Swift 3：在CollectionView中選擇時放大圖像

Question

好日子，我只在Objective-C或Swift 2中看到過這個例子，但還沒有在Swift 3中運行過Xcode 8.我的情況是我有一個帶有一套圖像，我希望它們在用戶點擊它們時被放大。這裏是我的代碼：

@IBOutlet weak var collectionView: UICollectionView! 


var images = ["catPic1.jpg", "catPic2.jpg", "catPic3.jpg"] 

override func viewDidLoad() { 
     super.viewDidLoad() 

     // Do any additional setup after loading the view. 

     collectionView.delegate = self 

     collectionView.dataSource = self 

    } // end of view did load 

public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
    { 
     return images.count 
    } 

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

     cell.myImage.image = UIImage(named: images[indexPath.row]) 


     return cell 

    } 

順便說一句，我在另一個迅速類集合視圖單元代碼。下面的代碼：

class CustomCell: UICollectionViewCell { 

    @IBOutlet weak var myImage: UIImageView! 
} 

所有的圖像都顯示正常，我只需要在用戶選擇他們他們以某種方式放大。謝謝。

Answer 1

您可以使用另一種UIImageView來全屏查看圖像

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { 

    let imageView = UIImageView(image: UIImage(named: images[indexPath.row])) 
    imageView.frame = self.view.frame 
    imageView.backgroundColor = .black 
    imageView.contentMode = .top 
    imageView.isUserInteractionEnabled = true 

    let tap = UITapGestureRecognizer(target: self, action: #selector(dismissFullscreenImage)) 
    imageView.addGestureRecognizer(tap) 

    self.view.addSubview(imageView) 
} 

// Use to back from full mode 
func dismissFullscreenImage(_ sender: UITapGestureRecognizer) { 
    sender.view?.removeFromSuperview() 
}