如何在 Swift 中长按时选择表格行答案

【问题标题】：How To select a table row during a long press in Swift如何在 Swift 中长按时选择表格行
【发布时间】：2015-06-15 07:13:04
【问题描述】：

我有一个表格，它有一个长按手势识别器，它根据选择的表格行运行代码。

我遇到的麻烦是我目前必须点击我想要的行然后长按。

如何让表格选择我长按的行，而无需先点击选择它？

【问题讨论】：

标签： ios swift uigesturerecognizer

【解决方案1】：

Swift 4 和 5

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

func setupLongPressGesture() {
    let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(self.handleLongPress))
    longPressGesture.minimumPressDuration = 1.0 // 1 second press
    longPressGesture.delegate = self
    self.tblMessage.addGestureRecognizer(longPressGesture)
}

@objc func handleLongPress(_ gestureRecognizer: UILongPressGestureRecognizer){
    if gestureRecognizer.state == .began {
        let touchPoint = gestureRecognizer.location(in: self.tblMessage)
        if let indexPath = tblMessage.indexPathForRow(at: touchPoint) {
            
        }
    }
}

斯威夫特 3

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

func setupLongPressGesture() {
    let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(YourViewController.handleLongPress(_:)))
    longPressGesture.minimumPressDuration = 1.0 // 1 second press
    longPressGesture.delegate = self
    self.tblMessage.addGestureRecognizer(longPressGesture)
}

func handleLongPress(_ longPressGestureRecognizer: UILongPressGestureRecognizer) {
    
    if longPressGestureRecognizer.state == UIGestureRecognizerState.Began {
        
        let touchPoint = longPressGestureRecognizer.locationInView(self.view)
        if let indexPath = tableView.indexPathForRowAtPoint(touchPoint) {
            
            // your code here, get the row for the indexPath or do whatever you want
        }
    }
}

目标 - C

UILongPressGestureRecognizer* longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(onLongPress:)];
[self.tableView addGestureRecognizer:longPressRecognizer];

-(void)onLongPress:(UILongPressGestureRecognizer*)pGesture
{
    if (pGesture.state == UIGestureRecognizerStateRecognized)
    {
    //Do something to tell the user!
    }

    if (pGesture.state == UIGestureRecognizerStateEnded)
    {
        UITableView* tableView = (UITableView*)self.view;
        CGPoint touchPoint = [pGesture locationInView:self.view];
        NSIndexPath* row = [tableView indexPathForRowAtPoint:touchPoint];
        if (row != nil) {
        //Handle the long press on row
        }
    }
}

【讨论】：

在 5 秒内为我工作。 Swift 4 谢谢好友！！
需要修复 Swift 4 的示例。需要删除行 'longPressGesture.delegate = self' 和 .end 替换 .began
我同意@DronPop。我确认 Swift4 不需要“longPressGesture.delegate = self”。另外我也觉得'.began'比较合适。无论如何，这是一个很好的答案，所以我投了赞成票。
我不知道为什么，但我得到 indexPathForRowAtPoint 值为零

【解决方案2】：

以下代码对我来说很好用：

在 viewDidLoad 中添加长按手势识别器：

// tapRecognizer, placed in viewDidLoad
let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: "longPress:")
self.view.addGestureRecognizer(longPressRecognizer)

那么长按调用的方法是这样的：

//Called, when long press occurred
func longPress(longPressGestureRecognizer: UILongPressGestureRecognizer) {

    if longPressGestureRecognizer.state == UIGestureRecognizerState.Began {

        let touchPoint = longPressGestureRecognizer.locationInView(self.view)
        if let indexPath = tableView.indexPathForRowAtPoint(touchPoint) {

            // your code here, get the row for the indexPath or do whatever you want
    }
}

【讨论】：

他已经实现了功能并面临额外的点击问题。
我不确定我是否正确理解了这个问题。我至少可以说的是，我用我的代码长按，我得到了我长按所在行的 indexPath。无需额外点击。
let touchPoint = longPressGestureRecognizer.locationInView(self.tableView) 是正确的，而不是 let touchPoint = longPressGestureRecognizer.locationInView(self.view)。否则，您不会考虑到self.tableView.frame.origin 不能等于CGPointZero

【解决方案3】：

Swift 3 功能：

func handleLongPress(_ longPressGestureRecognizer: UILongPressGestureRecognizer) {

    if longPressGestureRecognizer.state == UIGestureRecognizerState.Began {

        let touchPoint = longPressGestureRecognizer.locationInView(self.view)
        if let indexPath = tableView.indexPathForRowAtPoint(touchPoint) {

            // your code here, get the row for the indexPath or do whatever you want
    }
}

viewDidLoad：

let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(YourViewController.handleLongPress(_:)))
longPressGesture.minimumPressDuration = 1.0 // 1 second press
longPressGesture.delegate = self
self.tableView.addGestureRecognizer(longPressGesture)

【讨论】：

如您所说，它不适用于 swift 3.0。它仍然指向 swift
对我来说在 Swift 3 中完美运行。

【解决方案4】：

Swift 4

let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(longPressed(sender:)))
self.view.addGestureRecognizer(longPressRecognizer)

// MARK：动作

@objc func longPressed(sender: UILongPressGestureRecognizer) {

    if sender.state == UIGestureRecognizerState.began {

        let touchPoint = sender.location(in: self.tableView)
        if let indexPath = tableView.indexPathForRow(at: touchPoint) {

            print("Long pressed row: \(indexPath.row)")
        }
    }
}

【讨论】：

sender.location(in: self.tableView) // 正确

【解决方案5】：

适用于 swift 版本 3

func longPress(_ longPressGestureRecognizer: UILongPressGestureRecognizer) {
    if longPressGestureRecognizer.state == UIGestureRecognizerState.began {
        let touchPoint = longPressGestureRecognizer.location(in: self.view)
        if let indexPath = notificationTabelView.indexPathForRow(at: touchPoint) {
            print("indexPath=\(indexPath)")
            // your code here, get the row for the indexPath or do whatever you want
        }
    }
}

在您的viewDidLoad 函数中

let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(EmployeeNotificationViewController.longPress(_:)))
    longPressGesture.minimumPressDuration = 1.0 // 1 second press
    longPressGesture.delegate = self as? UIGestureRecognizerDelegate
    self.notificationTabelView.addGestureRecognizer(longPressGesture)

【讨论】：

【解决方案6】：

为避免这种情况，您可以在cellForRowAtIndexPath 中添加UILongPressGestureRecognizer 而不是didSelectRowAtIndexPath

【讨论】：

【解决方案7】：

使用 IBAction 你可以做（对于 CollectionView）：

@IBAction func handleLongPress(sender: AnyObject) {

    if sender.state == UIGestureRecognizerState.Began
    {
        let position = sender.locationInView(sender.view)

        if let indexPath : NSIndexPath = ((sender.view as! UICollectionView).indexPathForItemAtPoint(position))!{
            print("You holding cell #\(indexPath.item)!")
        }
    }
}

记得链接你的长按手势识别器。

【讨论】：

【解决方案8】：

let longPressGesture = UILongPressGestureRecognizer(target: self, action: (#selector(YourCustomeTableCell.longTap)))
self.addGestureRecognizer(longPressGesture)

func longTap(){
    print("Long tap")
}

【讨论】：

【解决方案9】：

斯威夫特 5

像这样在viewDidLoad() 中声明这一行

override func viewDidLoad() {
        super.viewDidLoad()
//do other stuff here
        
        // long press listener for tableview
        let longPress = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(sender:)))
        tableView.addGestureRecognizer(longPress)
        
    }

handleLongPress() 方法在哪里

 @objc private func handleLongPress(sender: UILongPressGestureRecognizer) {
        if sender.state == .began {
            let touchPoint = sender.location(in: tableView)
            if let indexPath = tableView.indexPathForRow(at: touchPoint) {
                let alert = UIAlertController(title: "Alert", message: "Do you want to delete this item?", preferredStyle: .alert)
                
                let action = UIAlertAction(title: "Yes", style: .default) { (action) in
                    // do your functionality

                    alert.dismiss(animated: true, completion: nil)
                    
                }
                let actionDelete = UIAlertAction(title: "No", style: .default) { (action) in
                    // do your functionality
                    alert.dismiss(animated: true, completion: nil)
                    
                }

                alert.addAction(action)
                alert.addAction(actionDelete)
                self.present(alert, animated: true, completion: nil)
                // your code here, get the row for the indexPath or do whatever you want
            }
        }
    }

【讨论】：