Xcode UIToolbar Set Height Is Locked
The object in Xcode: UIToolbar is locked when using the Interface Builder at 44 px tall. You can easily change this programmably by using setFrame
However you are able to do this in the Interface Builder as well by creating a constraints for the UIToolbar. Select the toolbar element and choose Editor > Pin > Height. You can now select the constraint and change the height to e.g. 30 px.