无论设备如何，我应该做些什么来确保工具栏位于底部？

I have created a view (MyOverlayView.xib) and add a toolbar to the bottom of the view and set the constraints to (left: 0, bottom, 0: right: 0) and I now add this to a UIImagePickerController, in my view controller, as such:I have created a view (MyOverlayView.xib) and a