//缩放图片（平铺）
- (UIImage *)resizeImage:(NSString *)imgName
{
UIImage *bgImage = [UIImage imageNamed:imgName];
//缩放图片
bgImage = [bgImage stretchableImageWithLeftCapWidth:bgImage.size.width / 2 topCapHeight:bgImage.size.height / 2];
return bgImage;
}
原文：http://www.cnblogs.com/Xujg/p/5218799.html