Question

如何使用 firebase 从 collectionCell 获取不同数量的图片到 scrollView ？在我的项目中，我有三个viewController的。

tableView 中的

FirstVC - collectionView 。 CollectionView 需要显示主要图像以便滚动它们。 TableView 需要显示名称和滚动表格。（即对于 collectionCell 中 FirstVC 中的图像）。

SecondVC - 仅 collectionView 。需要显示相册。

ThirdVC - viewController 中仅 scrollView 。 ScrollView 需要位于 firebase 的 images 文件夹中的滚动图片。

所以，当我点击 collectionCell 中的 secondVC 中的相册时，我想在 thirdVC 中看到< strong> scrollView 位于 firebase 中图像文件夹中的图像，用于滚动它们。我的 firebase 结构位于：

{ 
  "users" : {
    "Y7EHcJuqQWZrVI1HBmNgccbPhm55" : {
      "name" : "Photos",
      "posts" : {
        "images" : {
          "image" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/gallery%2F06BAB847-7C94-40A6-A9C8-C3A11B3F9C81.png?alt=media&token=4f797093-fbc7-437b-935c-d13be1409d13",
          "image1" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/gallery%2F06BAB847-7C94-40A6-A9C8-C3A11B3F9C81.png?alt=media&token=4f797093-fbc7-437b-935c-d13be1409d13"
        },
        "qwerty" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/gallery%2F06BAB847-7C94-40A6-A9C8-C3A11B3F9C81.png?alt=media&token=4f797093-fbc7-437b-935c-d13be1409d13"
      },
      "posts2" : {
        "images" : {
          "image" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/gallery%2F06BAB847-7C94-40A6-A9C8-C3A11B3F9C81.png?alt=media&token=4f797093-fbc7-437b-935c-d13be1409d13",
          "image1" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/gallery%2F06BAB847-7C94-40A6-A9C8-C3A11B3F9C81.png?alt=media&token=4f797093-fbc7-437b-935c-d13be1409d13"
        },
        "qwerty" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/city2.jpg?alt=media&token=64509e18-9884-4449-a081-c67393a7d82a"
      },
      "posts3" : {
        "images" : {
          "image" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/gallery%2F06BAB847-7C94-40A6-A9C8-C3A11B3F9C81.png?alt=media&token=4f797093-fbc7-437b-935c-d13be1409d13",
          "image1" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/gallery%2F06BAB847-7C94-40A6-A9C8-C3A11B3F9C81.png?alt=media&token=4f797093-fbc7-437b-935c-d13be1409d13",
          "image2" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/gallery%2F06BAB847-7C94-40A6-A9C8-C3A11B3F9C81.png?alt=media&token=4f797093-fbc7-437b-935c-d13be1409d13"
        },
        "qwerty" : "https://firebasestorage.googleapis.com/v0/b/test2-29e4b.appspot.com/o/oko1.jpg?alt=media&token=fedea2cb-93b1-496c-9392-0b95f4ada7b5"
      }
    }
  }
}

我的项目在 googleDrive ，因为我遇到了在 github 上加载项目的问题。我的项目非常简单，但我无法解决上面写的问题。

projectTestGoogleDrive

我的项目代码：

FirstVC ：

import UIKit
import Firebase
import SDWebImage

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

    @IBOutlet weak var tableView: UITableView!

    var nameArray = [String]()
    var addressArray = [String]()
    var postImage = [String](), postImage2 = [String](), postImage3 = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.delegate = self
        tableView.dataSource = self

        loadName()
        loadImages()

        tableView.allowsSelection = true

    }
    func loadName() {        

        FIRDatabase.database().reference().child("users"). 
        observe(FIRDataEventType.childAdded, with: {(snapshot) in

            let value = snapshot.value! as! NSDictionary
            self.nameArray.append(value["name"] as? String ?? "")
        })
    }
    func loadImages() {

        FIRDatabase.database().reference().child("users").    
        observe(FIRDataEventType.childAdded, with: {(snapshot) in

            let values = snapshot.value! as! NSDictionary
            let posts = values["posts"] as? NSDictionary //[String: AnyObject]
            let posts2 = values["posts2"] as? NSDictionary //[String: AnyObject]
            let posts3 = values["posts3"] as? NSDictionary //[String: AnyObject]

            self.postImage.append(posts?["qwerty"] as? String ?? "")
            self.postImage2.append(posts2?["qwerty"] as? String ?? "")
            self.postImage3.append(posts3?["qwerty"] as? String ?? "")

            self.tableView.reloadData()
        })
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "segue2" {
            if let indexPaths = self.tableView.indexPathForSelectedRow {
                let indexPath = indexPaths as NSIndexPath
                let dvc = segue.destination as! CollectionViewController
                let imagesArray = [self.postImage[indexPath.row],
                                   self.postImage2[indexPath.row],
                                   self.postImage3[indexPath.row]]
                dvc.images = imagesArray.filter({ !($0.isEmpty) })
            }
        }
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
       return nameArray.count
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! TableViewCell

        cell.userNameLabel.text = nameArray[indexPath.row]

        let array = [postImage[indexPath.row],
                     postImage2[indexPath.row],
                     postImage3[indexPath.row]]
        cell.postImageArray = array.filter({ !($0.isEmpty) })
        return cell
    }
}

SecondVC ：

import UIKit
import SDWebImage

class CollectionViewController: UICollectionViewController {

    var images = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "segue3" {
            if let indexPaths = self.collectionView?.indexPathsForSelectedItems {
                let indexPath = indexPaths[0] as NSIndexPath
                let dvc = segue.destination as! ViewControllerScrollView
                dvc.images = [images[indexPath.item]]
            }
        }
    }
    override func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        return images.count
    } 
    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell2

        cell.imageView.sd_setImage(with: URL(string: images[indexPath.item]))
        return cell
    }
}

ThirdVC ：

import UIKit

class ViewControllerScrollView: UIViewController {

    @IBOutlet weak var scrollView: UIScrollView!

    var images = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()

        for i in 0..<images.count {
            let imageView = UIImageView()
            imageView.sd_setImage(with: URL(string: images[i]))
            let xPosition = self.view.frame.width * CGFloat(i)
            imageView.frame = CGRect(x: xPosition, y: 0, width: self.scrollView.frame.width, height: self.scrollView.frame.height)

            scrollView.contentSize.width = scrollView.frame.width * CGFloat(i + 1)
            scrollView.addSubview(imageView)
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

使用firebase从collectionCell获取不同数量的图像

0 个答案: