With A Delegate in Objective-C (iOS)
#import <UIKit/UIKit.h>

@protocol ViewControllerDelegate <NSObject>

-(void)didReceiveMessage:(NSString *)string;

@end

@interface ViewController : UIViewController <ViewControllerDelegate>;

@end

#import "ViewController.h"

@implementation ViewController

-(void)didReceiveMessage:(NSString *)string{
  NSLog(@"BANANAS");
}

@end

#import <UIKit/UIKit.h>

@protocol ViewControllerDelegate;

@interface EditableViewController : UIViewController

@property (nonatomic, weak) id<ViewControllerDelegate> delegate;

@property (nonatomic, weak) IBOutlet UITextField *TextField;
@property (nonatomic, weak) IBOutlet UIButton *SendTextToViewController;

- (IBAction)SendTextToViewController:(id)sender;

@end

#import "EditableViewController.h"
#import "ViewController.h"

@implementation EditableViewController

@synthesize delegate;
@synthesize TextField;
@synthesize SendTextToViewController;


- (IBAction)SendTextToViewController:(id)sender {
               [delegate didReceiveMessage:TextField.text];
}

- (void)viewDidUnload {
          [self setTextField:nil];
          [super viewDidUnload];
}
@end