How can i customize UIAlertAction in UIAlertController for iOS8?

I need to add image in Action sheet item using UIAlertController. I add using:

UIImage *image = [UIImage imageNamed:@"icon.png"];
[alertAction setValue:image forKey:@"image"];

And results as:

The problem is that: I need the image & text to be centrally aligned and resize the height of Cancel button

How can i do that, please share some code.

Thanks!