如何将bar导航栏的位置更改为顶部

Question

I need to change barPosition of navController's navBar to topAttached type. I try to use position(for bar:) method of UINavigationBarDelegate. In MyViewController class:

navigationController?.navigationBar.delegate = self

and in extension:

extension MyViewController: UINavigationBarDelegate{
    func position(for bar: UIBarPositioning) -> UIBarPosition {
        return .topAttached
    }
}

But it's not working, because of

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Cannot manually set the delegate on a UINavigationBar managed by a controller.'

So is here any else way to change barPosition in swift 3? Thanks in advance!

Answer 1

NavigationBar.position is a readonly property. You can't change it. If you want to change the frames of Navigationbar. Firstly change the frames of UINavigationController and then bar in it.

Example:

If you want to shift it downwards:

    self.navigationController?.view.frame = CGRect(x: 0.0, y: 100.0, width: 320.0, height: 426.0)
    self.navigationController?.navigationBar.frame = CGRect(x: 0.0, y: 0.0, width: 320.0, height: 44.0)