CODEWITHSUNDEEP
iosswiftuinavigationcontrolleruikitnavigationbar
Herakleis
Herakleis

Reputation: 533

Remove custom subview in navigation bar added from controller

I am adding a custom subview into the navigation bar from a view controller like so (width is derived at layout from the button's contentMode = .scaleAspectFit):

// navigationBar is just sugar for navigationController.navigationBar
navigationBar?.addSubview(button)
button.centerYAnchor.constraint(equalTo: navigationBar!.centerYAnchor).isActive = true
button.leftAnchor.constraint(equalTo: navigationBar!.leftAnchor, constant: navigationBar!.bounds.size.width / 18).isActive = true
button.heightAnchor.constraint(equalTo: navigationBar!.heightAnchor, multiplier: 0.5).isActive = true

In my viewDidDisappear I attempted to do a button.removeFromSuperview() but ended up with a crash:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Cannot modify constraints for UINavigationBar managed by a controller'

which I have trouble to understand. I have tried tagging the button and removing it from a UINavigationControllerDelegate without success.

Is there something I am doing fundamentally wrong?

Thanks in advance.

Upvotes: 1

Views: 2287

Answers (2)

Ahrorbek Abdullayev
Ahrorbek Abdullayev

Reputation: 81

At my case removing constraints worked like a charm. Note: I used from snapKit. And before removing navigationBar's subview I removed all constraints from this subview.

for instance:

someSubview.snp.removeConstraints()
someSubview.removeFromSuperview()

That is all.

Upvotes: 4

Manikanta Chintapalli
Manikanta Chintapalli

Reputation: 333

First make all constraints inactive and remove from superview,

override func viewDidDisappear(_ animated: Bool) {
    button.constraints.forEach { $0.isActive = false }
    button.removeFromSuperview()
}

Upvotes: 4

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