访问从1个视图控制器到另一个图像阵列，添加滑动手势识别器

Question

我有一个具有图像数组的集合视图。当我按下任何图像时，它将在另一个课程中全屏显示该图像。我试图在第二个视图控制器中添加滑动手势识别器，但我不知道如何访问第一个视图控制器中的数组。

这是我显示的图像集合视图

class sowrController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource{ 


    @IBOutlet weak var collectionView: UICollectionView! 

    var albums = [AlbumModel]() 
    let db : DBHelperMo2lfat = DBHelperMo2lfat() 
    var selectedIndex : Int = -1 


    var posts : Post! 

    override func viewDidLoad() { 
     super.viewDidLoad() 



     collectionView.delegate = self 
     collectionView.dataSource = self 
     self.albums.removeAll() 
     self.albums.append(contentsOf: self.db.fetchAllImages()) 
     self.collectionView.reloadData() 
     DataService.ds.REF_POSTS_SOWR.observe(.value, with: { (snapshot) in 

      if let snapshot = snapshot.children.allObjects as? [FIRDataSnapshot] { 
       self.albums.removeAll() 
       for snap in snapshot { 
        print ("SNAP: \(snap)") 

        if let postDict = snap.value as? Dictionary<String, AnyObject>{ 
         let album : AlbumModel = AlbumModel(id: postDict["id"] as! String, name: postDict["image_name"] as! String, path: postDict["image_path"] as! String, url: postDict["image_path"] as! String, localPath: "") 

         if let items = snap.children.allObjects as? [FIRDataSnapshot] { 
          for itemSnap in items { 
           if let albumSnap = itemSnap.value as? Dictionary<String, AnyObject> { 
            album.childAlbums.append(AlbumModel(id: albumSnap["id"] as! String, name: albumSnap["image_name"] as! String, path: albumSnap["image_path"] as! String, url: albumSnap["image_path"] as! String, localPath: "")) 
           } 
          } 
         } 
         self.albums.append(album) 

        } 
       } 
       self.collectionView.reloadData() 
      } 

     }) 

    } 


    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 


     return self.albums.count 

    } 

    func numberOfSections(in collectionView: UICollectionView) -> Int { 
     return 1 
    } 

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 

     if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Constants.BookCellReuseIdentifier, for: indexPath) as? collectionViewCellSowr { 

      let album = albums[indexPath.item] 
      cell.initWithAlbumModel(album: album) 

      return cell 
     }else { 
      return collectionViewCellSowr() 
     } 

    } 

    private struct Constants { 
     static let BookCellReuseIdentifier = "cell" 
    } 

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { 
     self.selectedIndex = indexPath.row 
     self.performSegue(withIdentifier: "showAlbum", sender: self) 
    } 


    override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
    { 
     if segue.identifier == "showAlbum" 
     { 

      let vc = segue.destination as! imageFullScreen 

      vc.images = self.albums[self.selectedIndex] 

     } 
    } 

这是第二个视图控制器，使图像在全屏幕去

class imageFullScreen: UIViewController{ 


    var images : AlbumModel? 
    let db : DBHelperMo2lfat = DBHelperMo2lfat() 

    @IBAction func pictureSwipe(_ sender: Any) { 

    } 

    @IBOutlet weak var caption: UILabel! 
    @IBOutlet weak var imageView: UIImageView! 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     self.caption.text = images?.imageName 
     let url = URL(string: (images?.imagePath)!) 
     self.imageView.sd_setImage(with: url, placeholderImage: nil, options: [.progressiveDownload,.retryFailed]) 
    } 

Answer 1

编辑：

好了，所以这里是创建图像视图作为一个子视图和响应滑动手势集合视图控制器。请确保您的资产文件夹中有两张图像“图像”和“图像-1”。

// 
// CollectionViewController.swift 
// test 
// 
// Created by Yonatan Vainer on 05/08/2017. 
// Copyright © 2017 Sensus Healthcare LLC. All rights reserved. 
// 

import UIKit 

private let reuseIdentifier = "id" 

class CollectionViewController: UICollectionViewController { 

    var imageView = UIImageView(frame: CGRect(x: 0, y: 100, width: 300, height: 300)) 
    var index = 0; 
    let names = ["Image","Image-1"] 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     //For left swipe 
     let left = UISwipeGestureRecognizer(target: self, action: #selector(self.goLeft(_:))) 
     left.direction = .left 
     imageView.addGestureRecognizer(left) 

     //For right swipe 
     let right = UISwipeGestureRecognizer(target: self, action: #selector(self.goRight(_:))) 
     right.direction = .right 
     imageView.addGestureRecognizer(right) 

     imageView.isUserInteractionEnabled = true 

     self.view.addSubview(imageView) 
     self.view.layoutSubviews() 

     // Uncomment the following line to preserve selection between presentations 
     // self.clearsSelectionOnViewWillAppear = false 

     // Register cell classes 


     // Do any additional setup after loading the view. 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    /* 
    // MARK: - Navigation 

    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
     // Get the new view controller using [segue destinationViewController]. 
     // Pass the selected object to the new view controller. 
    } 
    */ 

    // MARK: UICollectionViewDataSource 

    override func numberOfSections(in collectionView: UICollectionView) -> Int { 
     // #warning Incomplete implementation, return the number of sections 
     return 1 
    } 


    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
     // #warning Incomplete implementation, return the number of items 
     return names.count 
    } 

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

     // Configure the cell 
     let nail = UIImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 50)) 
     nail.image = UIImage(named: names[indexPath.row]) 

     cell.backgroundView = nail 
     return cell 
    } 

    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { 
     imageView.image = UIImage(named: names[indexPath.row]) 
     index = indexPath.row 
    } 

    func goLeft(_ gesture: UISwipeGestureRecognizer){ 
     index += 1 
     if index<0{ 
      index = 0 
     } 
     imageView.image = UIImage(named: names[index]) 
    } 

    func goRight(_ gesture: UISwipeGestureRecognizer){ 
     index -= 1 
     if index>1{ 
      index = 1 
     } 
     imageView.image = UIImage(named: names[index]) 
    } 

    // MARK: UICollectionViewDelegate 

    /* 
    // Uncomment this method to specify if the specified item should be highlighted during tracking 
    override func collectionView(_ collectionView: UICollectionView, shouldHighlightItemAt indexPath: IndexPath) -> Bool { 
     return true 
    } 
    */ 

    /* 
    // Uncomment this method to specify if the specified item should be selected 
    override func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool { 
     return true 
    } 
    */ 

    /* 
    // Uncomment these methods to specify if an action menu should be displayed for the specified item, and react to actions performed on the item 
    override func collectionView(_ collectionView: UICollectionView, shouldShowMenuForItemAt indexPath: IndexPath) -> Bool { 
     return false 
    } 

    override func collectionView(_ collectionView: UICollectionView, canPerformAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) -> Bool { 
     return false 
    } 

    override func collectionView(_ collectionView: UICollectionView, performAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) { 

    } 
    */ 

} 

=========================================== =======================

在故事板中，单击您的收藏视图并嵌入导航控制器。 这将添加一个顶部栏和后退按钮。 附加图片。

Answer 2

我不知道第一个视图控制器我完全理解你的问题，因为我不明白数组与手势识别器有什么关系，但是如果你只是想从前一个ViewController访问数组，那么这应该工作如果你有一个导航控制器：

let vcIndex = self.navigationController?.viewControllers.index(where: { (viewController) -> Bool in 

      if let _ = viewController as? sowrController { 
       return true 
      } 
      return false 
}) 

let prevVC = self.navigationController?.viewControllers[vcIndex!] as! sowrController 
let albums:[AlbumModel] = prevVC.albums