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Question

我注意到ios 10中条形色调动画的方式发生了变化。我已经创建了一个概述更改的示例项目：Github: ios10BarTintDemo

基本上在ios 9上，barTintColor使用[UIViewControllerTransitionCoordinator animateAlongsideTransition]

平滑动画

但是在ios 10上，动画不太流畅，当弹出一个视图控制器根本没有动画时，我尝试添加[self.navigationController.navigationBar layoutIfNeeded]，如同在一些类似的答案中所提到的那样，但这并不是＆＃ 39;当推/弹控制器时似乎没有任何效果。

Answer 1

更新

我已在iOS 10.3中测试过，我认为问题已得到修复。并且transitionCordinator已经不再需要了。我觉得动画很流畅。请检查我的project on github或查看此代码：

class ViewControllerA: UIViewController {

    override func loadView() {
        super.loadView()
        title = "A"
        view.backgroundColor = .white
        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "NEXT", style: .plain, target: self, action: #selector(self.showController))
    }

    override func viewWillAppear(_ animated: Bool) {
        setColors()
        super.viewWillAppear(animated)
    }

    func showController() {
        navigationController?.pushViewController(ViewControllerB(), animated: true)
    }

    private func setColors() {
        navigationController?.navigationBar.tintColor = .black
        navigationController?.navigationBar.barTintColor = .red
        navigationController?.navigationBar.isTranslucent = false
    }
}




class ViewControllerB: UIViewController {

    override func loadView() {
        super.loadView()
        title = "B"
        view.backgroundColor = .white
    }

    override func viewWillAppear(_ animated: Bool) {
        setColors()
        super.viewWillAppear(animated)
    }

    override func willMove(toParentViewController parent: UIViewController?) {
        if parent == nil {
            navigationController?.navigationBar.barTintColor = .red
        }
        super.willMove(toParentViewController: parent)
    }


    private func setColors() {
        navigationController?.navigationBar.tintColor = .black
        navigationController?.navigationBar.barTintColor = .blue
        navigationController?.navigationBar.isTranslucent = false
    }
}

=============================================== ================================================== ================================================== ================================================== ================================================== ================================================== ===

要实现此类动画，您应使用UIViewControllerTransitionCoordinator作为Apple documentation说明：

采用UIViewControllerTransitionCoordinator协议的对象为与视图控制器转换关联的动画提供支持。（...）

所以每个UIViewController都有自己的transitionController。为此，您应该拨打UIViewControllerClass：

self.transitionCoordinator()

来自documentation：

返回活动的转换协调器对象。

因此，要获得您想要的结果，您应该在viewController transitionCoordinatior中实现animateAlongsideTransition方法。点击backButton并向后滑动即可使用动画。

示例：

第一控制器：

class ViewControllerA: UIViewController {

    override func loadView() {
        super.loadView()
        title = "A"
        view.backgroundColor = .white
        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "NEXT", style: .plain, target: self, action: #selector(self.showController))
        setColors()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        animate()
    }

    func showController() {
        navigationController?.pushViewController(ViewControllerB(), animated: true)
    }

    private func animate() {
        guard let coordinator = self.transitionCoordinator else {
            return
        }

        coordinator.animate(alongsideTransition: {
            [weak self] context in
            self?.setColors()
        }, completion: nil)
    }

    private func setColors() {
        navigationController?.navigationBar.tintColor = .black
        navigationController?.navigationBar.barTintColor = .red
    }
}

第二名管制员：

class ViewControllerB : UIViewController {

    override func loadView() {
        super.loadView()
        title = "B"
        view.backgroundColor = .white
        setColors()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        animate()
    }

    override func willMove(toParentViewController parent: UIViewController?) { // tricky part in iOS 10
        navigationController?.navigationBar.barTintColor = .red //previous color
        super.willMove(toParentViewController: parent)
    }

    override func viewDidAppear(_ animated: Bool) {
        navigationController?.navigationBar.barTintColor = .blue
    }

    private func animate() {
        guard let coordinator = self.transitionCoordinator else {
            return
        }
        coordinator.animate(alongsideTransition: {
            [weak self] context in
            self?.setColors()
        }, completion: nil)
    }

    private func setColors(){
        navigationController?.navigationBar.tintColor = .black
        navigationController?.navigationBar.barTintColor = .blue
    }

}

更新iOS 10

在iOS 10中，棘手的部分是在 second ViewController中添加willMoveTo(parentViewController parent: UIViewController?)。并将navigationBar tintColor设置为 上一个 控制器的颜色值。此外，在第二中的viewDidAppear方法中，ViewControler将navigationBar.tintColor设置为 second 的颜色strong> viewController。

查看我的示例project on github

Answer 2

您可以通过添加与此类似的内容来修复此弹出式问题，在viewWillDisappear中运行它在iOS10中因某种原因而无法正常工作

override func willMove(toParentViewController parent: UIViewController?) {
    self.navigationController?.navigationBar.barTintColor = UIColor.red
    super.willMove(toParentViewController: parent)
}

iOS 10 barTintColor动画

2 个答案:

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