Blocks for Presenting and Dismissing View Controllers instead of Protocols and Delegate callbacks

Blocks presenting ViewControllers

DETAIL VIEW CONTROLLER - PRESENTED VC
#instead of defining the protocol with its required callback methods and delegate property 
 
# DetailViewController.h
typedef void (^DetailViewControllerCompletionBlock)(BOOL success);
@property (nonatomic, copy) DetailViewControllerCompletionBlock completionBlock;
 
# Instead of falling delegate call cakes from IBActions asociares with UI buttons... Assign the BOOL variable of the block
# DetailViewController.m
- (IBAction)cancel:(id)sender {
if (self.completionBlock != nil) self.completionBlock(NO);
}
- (IBAction)done:(id)sender {
...
if (self.completionBlock != nil) self.completionBlock(YES);
 
#MASTER VIEW CONTROLLER - PRESENTER VC
# Remove the protocol conforming statement and change prepare for segue...
# What you did here is move the contents from detailViewControllerDidCancel: and detailViewControllerDidClose: into the prepareForSegue:.
 
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"ShowDetail"]) {
  
  // 0. Get the Destination VC as usual
  DetailViewController *controller = segue.destinationViewController;
  
  // 1. Pass the Block that will be executed instead of the delegate callbacks
  controller.completionBlock = ^(BOOL success) 
  {
    // If "Done Button" was pressed (success=YES); No thing is done in case that "Cancel Button" was pressed (success=NO)
    if (success) {
      // Save DATA from the detail VS into the model to save changes since success receives the "Done button"
    }
    
    // Dissmiss the DetailVC
    [self dismissViewControllerAnimated:YES completion:nil]; 
  };
 
  // 2.Do what you must do to prepare the segue to fire the destination VC here
};