如何转换/动画UINavigationBar的颜色?

时间:2017-03-25 09:28:04

标签: ios uiview uiviewcontroller

我一直在寻找如何过渡/动画barTintColor UINavigationBar一段时间,我只看到不同的答案。有些使用UIView.animateWithDuration,有些使用CATransition,但最有趣的是this one使用animate(alongsideTransition animation..,我喜欢它的声音,但我无法获得它工作正常。我做错了吗?

许多人指定我可以简单地使用transitionCoordinator中的viewWillAppear:。我已经建立了一个像这样的新超级小项目:

class RootViewController:UIViewController{ //Only subclassed
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        transitionCoordinator?.animate(alongsideTransition: { [weak self](context) in
            self?.setNavigationColors()
            }, completion: nil)
    }
    func setNavigationColors(){
        //Override in subclasses
    }
}

class FirstViewController: RootViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "First"
    }
    override func setNavigationColors(){
        navigationController?.navigationBar.barTintColor = UIColor.white
        navigationController?.navigationBar.tintColor = UIColor.black
        navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.black]
        navigationController?.navigationBar.barStyle = UIBarStyle.default
    }
}
class SecondViewController: RootViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "Second"
    }
    override func setNavigationColors(){
        navigationController?.navigationBar.barTintColor = UIColor.black
        navigationController?.navigationBar.tintColor = UIColor.white
        navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
        navigationController?.navigationBar.barStyle = UIBarStyle.black
    }
}

使用此代码,会发生以下情况: First

  • FirstSecond的推送过渡看起来很完美。所有元素都完美过渡,可能除了StatusBar,它立即变为白色。我宁愿知道如何转换它,但我现在就接受它。
  • SecondFirst的流行转换是完全错误的。它保持Second的颜色,直到转换完成。
  • SecondFirst的拖动过渡看起来没问题,一直拖动。同样,一旦我开始拖动,StatusBar立即变黑,但我不知道是否可以修复。
  • SecondFirst的拖动转换,但取消了拖动中途并返回Second完全搞砸了。它看起来很好,直到Second完全恢复控制,然后它突然变为First - 颜色。这不应该发生。

我对RootViewController进行了一些更改,以使其更好一些。我完全删除了viewWillAppear:,并将其更改为:

class RootViewController:UIViewController{

    override func willMove(toParentViewController parent: UIViewController?) {
        if let last = self.navigationController?.viewControllers.last as? RootViewController{
            if last == self && self.navigationController!.viewControllers.count > 1{
                if let parent = self.navigationController!.viewControllers[self.navigationController!.viewControllers.count - 2] as? RootViewController{
                    parent.setNavigationColors()
                }
            }
        }
    }
    override func viewWillDisappear(_ animated: Bool) {
        if let parent = navigationController?.viewControllers.last as? RootViewController{
            parent.animateNavigationColors()
        }
    }
    override func viewDidAppear(_ animated: Bool) {
        self.setNavigationColors()
    }

    func animateNavigationColors(){
        transitionCoordinator?.animate(alongsideTransition: { [weak self](context) in
            self?.setNavigationColors()
            }, completion: nil)
    }
    func setNavigationColors(){
        //Override in subclasses
    }
}

使用此更新的代码,我得到了这个: Second

一些观察结果:

  • FirstSecond的转换是相同的
  • SecondFirst的弹出式转换现在正确动画,除了后箭头,后退文本(和statusBar,但是是啊......)。这些立即变为黑色。在第一个gif中,您可以看到后箭头和后退文本也已转换。
  • SecondFirst的拖动过渡也存在此问题,启动时后箭头和后退文本突然立即变黑。 barTint是固定的,因此在取消阻力时它不会出现错误的颜色。

我做错了什么?我该怎么做?

我想要的是顺利过渡所有元素。后退按钮,后退文本,标题,barTint和statusBar的色调。这不可能吗?

2 个答案:

答案 0 :(得分:6)

enter image description here

在10个iOS中它运作不完美:(

将导航控制器子类化为使用可见视图控制器的statusbarstyle:

class MyNavigationController: UINavigationController {
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return visibleViewController!.preferredStatusBarStyle
    }
}

覆盖Root控制器中的preferredStatusBarStyle并添加函数以在 pop动画之前设置样式

private var _preferredStyle = UIStatusBarStyle.default;
override var preferredStatusBarStyle: UIStatusBarStyle {
    get {
        return _preferredStyle
    }
    set {
        _preferredStyle = newValue
        self.setNeedsStatusBarAppearanceUpdate()
    }

}


func animateNavigationColors(){
        self.setBeforePopNavigationColors()
        transitionCoordinator?.animate(alongsideTransition: { [weak self](context) in
            self?.setNavigationColors()
            }, completion: nil)
    }

func setBeforePopNavigationColors() {
    //Override in subclasses
}

在第一个控制器中:

override func setBeforePopNavigationColors() {
    navigationController?.navigationBar.tintColor = UIColor.white
    navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
    self.preferredStatusBarStyle = UIStatusBarStyle.lightContent
}

override func setNavigationColors(){
    navigationController?.navigationBar.barTintColor = UIColor.white
    navigationController?.navigationBar.tintColor = UIColor.black
    navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
    navigationController?.navigationBar.barStyle = UIBarStyle.default
    self.preferredStatusBarStyle = UIStatusBarStyle.default
}

第二名:

  override func setNavigationColors(){
        navigationController?.navigationBar.barTintColor = UIColor.black
        navigationController?.navigationBar.tintColor = UIColor.white
        navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
        navigationController?.navigationBar.barStyle = UIBarStyle.black
        self.preferredStatusBarStyle = UIStatusBarStyle.lightContent
    }

示例项目:https://github.com/josshad/TestNavBarTransition

答案 1 :(得分:2)

您可以覆盖UINavigationController的推送和弹出方法来设置条形颜色。我在其导航项中存储了与视图控制器对应的条形颜色,其自定义子类为UINavigationItem。以下代码适用于iOS 11中的完整和交互式转换:

import UIKit

class NavigationItem: UINavigationItem {
    @IBInspectable public var barTintColor: UIColor?
}

class NavigationController: UINavigationController, UIGestureRecognizerDelegate {
    func applyTint(_ navigationItem: UINavigationItem?) {
        if let item = navigationItem as? NavigationItem {
            self.navigationBar.barTintColor = item.barTintColor
        }
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        applyTint(self.topViewController?.navigationItem)
        self.interactivePopGestureRecognizer?.delegate = self
    }
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        applyTint(viewController.navigationItem)
        super.pushViewController(viewController, animated: animated)
    }

    override func popViewController(animated: Bool) -> UIViewController? {
        let viewController = super.popViewController(animated: animated)

        applyTint(self.topViewController?.navigationItem)
        return viewController
    }

    override func popToViewController(_ viewController: UIViewController, animated: Bool) -> [UIViewController]? {
        let result = super.popToViewController(viewController, animated: animated)

        applyTint(viewController.navigationItem)
        return result
    }

    override func popToRootViewController(animated: Bool) -> [UIViewController]? {
        let result = super.popToRootViewController(animated: animated)

        applyTint(self.topViewController?.navigationItem)
        return result
    }

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return (otherGestureRecognizer is UIScreenEdgePanGestureRecognizer)
    }
}

注意:颜色动画的协调由导航控制器

完成