I have an issue while displying the BannerView on my screen like below image:

Even i’m setting bannerFrame.size.width = 300; , but notgetting.
So i need to reduce the size of bannerView by 10+10= 20 pixels to avoid overlapping the bannerView on my background imageview.
Please help me out.
Documentation says:
Update
Please refer this document for BannerView
To create and give size to ADBannerView: