ios - 在 Swift 中使用 UITapGestureRecognizer 的参数

Question

我正在尝试使用 UITapGestureRecognizer 的操作调用带参数的函数，但我想不出任何替代方法。

这是假设使用 indexPath 参数调用 doubleTap 函数的手势。

var gestureDoubleTap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "doubleTap(indexPath)")

这是假设要调用的函数。

func doubleTap(indexPath: NSIndexPath) {
    NSLog("double tap")
    NSLog("%@", indexPath.row)
}

如何使用 indexPath 参数调用 doubleTap 函数？

感谢您的所有建议。

编辑 - 这是我的全部代码，它基本上是设置对象“名称”，以便我的第二个 viewController 可以获取并使用它

import UIKit
class viewController1: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {

    @IBOutlet weak var collectionView: UICollectionView!
    var imageArray:[String] = []
    var name : AnyObject? {
        get {
        return NSUserDefaults.standardUserDefaults().objectForKey("name")
        }
        set {
            NSUserDefaults.standardUserDefaults().setObject(newValue!, forKey: "name")
            NSUserDefaults.standardUserDefaults().synchronize()
        }
    }

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return imageArray.count
    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        var cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as myViewCell

        //adding single and double tap gestures for each cell
        /////////////////////////////
        //ISSUE IS SENDING indexPath TO doubleTap FUNC
        var gestureDoubleTap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "doubleTap:")
        gestureDoubleTap.numberOfTapsRequired = 2
        cell.addGestureRecognizer(gestureDoubleTap)

        var gestureSingleTap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "singleTap")
        gestureSingleTap.numberOfTapsRequired = 1
        cell.addGestureRecognizer(gestureSingleTap)

        cell.imgView.image=UIImage(named: imageArray[indexPath.row])        
        return cell
    }

    //func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath){
    //
    //    name = imageArray[indexPath.row]
    //}

    override func viewDidLoad(){
        super.viewDidLoad()
        imageArray=["1.png","2.png","2.png","1.png","1.png","2.png","1.png","2.png","1.png","2.png","1.png","2.png","1.png","2.png","1.png","2.png"]

    }

    func doubleTap(sender: UITapGestureRecognizer) {
        var tapLocation = sender.locationInView(self.collectionView)

        var indexPath:NSIndexPath = self.collectionView.indexPathForItemAtPoint(tapLocation)!

        //var cell = self.collectionView.cellForItemAtIndexPath(indexPath)

        NSLog("double tap")
        NSLog("%@", indexPath)

        //NSLog("%@", cell!)
        //THIS IS THE GOAL----- set 'name' with the appropriate img      corresponding the cell
        //name = imageArray[indexPath]
        //self.performSegueWithIdentifier("segue", sender: nil)
    }

    func singleTap() {
        NSLog("single tap")
    }
}

Answer 1

鉴于您有 NSIndexPath，我想您希望从 UITableView 上的点击触摸点检索相应的 indexPath。

UIGestureRecognizer 有一个(或没有)参数。当提供一个时，它会传递自身 - 但是，indexPath 不会如前所述传递给函数。

假设我们有以下内容:

let aTap = UITapGestureRecognizer(target: self, action: "tapped:")

点击 View 时对应的函数:

func tapped(sender: UITapGestureRecognizer)
{
    //using sender, we can get the point in respect to the table view
    let tapLocation = sender.locationInView(self.tableView)

    //using the tapLocation, we retrieve the corresponding indexPath
    let indexPath = self.tableView.indexPathForRowAtPoint(tapLocation)

    //finally, we print out the value
    print(indexPath)

    //we could even get the cell from the index, too
    let cell = self.tableView.cellForRowAtIndexPath(indexPath!)

    cell.textLabel?.text = "Hello, Cell!"
 }

更新:

这用于显示如何向 View 添加手势识别器，通过它我们检索 cell (item) 的 indexPath被点击了两次。

回调函数被触发，在回调函数中我们可以检查点击的cell(item)是否是我们感兴趣的。

override func viewDidLoad()
{
    super.viewDidLoad()

    let doubleTaps = UITapGestureRecognizer(target: self, action: "doubleTapTriggered:")
    doubleTaps.numberOfTapsRequired = 2
    self.view.addGestureRecognizer(doubleTaps)
}

func doubleTapTriggered(sender : UITapGestureRecognizer)
{
    var tapLocation = sender.locationInView(self.collectionView)
    var indexPath : NSIndexPath = self.collectionView.indexPathForItemAtPoint(tapLocation)!

    if let cell = self.collectionView.cellForItemAtIndexPath(indexPath)
    {
        if(cell.tag == 100)
        {
            print("Hello, I am cell with tag 100")
        }
        else if(cell.tag == 99)
        {
            print("Hello, I am cell with tag 99")
            //We could do something, then, with the cell that we are interested in.
            //I.e., cell.contentView.addSubview(....)
        }
    }
}

另一个更新:

因为您似乎正在添加需要双击所有单元格的手势识别器，这告诉我您对双击的任何单元格感兴趣；因此，我们不需要任何条件来检查细胞是否是我们感兴趣的细胞，因为它们都是。

所以:

func doubleTapTriggered(sender : UITapGestureRecognizer)
{
    var tapLocation = sender.locationInView(self.collectionView)
    var indexPath : NSIndexPath = self.collectionView.indexPathForItemAtPoint(tapLocation)!

    name = imageArray[indexPath]
    self.performSegueWithIdentifier("segue", sender: nil)
}