水平滑动即可快速关闭视图控制器

Question

我有一个显示为弹出窗口的视图控制器，我将其呈现在另一个视图控制器中。当我向左/向右滑动以关闭时，我想要这个视图控制器。我该怎么做？

我的视图控制器：

import UIKit

class DelayAlertViewController: UIViewController {
        

    @IBOutlet var contentView: UIView!
    @IBOutlet weak var viewShadow: UIView!
    @IBOutlet weak var delayAlertView: DelayAlertView!
    @IBOutlet weak var infoImage: UIImageView!
    @IBOutlet weak var bannerLabel: UILabel!
    
    private var message: String

    
    init(with message: String) {
        self.message = message
        super.init(nibName: "DelayAlertViewController", bundle: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = .clear
        self.modalPresentationStyle = .overCurrentContext
        self.definesPresentationContext = false
        self.delayAlertView.layer.borderWidth = 0.2
        self.delayAlertView.layer.borderColor = UIColor.black.cgColor
        self.viewShadow.addRoundedCornersShadow(radius: 1, width: 0, height: 0, opacity: 0.2)
        delayAlertView.layer.masksToBounds = false
        delayAlertView.layer.cornerRadius = 5
        delayAlertView.clipsToBounds = true
    }
    
 
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
    }
}

Answer 1

如果我正确理解你的问题，请在 viewDidLoad 中添加以下内容：

override func viewDidLoad() {
    super.viewDidLoad()
    ...
    setupGestureRecognizers()
}

然后：

private func setupGestureRecognizers() {
    let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(self.swipeAction(swipe:)))
    leftSwipe.direction = UISwipeGestureRecognizer.Direction.left
    view.addGestureRecognizer(leftSwipe)
}

最后是目标行动：

@objc func swipeAction(swipe: UISwipeGestureRecognizer) {
    self.dismiss(animated: true)
}

更新： 如果您想要自定义关闭动画，例如向左或向右，请在 swipeAction 中尝试此代码：

@objc func swipeAction(swipe: UISwipeGestureRecognizer) {
   let transition = CATransition()
   transition.duration = 0.5
   transition.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
   transition.type = CATransitionType.push
   transition.subtype = CATransitionSubtype.fromRight
   self.view.window!.layer.add(transition, forKey: nil)
   self.dismiss(animated: false, completion: nil)
}

Answer 2

有两种情况。

场景一：如果您的视图控制器位于 UINavigationController 内部，那么您可以使用苹果内置的 API，称为 InteractivePopGestureRecognizer。只需在 viewDidLoad 中添加以下行：

self.navigationController.interactivePopGestureRecognizer?.isEnabled = true

尽管添加此行后它不起作用，然后添加以下行：

self.navigationController.interactivePopGestureRecognizer?.delegate = nil;

场景二：如果您的视图控制器不在 UINavigationController 内，那么您可以在 viewDidLoad 中添加 UIPanGesture，如下所示：

首先删除名为 myPanGestureRecognizer 的实例，如下所示：

var myPanGestureRecognizer: UIPanGestureRecognizer!

然后在 viewDidLoad 中添加以下行：

myPanGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture(_:)))
            myPanGestureRecognizer.delegate = self
            self.view.addGestureRecognizer(myPanGestureRecognizer)

然后在 viewController 中的任意位置编写以下方法：

@objc func handlePanGesture(_ recognizer: UIPanGestureRecognizer) {
        let velocity = recognizer.velocity(in: view)
        
        if recognizer.state == .ended {
            if velocity.x > 300 { // Adjust the value based on your requirement
                self.dismiss(animated: true, completion: nil)
            }
        }
    }