How to adjust UIToolBar left and right padding

Question

I create one UIToolbar with code and another with interface builder. But, found out the two toolbar having different left and right padding which shown below:

From I

Answer 1

This is a great question and even with the solutions provided - it did not resolve the problem on iOS11.

WORKING SOLUTION

If you create a new extension of UIButton:

class BarButton: UIButton {

    override var alignmentRectInsets: UIEdgeInsets {
        return UIEdgeInsetsMake(0, 16, 0, 16)
    }

}

Then when you use it in your layout:

lazy var btnLogin: BarButton = {
    let btn = BarButton(type: .custom)
    // Add your button settings

    btn.widthAnchor.constraint(equalToConstant: self.frame.size.width).isActive = true
    btn.heightAnchor.constraint(equalToConstant: 50).isActive = true
    btn.translatesAutoresizingMaskIntoConstraints = false
    return btn
}()

This solved a very annoying problem, if you have any issues give me a shout.