objective-c : presentView and dismissView method with block

snippet.m

//presentView and dismissView method with block

NSLog(@"Presenting view");

[self presentViewController:changeLocationViewController animated:YES completion:^{
    NSLog(@"View done presenting");
}];

NSLog(@"Dismissing view");

[self dismissViewControllerAnimated:NO completion:^{
    NSLog(@"View done dismissing");
}];

//ex

- (IBAction)doneButtonPressed:(id)sender {
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    [self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"Dismissing View");
        NSLog(@"View done dismissing");
    }];
}