带有手势识别器的UICollectionView

Question

I have a UICollectionView which has a long press gesture attached to it. It works fine when i'm pressing on a cell but if the touched area isn't a cell the app crashes with EXC_BREAKPOINT

It crashes on the

if let indexPath : NSIndexPath = collectView.indexPathForItemAtPoint(point)! { 

line. I believe that i need to check that the point is actually a cell but i'm not sure what to check for

the code is as follows

@IBAction func longPressCell(sender: UILongPressGestureRecognizer) {
    if (sender.state == UIGestureRecognizerState.Began) {
        if let point : CGPoint = sender.locationInView(self.collectionView) {
            if let collectView = self.collectionView {
                if let indexPath : NSIndexPath = collectView.indexPathForItemAtPoint(point)! {
                    let adopt : UserPet = self.fetchedResultsController.objectAtIndexPath(indexPath) as! UserPet
                    NSLog("Adopt: \(adopt)")
                }
            }
        }

    }
}

Answer 1

collectView.indexPathForItemAtPoint（point）！= nil {已解决