UIView甚至在从superview中删除后重新出现

Question

I have a problem where if I remove subview from super view and then when I push to another VC and come back all the removed subview reappear in the view I have tried everything and checked my code if viewDidApper too.

//HERE IS HOW I ADD VIEWS

func addusers() {

    for user in 0...5 {
        let radarButton = PRButton(frame: CGRect(x: 0, y: 0, width: itemSize.width, height: itemSize.height+14))
        radarButton.profileButton?.setImage(UIImage(named: "dummy-avatar.png"), for: UIControlState())
        radarButton.profileName.setTitle("test \(user)", for: .normal)

        repeat {
            let center = generateCenterPointInRadar()
            radarButton.center = CGPoint(x: center.x, y: center.y)

        } while (itemFrameIntersectsInOtherItem(radarButton.frame))
        radarButton.profileButton?.addTarget(self, action: #selector(didTapUser), for: .touchUpInside)
        radarButton.profileName?.addTarget(self, action: #selector(didTapUser), for: .touchUpInside)
        self.addSubview(radarButton)
        items.append(radarButton)
    }

}

//HERE IS HOW I REMOVE VIEWS
func removeAllUsers() {
    for view in self.subviews {
        if view is PRButton  {
            view.removeFromSuperview()
        }
    }
    items.removeAll()

}
//Remove from superview
    override func removeFromSuperview() {

        UIView.beginAnimations("", context: nil)
        UIView.setAnimationDuration(1)
        self.alpha = 0
        UIView.setAnimationDidStop(Selector(("callSuperRemoveFromSuperview")))
        UIView.commitAnimations()

    }

fileprivate func callSuperRemoveFromSuperview() {
    super.removeFromSuperview()
}

Thanks in advance

Answer 1

I looked at the test project. I think I found the problem, it was at the override func removeFromSuperview() I comment out it and edit the removeAllUsers()

func removeAllUsers() {
    for view in self.subviews {
        if view is PRButton  {
          UIView.animate(withDuration: 1, animations: { 
            view.alpha = 0
          }, completion: { (finished) in
            view.removeFromSuperview()
          })
        }
    }
    items.removeAll()

}

Now I don't see any duplicate users while I'm back to the viewController

Answer 2

First thing to look at...

In PRButton you override removeFromSuperview() -- but your structure is incorrect and you never actually remove the view.

Replace it with this:

override func removeFromSuperview() {

    UIView.animate(withDuration: 1.0, animations: ({
        self.alpha = 0.0
    }), completion: { _ in
        self.callSuperRemoveFromSuperview()
    })

}

You could also simply call super.removeFromSuperview() instead of your additional self.callSuperRemoveFromSuperview() function.

Get to know the Debug View Hierarchy feature... you would have seen that immediately.