Use layout guides for inset instead

Mobile Buy SDK/Mobile Buy SDK/Product View/BUYProductViewController.m

@@ -460,9 +460,11 @@ CGFloat const BUYMaxProductViewHeight = 640.0;
 			[(BUYNavigationController*)self.navigationController updateCloseButtonImageWithTintColor:YES duration:0];
 			self.navigationBar.alpha = 1;
 			self.navigationBarTitle.alpha = 1;
-			// When using 3D Touch, the initial height of the navigation bar (without UIStatusBar) doesn't match the final height (with UIStatusBar)
-			// so we're forced to set it manually in case it's not tall enough. Of course, this is only valid for products with no product images.
-			[self.productView setInsets:UIEdgeInsetsMake(MAX(CGRectGetHeight(self.navigationBar.bounds), 64), 0, 0, 0) appendToCurrentInset:YES];
+			CGFloat topInset = 0;
+			if (self.presentingViewController) {
+				topInset = CGRectGetHeight([[(UINavigationController*)self.presentingViewController navigationBar] bounds]) + self.presentingViewController.topLayoutGuide.length;
+			}
+			[self.productView setInsets:UIEdgeInsetsMake(topInset, 0, 0, 0) appendToCurrentInset:YES];
 		}
 	}
 }