Specifies how banner should be layed out on screen.
Please note that Traditional Banner and Rect Banner (introduced in ios6) use different enum values. If you use "wrong" enum value for current ad type: for Traditional Banner Top* and Center* will be considered Top, and Bottom* will be considered Bottom* for Rect Banner Top will be considered TopLeft and Bottom - BottomLeft.
| Top | Traditional Banner: align to screen top. |
| Bottom | Traditional Banner: align to screen bottom. |
| TopLeft | Rect Banner: place in top-left corner. |
| TopRight | Rect Banner: place in top-right corner. |
| TopCenter | Rect Banner: align to screen top, placing at the center. |
| BottomLeft | Rect Banner: place in bottom-left corner. |
| BottomRight | Rect Banner: place in bottom-right corner. |
| BottomCenter | Rect Banner: align to screen bottom, placing at the center. |
| CenterLeft | Rect Banner: align to screen left, placing at the center. |
| CenterRight | Rect Banner: align to screen right, placing at the center. |
| Center | Rect Banner: place exactly at screen center. |
| Manual | Completely manual positioning. |