影响滑动删除行的 TableView 手势识别器

Posted 2023-03-12

【中文标题】影响滑动删除行的 TableView 手势识别器

【英文标题】：TableView Gesture Recognizer Effecting Swipe Delete Row

【发布时间】：2017-08-13 00:27:22

【问题描述】：

我的视图控制器中有一个手势识别器，当您上下滑动时，它会上下推动视图控制器。这个手势识别器与我向左滑动表格视图单元格以显示删除按钮的能力相冲突。

这是我当前的代码：

导入 UIKit

class CategoriesViewController: UIViewController, UITableViewDelegate, UITableViewDataSource 

let categories = "categories"

var settings: UITableView = UITableView()
var parentVC : MapBoxViewController!

var fullView: CGFloat 
    return 65

var partialView: CGFloat 
    return UIScreen.main.bounds.height - 65


var halfView: CGFloat 
    return (UIScreen.main.bounds.height/2) - 5


override func viewDidLoad() 
    super.viewDidLoad()
    self.view.backgroundColor = UIColor.white
    let gesture = UIPanGestureRecognizer.init(target: self, action: #selector(CategoriesViewController.panGesture))
    gesture.delegate = self
    view.addGestureRecognizer(gesture)
    roundViews()
    view.addSubview(settings)

    self.automaticallyAdjustsScrollViewInsets = false
    settings.frame = CGRect(x: 0, y: 65, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height-65)
    settings.delegate = self
    settings.dataSource = self
    settings.separatorColor = UIColor.clear
    settings.register(CategoriesCell.self, forCellReuseIdentifier: "categories")



func roundViews() 
    view.layer.cornerRadius = 18
    view.clipsToBounds = true


override func didReceiveMemoryWarning() 
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.


func panGesture(recognizer: UIPanGestureRecognizer) 
    let translation = recognizer.translation(in: self.view)
    let velocity = recognizer.velocity(in: self.view)
    let y = self.view.frame.minY
    if ( y + translation.y >= fullView) && (y + translation.y <= partialView ) 
        self.view.frame = CGRect(x: 0, y: y + translation.y, width: view.frame.width, height: view.frame.height)
        recognizer.setTranslation(CGPoint.zero, in: self.view)
    

    if recognizer.state == .ended 
        var duration =  velocity.y < 0 ? Double((y - fullView) / -velocity.y) : Double((partialView - y) / velocity.y )

        duration = duration > 1.3 ? 1 : duration

        UIView.animate(withDuration: duration, delay: 0.0, usingSpringWithDamping: 0.7, initialSpringVelocity: 0.4, options: [.allowUserInteraction], animations: 
            if  velocity.y >= 0 
                if y > self.halfView 
                    self.view.frame = CGRect(x: 0, y: self.partialView, width: self.view.frame.width, height: self.view.frame.height)
                 else 
                    self.view.frame = CGRect(x: 0, y: self.halfView, width: self.view.frame.width, height: self.view.frame.height)
                
             else 
                if y > self.halfView 
                    self.view.frame = CGRect(x: 0, y: self.halfView, width: self.view.frame.width, height: self.view.frame.height)
                 else 
                    self.view.frame = CGRect(x: 0, y: self.fullView, width: self.view.frame.width, height: self.view.frame.height)
                
            
        , completion: nil)
    


override func viewDidAppear(_ animated: Bool) 
    super.viewDidAppear(animated)
    UIView.animate(withDuration: 0.6, delay: 0.0, usingSpringWithDamping: 0.6, initialSpringVelocity: 0.2, options: [.allowUserInteraction], animations: 
        let frame = self.view.frame
        self.view.frame = CGRect(x: 0, y: self.halfView, width: frame.width, height: frame.height)
    , completion: nil)


func numberOfSections(in tableView: UITableView) -> Int 
    return 1


func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    return 5


func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat 
    return 55


func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
    tableView.deselectRow(at: indexPath, animated: true)



func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
    if indexPath.row == 0 
        let cell = tableView.dequeueReusableCell(withIdentifier: categories) as! CategoriesCell
        return cell
     else if indexPath.row == 1 
        let cell = tableView.dequeueReusableCell(withIdentifier: categories) as! CategoriesCell
        cell.tripCategoryView.backgroundColor = UIColor(r: 91, g: 192, b: 235)
        cell.tripCategory.text = "Activities"
        return cell
     else if indexPath.row == 2 
        let cell = tableView.dequeueReusableCell(withIdentifier: categories) as! CategoriesCell
        cell.tripCategoryView.backgroundColor = UIColor(r: 21, g: 176, b: 151)
        cell.tripCategory.text = "Cultural"
        return cell
     else if indexPath.row == 3 
        let cell = tableView.dequeueReusableCell(withIdentifier: categories) as! CategoriesCell
        cell.tripCategoryView.backgroundColor = UIColor(r: 66, g: 230, b: 255)
        cell.tripCategory.text = "Night Life"
        return cell
     else if indexPath.row == 4 
        let cell = tableView.dequeueReusableCell(withIdentifier: categories) as! CategoriesCellvv
        cell.tripCategoryView.backgroundColor =  UIColor(r: 183, g: 157, b: 237)
        cell.tripCategory.text = "Bars"
        return cell
     else 
        let cell = tableView.dequeueReusableCell(withIdentifier: categories) as! AllTripCategoriesCell
        return cell
    



extension TripCategoriesViewController: UIGestureRecognizerDelegate 

// Solution
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool 
    let gesture = (gestureRecognizer as! UIPanGestureRecognizer)
    let direction = gesture.velocity(in: view).y

    let y = view.frame.minY
    if (y == fullView && settings.contentOffset.y == 0 && direction > 0) || (y == partialView) 
        settings.isScrollEnabled = false
     else 
        settings.isScrollEnabled = true
    

    return false

如果您能对此提供帮助，我们将不胜感激。我想我可能需要在我的自定义单元格类中添加一个手势识别器

【参考方案1】：

您可以在进行任何操作之前检测手势方向。可以通过使用 UIGestureRecognizerDelegate 手势RecognizerShouldBegin 方法来实现：

override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool 

    //detecting a direction
    if let recognizer = gestureRecognizer as? UIPanGestureRecognizer 
        let velocity = recognizer.velocity(in: self)

        if fabs(velocity.y) > fabs(velocity.x) 
            // this is swipe up/down so you can handle that gesture
            return true
         else 
            //this is swipe left/right
            //do nothing for that gesture
            return false
        
    
    return true

或者你可以随心所欲地改变它。 希望它会有所帮助。