swift – 被忽略的preferredStatusBarUpdateAnimation

发布时间：2020-12-14 05:01:56 所属栏目：百科来源：网络整理

导读：我有像这样呈现MainViewController的AuthViewController： let mainVC = MainViewContoller()mainVC.modalTransitionStyle = .CrossDissolveauthVC.presentViewController(mainVC,animated: true,completion: nil) 我希望AuthViewController隐藏状态栏,但要

我有像这样呈现MainViewController的AuthViewController：

let mainVC = MainViewContoller()
mainVC.modalTransitionStyle = .CrossDissolve
authVC.presentViewController(mainVC,animated: true,completion: nil)

我希望AuthViewController隐藏状态栏,但要显示MainViewController,如下所示：

AuthViewController {

    override func preferredStatusBarStyle() -> UIStatusBarStyle {
        return .LightContent
    }

    override func preferredStatusBarUpdateAnimation() -> UIStatusBarAnimation {
        return .Fade
    }

    override func prefersStatusBarHidden() -> Bool {
        return false
    }
}

MainViewController {

    override func preferredStatusBarStyle() -> UIStatusBarStyle {
        return .LightContent
    }

    override func preferredStatusBarUpdateAnimation() -> UIStatusBarAnimation {
        return .Fade
    }

    override func prefersStatusBarHidden() -> Bool {
        return false
    }
}

将显示状态栏,但会忽略preferredStatusBarUpdateAnimation()覆盖.状态栏出现时没有动画.

我只能通过将MainViewController上的prefersStatusBarHidden设置为true来实现动画,直到viewDidAppear,然后调用：

UIView.animateWithDuration(0.3) {
    self.setNeedsStatusBarAppearanceUpdate()
}

我不想每次都打电话.我究竟做错了什么？

解决方法

一直在寻找解决方案.但是,你似乎已经获得了一半的解决方案.你必须为变量设置覆盖,但对我来说最好的做法是为每个覆盖创建一个私有变量对,并让每个覆盖返回它各自的私有变量(见下文).然后,您将更改私有变量并调用setNeedsStatusBarAppearanceUpdate.

另外,您需要在info.plist中将基于View控制器的状态栏外观设置为YES.否则,它仍将依赖于传统的UIApplication.shared …方法.

这是一个片段：

override var preferredStatusBarUpdateAnimation: UIStatusBarAnimation {
    get {
        return .slide
    }
}

private var statusBarStyle : UIStatusBarStyle = .default

override var preferredStatusBarStyle: UIStatusBarStyle {
    get {
        return statusBarStyle
    }
}

private var statusBarStatus : Bool = false

override var prefersStatusBarHidden: Bool {
    get {
        return statusBarStatus
    }
}

然后我可以在这样的函数中调用:(这是我的一个例子,所以忽略自定义函数).

func sliderView(sliderView: SliderView,didSlideToPlace: CGFloat,within: CGFloat) {

    let val = (within - (didSlideToPlace - sliderView.upCent))/(within)
    print(val)
    //Where you would change the private variable for the color,for example.
    if val > 0.5 {
        statusBarStyle = .lightContent
    } else {
        statusBarStyle = .default
    }
    UIView.animate(withDuration: 0.5,animations: {
        sliderView.top.backgroundColor = UIColor.black.withAlphaComponent(val)
        self.coverLayer.alpha = val
        self.scroll.backgroundColor = colors.lightBlueMainColor.withAlphaComponent(val)
    },completion: {
        value in
        //If you do not call setNeedsStatusBarAppearanceUpdate() in an animation block,the animation variable won't be called it seems.
        UIView.animate(withDuration: 0.4,animations: {

            self.animating = true

            //Where you set the status for the bar (your part of the solution)
            self.statusBarStatus = false

            //Then you call for the refresh
            self.setNeedsStatusBarAppearanceUpdate()
        })
    })
}

你最终必须调整每个视图控制器,但它似乎是你想要做的,所以希望它有所帮助！

（编辑：李大同）

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