Objective C Block Sample

MyUITableViewController.h

typedef void (^Completion)(void);//block definition

@interface MyUITableViewController : UITableViewController

@property (nonatomic, copy) NSString* myTitle;
@property (readwrite, copy) Completion completion;

-(MyUITableViewController *)initWithTitle: (NSString *) _myTitle
                               completion: (Completion) _completion;
-(void)back;

@end

MyUITableViewController.m

@implementation MyUITableViewController

@synthesize myTitle, completion;

-(MyUITableViewController *)initWithTitle: (NSString *) _myTitle
                               completion: (Completion) _completion 
{
    self = [super initWithNibName: @"MyUITableViewController" 
                           bundle: Nil];
    if (self) {

       self.myTitle = _myTitle;
       self.completion = _completion;
    }
    return self;
}

-(void)back 
{
        [self dismissViewControllerAnimated: YES 
                                 completion: self.completion];
}
@end

UsingObjectiveCBlockTest.m

@implementation UsingObjectiveCBlockTest

-(void)usingBlockTest
{
    MyUITableViewController* controller = [[MyUITableViewController alloc] 
                                                 initWithTitle: @"Block sample"
                                                    completion: ^{
                                                                   NSLog(@"Im Batman! |\_/|"); //using block
                                                                 }}];

     self.navigationController = [[UINavigationController alloc]
                                     initWithRootViewController: controller];

     self.navigationController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;

     [self presentModalViewController: navigationController 
                             animated: YES]; 

     [controller back];
}

@end