Question

我试图在其他viewController上呈现模态视图控制器，其大小为半父视图控制器。但它始终以全屏视图显示。

我在故事板中创建了具有固定帧大小的自由形式大小的View控制器。 320 X 250。

var storyboard = UIStoryboard(name: "Main", bundle: nil)
var pvc = storyboard.instantiateViewControllerWithIdentifier("CustomTableViewController") as ProductsTableViewController
self.presentViewController(pvc, animated: true, completion: nil)

我试图设置frame.superview但它没有帮助。

Picture example

请建议。

Answer 1

您可以使用UIPresentationController来实现此目标。

为此，您让展示ViewController实施UIViewControllerTransitioningDelegate并返回您的PresentationController以进行半尺寸演示：

func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController!, sourceViewController source: UIViewController) -> UIPresentationController? {
    return HalfSizePresentationController(presentedViewController: presented, presentingViewController: presenting)
}

在演示时，您将演示文稿样式设置为.Custom并设置转换代理：

pvc.modalPresentationStyle = UIModalPresentationStyle.Custom
pvc.transitioningDelegate = self

演示控制器仅返回您呈现的视图控制器的帧：

class HalfSizePresentationController : UIPresentationController {
    override func frameOfPresentedViewInContainerView() -> CGRect {
        return CGRect(x: 0, y: 0, width: containerView.bounds.width, height: containerView.bounds.height/2)
    }
}

以下是完整的工作代码：

class ViewController: UIViewController, UIViewControllerTransitioningDelegate {

    @IBAction func tap(sender: AnyObject) {
        var storyboard = UIStoryboard(name: "Main", bundle: nil)
        var pvc = storyboard.instantiateViewControllerWithIdentifier("CustomTableViewController") as UITableViewController

        pvc.modalPresentationStyle = UIModalPresentationStyle.Custom
        pvc.transitioningDelegate = self
        pvc.view.backgroundColor = UIColor.redColor()

        self.presentViewController(pvc, animated: true, completion: nil)
    }

    func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController!, sourceViewController source: UIViewController) -> UIPresentationController? {
        return HalfSizePresentationController(presentedViewController: presented, presentingViewController: presentingViewController)
    }
}

class HalfSizePresentationController : UIPresentationController {
    override func frameOfPresentedViewInContainerView() -> CGRect {
        return CGRect(x: 0, y: 0, width: containerView.bounds.width, height: containerView.bounds.height/2)
    }
}

Answer 2

如果你在ViewController中推送一些希望半模式出现的null委托方法，那将是一个干净的架构师。

假设UIViewControllerTransitioningDelegate ViewControllerA存在ViewControllerB半模态。

<{1>}中的

仅使用自定义modalPresentationStyle存在ViewControllerA

ViewControllerB

在ViewControllerB中：

func gotoVCB(_ sender: UIButton) {
    let vc = ViewControllerB()
    vc.modalPresentationStyle = .custom
    present(vc, animated: true, completion: nil)
}

结果：

所有代码都发布在我的Github

Answer 3

以防万一有人希望像我一样使用Swift 4。

class MyViewController : UIViewController {
    ...
    @IBAction func dictionaryButtonTouchUp(_ sender: UIButton) {
        let modalViewController = ...
        modalViewController.transitioningDelegate = self
        modalViewController.modalPresentationStyle = .custom

        self.present(modalViewController, animated: true, completion: nil)
    }
}

extension MyViewController : UIViewControllerTransitioningDelegate {
    func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
        return HalfSizePresentationController(presentedViewController: presented, presenting: presenting)
    }
}

HalfSizePresentationController类由以下组成：

class HalfSizePresentationController : UIPresentationController {
    override var frameOfPresentedViewInContainerView: CGRect {
        get {
            guard let theView = containerView else {
                return CGRect.zero
            }

            return CGRect(x: 0, y: theView.bounds.height/2, width: theView.bounds.width, height: theView.bounds.height/2)
        }
    }
}

干杯！

Answer 4

Jannis很好地抓住了整体战略。它在iOS 9.x中使用swift 3并不适用于我。在演示VC时，启动所呈现VC的操作类似于上面提到的一些非常小的更改，如下所示：

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let pvc = storyboard.instantiateViewController(withIdentifier: "SomeScreen") as SomeViewController

pvc.modalPresentationStyle = .custom
pvc.transitioningDelegate = self

present(pvc, animated: true, completion: nil)

要在同一个演示VC上实现UIViewControllerTransitioningDelegate，语法会有所不同，如https://stackoverflow.com/a/39513247/2886158中的SO答案所示。这对我来说是最棘手的部分。这是协议实现：

func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
    return HalfSizePresentationController(presentedViewController:presented, presenting: presenting)
}

对于UIPresentationController类，我必须覆盖变量frameOfPresentedViewInContainerView，而不是方法，如下所示：

class HalfSizePresentationController: UIPresentationController {
    override var frameOfPresentedViewInContainerView: CGRect {
        return CGRect(x: 0, y: 0, width: containerView!.bounds.width, height: containerView!.bounds.height/2)
    }
}

有一些关于如何在演示后解雇视图的问题。您可以像任何其他VC一样在您呈现的VC上实现所有常用逻辑。当用户在显示的VC之外选中时，我实现了一个动作来解除SomeViewController中的视图。

Answer 5

添加到Jannis＆＃39;回答：

如果您的pop视图是在加载/设置时添加表的UIViewController，则需要确保您创建的表格框架与实际视图的所需宽度匹配。

例如：

let tableFrame: CGRect = CGRectMake(0, 0, chosenWidth, CGFloat(numOfRows) * rowHeight)

其中 chosenWidth 是您在自定义类中设置的宽度（在上面： containerView.bounds.width ）

您不需要对Cell本身强制执行任何操作，因为表容器（至少在理论上）应该强制单元格的宽度。

Answer 6

我使用下面的逻辑来呈现半屏ViewController

 let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let expVC = storyboard.instantiateViewController(withIdentifier: "AddExperinceVC") as! AddExperinceVC
    expVC.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext

    self.present(expVC, animated: true, completion: nil)

Answer 7

这是 Swift 4.0 ，某些类名称已更改frameOfPresentedViewInContainerView get方法

第1步：设置代表

class ViewController: UIViewController, UIViewControllerTransitioningDelegate

第2步：设置代表方法

func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
         return SetSizePresentationController(presentedViewController: presented, presenting: presenting)
}

第3步：在这里，您可以为设置的大小（CGRect）创建自己的类

class SetSizePresentationController : UIPresentationController {
    override var frameOfPresentedViewInContainerView: CGRect {
        get {
             return CGRect(x: 0, y: (containerView?.bounds.height ?? 0)/2, width: containerView?.bounds.width ?? 0, height: (containerView?.bounds.height ?? 0)/2)
        }
    }
}

第4步：此处有两行重要的transitioningdelegate和UIModalPresentationStyle.custom

let storyboard = UIStoryboard(name: "User", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "LicenceViewController") as! LicenceViewController
vc.modalPresentationStyle = UIModalPresentationStyle.custom
vc.transitioningDelegate = self
present(vc, animated: true)

Answer 8

详细信息

Xcode 12.2（12B45b）
Swift 5.3

解决方案1.默认转换

想法：

隐藏root view中的ChildViewController，然后添加将用作root view的新视图。

主要逻辑：

class ChildViewController: UIViewController { 
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .clear

        let contentView = UIView()
        contentView.backgroundColor = .lightGray
        view.addSubview(contentView)
        //...
    }
}

解决方案1.完整样品

import UIKit

// MARK: ParentViewController

class ParentViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let button = UIButton(frame: CGRect(x: 50, y: 50, width: 200, height: 60))
        button.setTitle("Present VC", for: .normal)
        button.setTitleColor(.blue, for: .normal)
        button.addTarget(self, action: #selector(touchedUpInside), for: .touchUpInside)
        view.addSubview(button)
    }

    @objc func touchedUpInside(source: UIButton) {
        let viewController = ChildViewController()
        present(viewController, animated: true, completion: nil)
    }
}

// MARK: ChildViewController

class ChildViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .clear

        let contentView = UIView()
        contentView.backgroundColor = .lightGray
        view.addSubview(contentView)

        contentView.translatesAutoresizingMaskIntoConstraints = false
        contentView.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.5).isActive = true
        contentView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor).isActive = true
        contentView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor).isActive = true
        contentView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
    }
}

解决方案2。自定义过渡

想法：

更改ChildViewController的根视图的大小。

主要逻辑：

ModalPresentationController

protocol ModalPresentationControllerDelegate: class {
    func updateFrameOfPresentedViewInContainerView(frame: CGRect) -> CGRect
}

class ModalPresentationController: UIPresentationController {
    private weak var modalPresentationDelegate: ModalPresentationControllerDelegate!

    convenience
    init(delegate: ModalPresentationControllerDelegate,
         presentedViewController: UIViewController,
         presenting presentingViewController: UIViewController?) {
        self.init(presentedViewController: presentedViewController,
                  presenting: presentingViewController)
        self.modalPresentationDelegate = delegate
    }

    override var frameOfPresentedViewInContainerView: CGRect {
        get { modalPresentationDelegate.updateFrameOfPresentedViewInContainerView(frame: super.frameOfPresentedViewInContainerView) }
    }
}

更新根视图大小

class ChildViewController: UIViewController {
    init() {
        //...
        transitioningDelegate = self
        modalPresentationStyle = .custom
    }
}

extension ChildViewController: UIViewControllerTransitioningDelegate {
    func presentationController(forPresented presented: UIViewController,
                                presenting: UIViewController?,
                                source: UIViewController) -> UIPresentationController? {
        ModalPresentationController(delegate: self, presentedViewController: presented, presenting: presenting)
    }
}

extension ChildViewController: ModalPresentationControllerDelegate {
    func updateFrameOfPresentedViewInContainerView(frame: CGRect) -> CGRect {
        CGRect(x: 0, y: frame.height/2, width: frame.width, height: frame.height/2)
    }
}

解决方案2。完整样本

不要忘记在此处粘贴上面定义的ModalPresentationController

import UIKit

// MARK: ParentViewController

class ParentViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let button = UIButton(frame: CGRect(x: 50, y: 50, width: 200, height: 60))
        button.setTitle("Present VC", for: .normal)
        button.setTitleColor(.blue, for: .normal)
        button.addTarget(self, action: #selector(touchedUpInside), for: .touchUpInside)
        view.addSubview(button)
    }

    @objc func touchedUpInside(source: UIButton) {
        let viewController = ChildViewController()
        present(viewController, animated: true, completion: nil)
    }
}

// MARK: ChildViewController

class ChildViewController: UIViewController {
    init() {
        super.init(nibName: nil, bundle: nil)
        transitioningDelegate = self
        modalPresentationStyle = .custom
        view.backgroundColor = .lightGray
    }

    required init?(coder: NSCoder) { super.init(coder: coder) }
}

extension ChildViewController: UIViewControllerTransitioningDelegate {
    func presentationController(forPresented presented: UIViewController,
                                presenting: UIViewController?,
                                source: UIViewController) -> UIPresentationController? {
        ModalPresentationController(delegate: self, presentedViewController: presented, presenting: presenting)
    }
}

extension ChildViewController: ModalPresentationControllerDelegate {
    func updateFrameOfPresentedViewInContainerView(frame: CGRect) -> CGRect {
        CGRect(x: 0, y: frame.height/2, width: frame.width, height: frame.height/2)
    }
}

Answer 9

正常呈现，然后在systemLayoutSizeFitting中使用viewDidLayoutSubviews将框架调整到所需的最小尺寸。这保留了 Apple 提供的视觉效果和物理效果——如果使用自定义演示文稿，您将失去这些效果。

请参阅 this answer 上的示例代码。

在半尺寸父控制器中呈现模态视图控制器

9 个答案:

详细信息

解决方案1.默认转换

解决方案1.完整样品

解决方案2。自定义过渡

解决方案2。完整样本