我试图使用UITapGestureRecognizer的动作调用一个带参数的函数,我无法找出任何替代方案.
这里是假设用indexPath参数调用doubleTap函数的手势.
var gestureDoubleTap: UITapGestureRecognizer = UITapGestureRecognizer(target: self,action: "doubleTap(indexPath)")
这里是假设被调用的函数.
func doubleTap(indexPath: NSIndexPath) {
NSLog("double tap")
NSLog("%@",indexPath.row)
}
如何使用indexPath参数调用doubleTap函数？
感谢您的建议.
编辑 – 这是我的整个代码,它基本上设置对象’名称’,所以我的第二个viewController可以得到它并使用它
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","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")
}
}
解决方法
假设你有NSIndexPath,我想你想从你的UITableView的点击触摸点检索相应的indexPath.
UIGestureRecognizer有一个(或否)参数.当有一个提供时,它会自动传递 – 但是,indexPath不会传递给所提到的函数.
假设我们有以下几点：
let aTap = UITapGestureRecognizer(target: self,action: "tapped:")
以及当视图被点击时的相应功能：
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：
这用于显示如何在视图中添加手势识别器,通过该视图,我们可以检索分隔了两次的单元格(item)的indexPath.
触发回调函数,我们可以在其中检查被敲击的单元格(项目)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：
由于您似乎正在添加手势识别器,需要对所有单元格进行双击,这告诉我您对任何双击的单元格感兴趣;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)
}