How to create a transparent modal View Controller

transparentModalViewController.m

#pragma mark - Transparent Modal View
-(void) presentTransparentModalViewController: (UIViewController *) aViewController 
                                     animated: (BOOL) isAnimated 
                                    withAlpha: (CGFloat) anAlpha{
    
    self.transparentModalViewController = aViewController;
    UIView *view = aViewController.view;
    
    view.opaque = NO;
    view.alpha = anAlpha;
    [view.subviews enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        UIView *each = obj;
        each.opaque = NO;
        each.alpha = anAlpha;
    }];
    
    if (isAnimated) {
        //Animated
        CGRect mainrect = [[UIScreen mainScreen] bounds];
        CGRect newRect = CGRectMake(0, mainrect.size.height, mainrect.size.width, mainrect.size.height);
        
        
        [self.view addSubview:view];
        view.frame = newRect;
        
        [UIView animateWithDuration:0.8
                         animations:^{
                             view.frame = mainrect;
                         } completion:^(BOOL finished) {
                             //nop
                         }];
        
    }else{
        view.frame = [[UIScreen mainScreen] bounds];
        [self.view addSubview:view];
    }
    
    
    
    
    
    
}

-(void) dismissTransparentModalViewControllerAnimated:(BOOL) animated{
    
    if (animated) {
        CGRect mainrect = [[UIScreen mainScreen] bounds];
        CGRect newRect = CGRectMake(0, mainrect.size.height, mainrect.size.width, mainrect.size.height);
        [UIView animateWithDuration:0.8
                         animations:^{
                             self.transparentModalViewController.view.frame = newRect;
                         } completion:^(BOOL finished) {
                             [self.transparentModalViewController.view removeFromSuperview];
                             self.transparentModalViewController = nil;
                         }];
    }
  
    
}