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func delay(delay:Double, closure:()->()) {
    dispatch_after(
        dispatch_time(
            DISPATCH_TIME_NOW,
            Int64(delay * Double(NSEC_PER_SEC))
        ),
        dispatch_get_main_queue(), closure)
}

Zhukn1

- (void)perform {
    UIViewController *sourceController      = self.sourceViewController;
    UIViewController *destinationController = self.destinationViewController;
    
    UIView *destView    = destinationController.view;
    destView.alpha      = 0;
    
    [sourceController.view addSubview:destView];
    destView.frame      = CGRectMake(0, 0,
                                     CGRectGetWidth(sourceController.view.bounds),

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    //initial string
    NSString *str = @"the quick brown fox jumped over the fence";
    
    //convert string to array of characters
    NSMutableArray *stringArray = [NSMutableArray array];
    [str enumerateSubstringsInRange:NSMakeRange(0, str.length)
                            options:NSStringEnumerationByComposedCharacterSequences
                         usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
                             [stringArray addObject:[substring lowercaseString]];
    }];

Zhukn1

AA,
AB,
AC,
AD,
AE,
AF,
AG,
AH,
AI,
AJ,