问swift 3和UIImageview案例

EN

import UIKit

var imageViewArray = [UIImage]()
var textArray = [String]()




override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    imageViewArray = [#imageLiteral(resourceName: "a"),#imageLiteral(resourceName: "b"),#imageLiteral(resourceName: "c")]


    textArray = [
        // firststory Starts
        "firststory",

                 // SecondStory starts
                 "Hello",

                 // thirdStors starts
                 "thirdStory"]

}




override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return imageViewArray.count

}


override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as UICollectionViewCell

    // give the objects their IDs

    let imageView = cell.viewWithTag(1) as! UIImageView
    imageView.image = imageViewArray[indexPath.row]


    let textView = cell.viewWithTag(2)  as! UITextView
    textView.isScrollEnabled = false
    textView.text = textArray[indexPath.row]




    let backButton = cell.viewWithTag(3) as! UIButton
    backButton.isHidden = true



    return cell
}


// adding some animation to the cells

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let cell = collectionView.cellForItem(at: indexPath)

    cell?.superview?.bringSubview(toFront: cell!)



    UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: [], animations: ({



        cell?.frame = collectionView.bounds
        collectionView.isScrollEnabled = false

        let textView = cell!.viewWithTag(2)  as! UITextView
        textView.isScrollEnabled = false


        // some codes to help back button to work !
        let backButton = cell!.viewWithTag(3) as! UIButton
        backButton.isHidden = false
        backButton.addTarget(self, action: #selector(CollectionViewController.backbtnAction), for: UIControlEvents.touchUpInside)



    }), completion: nil)



}


// back button

func backbtnAction() {

    let indexPath = collectionView?.indexPathsForSelectedItems
    collectionView?.isScrollEnabled = true
    collectionView?.reloadItems(at: indexPath!)
}