Why UICollectionView didSelect method does not work?

Question

I've created my UICollectionView programmatically and in this case my didSelectItemAtIndexPath method does not call at all.

let collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: CGRectGetWidth(self.view.frame), height: 360), collectionViewLayout: layout)
collectionView.delegate = self
collectionView.dataSource = self
collectionView.userInteractionEnabled = true

So, what is a problem? Why when I tap on the cells I do not get my response?

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    print("Selected Cell: \(indexPath.row)")
}

Answer 1

我知道这可能会迟到，但出于功能目的， CollectionView[didSelectItem]没有响应触摸可能是因为您还启用了addGestureRecognizer因此请检查您是否在CollectionView上设置了手势识别器，例如collectionView?.addGestureRecognizer(tapGestRecognizer)

Answer 2

I just encountered this case.

Did you put a button or an interactive view in a collection view cell? Your touch is handled by it, then didSelect isn't called.

Turn off User Interaction Enabled property by Interface builder, or set false programmatically.

Answer 3

Select ViewController.swift in Project Navigator. Update the class declaration with this:

class ViewController: UIViewController, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource 


//After class declaration create a new variable:

 var collectionView: UICollectionView!



  override func viewDidLoad() {
   super.viewDidLoad()
     // Do any additional setup after loading the view, typically from a nib.
   let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
   layout.sectionInset = UIEdgeInsets(top: 20, left: 10, bottom: 10, right: 10)
   layout.itemSize = CGSize(width: 90, height: 120)

   collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
   collectionView.dataSource = self
   collectionView.delegate = self
   collectionView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
   collectionView.backgroundColor = UIColor.whiteColor()
   self.view.addSubview(collectionView)
}



func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    print("Selected Cell: \(indexPath.row)")
}

Answer 4

检查UiCollectionviewCell子类isUserInteractionEnabled属性或将其编程设置为 true

self.contentView.isUserInteractionEnabled = true

Answer 5

确保您没有将 UICollectionViewDelegate 和 UICollectionViewDelegateFlowLayout 放在一起。

Answer 6

I discovered a strange edge case where I had accidentally specified a class for the cell's container view (and a class that was not valid for the container view), and everything looked fine, I did not receive any warnings, but didSelectItemAt would not be called.

That's 5 hours of my life I would like back.

Answer 7

In my case, I was implementing hitTest in UICollectionView's parent view to intercept hit event, so didSelectItemAt did not call.

override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    let p = convert(point, to: v)
    if v.point(inside: p, with: event) {
        return v.hitTest(p, with: event)
    }
    return super.hitTest(point, with: event)
}

Answer 8

I had the same problem, you should make sure you didn't using tapGestureRecognizer on your view in the background of collectionView .