ios 如何在 Swift 中长按时选择表格行
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How To select a table row during a long press in Swift
提问by LB79
I have a table which has a long press gesture recogniser that runs code depending on what table row is selected.
我有一个表，它有一个长按手势识别器，它根据选择的表行运行代码。
The trouble I'm having is that I currently have to tap the row I want then do the long press.
我遇到的麻烦是我目前必须点击我想要的行然后长按。
How can I make the table select the row that I am long pressing without having to tap to select it first?
如何让表格选择我长按的行而不必先点击选择它？
回答by user3687284
The following code works fine for me:
以下代码对我来说很好用：
Add a long press gesture recognizer in viewDidLoad:
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)
Then the method invoke by the long press looks like this:
然后长按调用的方法如下所示：
//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
}
}
回答by PinkeshGjr
Swift 4
斯威夫特 4
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) {
}
}
}
Swift 3
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
}
}
}
Objective - C
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
}
}
}
回答by Kulker22
Swift 3 function:
斯威夫特 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:
视图加载：
let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(YourViewController.handleLongPress(_:)))
longPressGesture.minimumPressDuration = 1.0 // 1 second press
longPressGesture.delegate = self
self.tableView.addGestureRecognizer(longPressGesture)
更多：https: //github.com/apple/swift-evolution/blob/e4328889a9643100177aef19f6f428855c5d0cf2/proposals/0046-first-label.md
回答by Sazzad Hissain Khan
Swift 4
斯威夫特 4
let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(longPressed(sender:)))
self.view.addGestureRecognizer(longPressRecognizer)
// MARK: Actions
// 标记：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)")
}
}
}
回答by Pushpendra
For Verision 3 of swift
对于 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
}
}
}
In Your viewDidLoadfunction
在你的viewDidLoad职能中
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)
回答by Shamsudheen TK
To avoid this, you can add the UILongPressGestureRecognizerinside the cellForRowAtIndexPathinstead of didSelectRowAtIndexPath
为避免这种情况，您可以添加UILongPressGestureRecognizer内部cellForRowAtIndexPath而不是didSelectRowAtIndexPath
回答by Javier Vazquez
Using IBAction you can do (for a CollectionView):
使用 IBAction，您可以执行以下操作（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)!")
}
}
}
Remember to link with your Long Press Gesture Recognizer.
请记住与您的长按手势识别器链接。
回答by Chandramani
let longPressGesture = UILongPressGestureRecognizer(target: self, action: (#selector(YourCustomeTableCell.longTap)))
self.addGestureRecognizer(longPressGesture)
func longTap(){
print("Long tap")
}
