ios – 如何在半屏幕上呈现ViewController

我有一个UIViewController只有一个UIView,从底部覆盖了viewController的1/3.像这样

我想在另一个ViewController上呈现这个viewController.它应该从底部动画出现,它应该忽略到底部动画.

但我不希望它覆盖整个屏幕.显示它的viewController应该在后面可见.

这似乎是一个基本问题但我无法完成它.有人可以指点我的方向吗？

编辑：

这就是我迄今为止所尝试过的.我创建了这些类

// MARK: -

class MyFadeInFadeOutTransitioning: NSObject,UIViewControllerTransitioningDelegate {
var backgroundColorAlpha: CGFloat = 0.5
var shoulDismiss = false

func animationController(forPresented presented: UIViewController,presenting: UIViewController,source: UIViewController) -> UIViewControllerAnimatedTransitioning? {

    let fadeInPresentAnimationController = MyFadeInPresentAnimationController()
        fadeInPresentAnimationController.backgroundColorAlpha = backgroundColorAlpha

    return fadeInPresentAnimationController
}

func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {

    let fadeOutDismissAnimationController = MyFadeOutDismissAnimationController()

    return fadeOutDismissAnimationController
}

}

// MARK: -

class MYFadeInPresentAnimationController: NSObject,UIViewControllerAnimatedTransitioning {

let kPresentationDuration = 0.5
var backgroundColorAlpha: CGFloat?

func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    return kPresentationDuration
}

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)!

    toViewController.view.backgroundColor = UIColor.clear

    let toViewFrame = transitionContext.finalFrame(for: toViewController)
    let containerView = transitionContext.containerView

    if let pickerContainerView = toViewController.view.viewWithTag(kContainerViewTag) {
        let transform = CGAffineTransform(translationX: 0.0,y: pickerContainerView.frame.size.height)
        pickerContainerView.transform = transform
    }

    toViewController.view.frame = toViewFrame
    containerView.addSubview(toViewController.view)

    UIView.animate(withDuration: 0.3,delay: 0.0,options: .curveLinear,animations: {
        toViewController.view.backgroundColor = UIColor(white: 0.0,alpha: self.backgroundColorAlpha!)

        if let pickerContainerView = toViewController.view.viewWithTag(kContainerViewTag) {
            pickerContainerView.transform = CGAffineTransform.identity
        }

    }) { (finished) in
        transitionContext.completeTransition(true)
    }
}

}

// MARK: -

class MYFadeOutDismissAnimationController: NSObject,UIViewControllerAnimatedTransitioning {
let kDismissalDuration = 0.15

func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    return kDismissalDuration
}

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    let fromViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from)!
    let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)!
    let containerView = transitionContext.containerView

    containerView.addSubview(toViewController.view)
    containerView.sendSubview(toBack: toViewController.view)

    UIView.animate(withDuration: kDismissalDuration,animations: {
        //            fromViewController.view.backgroundColor = UIColor.clearColor()
        //            if let pickerContainerView = toViewController.view.viewWithTag(kContainerViewTag) {
        //                let transform = CGAffineTransformMakeTranslation(0.0,pickerContainerView.frame.size.height)
        //                pickerContainerView.transform = transform
        //            }
        fromViewController.view.alpha = 0.0

    }) { (finished) in
        let canceled: Bool = transitionContext.transitionWasCancelled
        transitionContext.completeTransition(true)

        if !canceled {
            UIApplication.shared.keyWindow?.addSubview(toViewController.view)
        }
    }
}

}

在正在呈现的viewController中,我正在做如下

var customTransitioningDelegate: MYFadeInFadeOutTransitioning? = MYFadeInFadeOutTransitioning()

    init() {
    super.init(nibName: "SomeNibName",bundle: Bundle.main)
    transitioningDelegate = customTransitioningDelegate
    modalPresentationStyle = .custom

    customTransitioningDelegate?.backgroundColorAlpha = 0.0
}

它确实呈现了viewController,我也可以看到背景viewController.但我希望它能从底部呈现动画效果.用动画解雇底部.我怎样才能做到这一点？

解决方法

如果你想在半个屏幕上呈现一个视图控制器,我建议使用UIPresentationController类,它允许你在显示时设置视图控制器的框架.一个建议,这个方法将停止presentViewController的用户交互,直到你解雇presentViewController,所以如果你想在屏幕的一半显示视图控制器同时保持用户与presentsViewController的交互,你应该像其他答案一样使用容器视图建议.
这是UIPresentationController类的一个例子,可以执行您想要的操作

import UIKit
class ForgotPasswordPresentationController: UIPresentationController{
    let blurEffectView: UIVisualEffectView!
    var tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer()
    func dismiss(){
        self.presentedViewController.dismiss(animated: true,completion: nil)
    }
    override init(presentedViewController: UIViewController,presenting presentingViewController: UIViewController?) {
        let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.dark)
        blurEffectView = UIVisualEffectView(effect: blurEffect)
        super.init(presentedViewController: presentedViewController,presenting: presentingViewController)
        tapGestureRecognizer = UITapGestureRecognizer(target: self,action: #selector(self.dismiss))
        blurEffectView.autoresizingMask = [.flexibleWidth,.flexibleHeight]
        self.blurEffectView.isUserInteractionEnabled = true
        self.blurEffectView.addGestureRecognizer(tapGestureRecognizer)
    }
    override var frameOfPresentedViewInContainerView: CGRect{
        return CGRect(origin: CGPoint(x: 0,y: self.containerView!.frame.height/2),size: CGSize(width: self.containerView!.frame.width,height: self.containerView!.frame.height/2))
    }
    override func dismissalTransitionWillBegin() {
        self.presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) in
            self.blurEffectView.alpha = 0
        },completion: { (UIViewControllerTransitionCoordinatorContext) in
            self.blurEffectView.removeFromSuperview()
        })
    }
    override func presentationTransitionWillBegin() {
        self.blurEffectView.alpha = 0
        self.containerView?.addSubview(blurEffectView)
        self.presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) in
            self.blurEffectView.alpha = 1
        },completion: { (UIViewControllerTransitionCoordinatorContext) in

        })
    }
    override func containerViewWillLayoutSubviews() {
        super.containerViewWillLayoutSubviews()
        presentedView!.layer.masksToBounds = true
        presentedView!.layer.cornerRadius = 10
    }
    override func containerViewDidLayoutSubviews() {
        super.containerViewDidLayoutSubviews()
        self.presentedView?.frame = frameOfPresentedViewInContainerView
        blurEffectView.frame = containerView!.bounds
    }
}

当您在presentViewController框架外部点击时,这还会添加模糊视图和点按以关闭.您需要设置presentViewController的transitioningDelegate并实现

presentationController(forPresented呈现：UIViewController,呈现：UIViewController？,source：UIViewController) – > UIPresentationController？

在那里的方法.别忘了也设置
modalPresentationStyle = .custom
presentViewController的内容

我发现UIPresentationController的用法是一种更清洁的方法.祝好运

ios – 如何在半屏幕上呈现ViewController

解决方法

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