Long press gesture on UICollectionViewCell

Question

I was wondering how to add a long press gesture recognizer to a (subclass of) UICollectionView. I read in the documentation that it is added by default, but I can't figure out how.

What I want to do is: Long press on a cell ( I have a calendar thingy from github ), get which cell is tapped and then do stuff with it. I need to know what cell is longpressed. Sorry for this broad question, but i couldn't find anything better on either google or SO

Answer 1

Objective-C

In your myCollectionViewController.h file add the UIGestureRecognizerDelegate protocol

@interface myCollectionViewController : UICollectionViewController<UIGestureRecognizerDelegate> 

in your myCollectionViewController.m file:

- (void)viewDidLoad {     // attach long press gesture to collectionView     UILongPressGestureRecognizer *lpgr         = [[UILongPressGestureRecognizer alloc]                      initWithTarget:self action:@selector(handleLongPress:)];     lpgr.delegate = self;     lpgr.delaysTouchesBegan = YES;     [self.collectionView addGestureRecognizer:lpgr]; }  -(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer {     if (gestureRecognizer.state != UIGestureRecognizerStateEnded) {         return;     }     CGPoint p = [gestureRecognizer locationInView:self.collectionView];      NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:p];     if (indexPath == nil){         NSLog(@"couldn't find index path");                 } else {         // get the cell at indexPath (the one you long pressed)         UICollectionViewCell* cell =         [self.collectionView cellForItemAtIndexPath:indexPath];         // do stuff with the cell     } } 

Swift

class Some {      @objc func handleLongPress(gesture : UILongPressGestureRecognizer!) {         if gesture.state != .Ended {             return         }         let p = gesture.locationInView(self.collectionView)          if let indexPath = self.collectionView.indexPathForItemAtPoint(p) {             // get the cell at indexPath (the one you long pressed)             let cell = self.collectionView.cellForItemAtIndexPath(indexPath)             // do stuff with the cell         } else {             print("couldn't find index path")         }     } }  let some = Some() let lpgr = UILongPressGestureRecognizer(target: some, action: #selector(Some.handleLongPress)) 

Swift 4

class Some {      @objc func handleLongPress(gesture : UILongPressGestureRecognizer!) {         if gesture.state != .ended {              return          }           let p = gesture.location(in: self.collectionView)           if let indexPath = self.collectionView.indexPathForItem(at: p) {              // get the cell at indexPath (the one you long pressed)              let cell = self.collectionView.cellForItem(at: indexPath)              // do stuff with the cell          } else {              print("couldn't find index path")          }     } }  let some = Some() let lpgr = UILongPressGestureRecognizer(target: some, action: #selector(Some.handleLongPress)) 

Answer 2

The same code @abbood's code for Swift:

In viewDidLoad:

let lpgr : UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: "handleLongPress:") lpgr.minimumPressDuration = 0.5 lpgr.delegate = self lpgr.delaysTouchesBegan = true self.collectionView?.addGestureRecognizer(lpgr) 

And the function:

func handleLongPress(gestureRecognizer : UILongPressGestureRecognizer){      if (gestureRecognizer.state != UIGestureRecognizerState.Ended){         return     }      let p = gestureRecognizer.locationInView(self.collectionView)      if let indexPath : NSIndexPath = (self.collectionView?.indexPathForItemAtPoint(p))!{         //do whatever you need to do     }  } 

Do not forget the delegate UIGestureRecognizerDelegate