ios - 从特定 UITableViewCell 启动相机后更新特定 UITableViewCell 上的图像

Question

我有一个UITableView，每个单元格都包含一个UIImageView 和一个UIButton。点击按钮后我启动相机，我正在尝试更新该单元格索引路径中的 UIImageView 。到目前为止，这是我尝试过的方法，但图像没有更新:

import UIKit

class ViewController: UIViewController, UITableViewDelegate, 
UITableViewDataSource, UIImagePickerControllerDelegate, 
UINavigationControllerDelegate {

var objects = ["cup", "phone", "shoe", "tv"]
var images = [UIImage?](repeating:nil, count: 4)
var imageTaken : UIImage!
var imagePicker : UIImagePickerController?
@IBOutlet weak var tableView: UITableView!

@IBAction func TakePhoto(_ sender: UIButton) {
    imagePicker!.sourceType = .camera
    present(imagePicker!, animated: true, completion: nil)
    images[sender.tag] = imageTaken
    self.tableView.reloadData()

}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return objects.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = Bundle.main.loadNibNamed("CustomTableViewCell", owner: self, options: nil)?.first as! CustomTableViewCell

    cell.buttonOutlet.tag = indexPath.row

    cell.buttonOutlet.addTarget(self, action: #selector(ViewController.TakePhoto(_:)), for: .touchUpInside)

    cell.imageFound.image = images[indexPath.row]

    return cell
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {

        self.imageTaken = pickedImage

    }
    dismiss(animated: true, completion: nil)

}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    dismiss(animated: true, completion: nil)
} 
override func viewDidLoad() {
    super.viewDidLoad()

    imagePicker = UIImagePickerController()
    imagePicker?.delegate = self
}

Answer 1

不是将 self.imageTaken 定义为 UIImage，而是需要在 UIImagePickerController 出现时保持对 indexPath.row 的引用，并且在 didFinishPickingMediaWithInfo 方法然后根据 indexPath.row

将图像传递到图像数组中

像这样

import UIKit

class ViewController: UIViewController, UITableViewDelegate, 
UITableViewDataSource, UIImagePickerControllerDelegate, 
UINavigationControllerDelegate {

var objects = ["cup", "phone", "shoe", "tv"]
var images = [UIImage?](repeating:nil, count: 4)
var currentRow : Int = -1
var imagePicker : UIImagePickerController?
@IBOutlet weak var tableView: UITableView!

@IBAction func TakePhoto(_ sender: UIButton) {
    imagePicker!.sourceType = .camera
    self.currentRow = sender.tag
    present(imagePicker!, animated: true, completion: nil)
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return objects.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = Bundle.main.loadNibNamed("CustomTableViewCell", owner: self, options: nil)?.first as! CustomTableViewCell

    cell.buttonOutlet.tag = indexPath.row

    cell.buttonOutlet.addTarget(self, action: #selector(ViewController.TakePhoto(_:)), for: .touchUpInside)

    cell.imageFound.image = images[indexPath.row]

    return cell
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
        guard self.currentRow != -1 else{ 
            return
        }

        images[self.currentRow] = pickedImage
        self.currentRow = -1
        self.tableView.reloadData()
    }
    dismiss(animated: true, completion: nil)

}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    dismiss(animated: true, completion: nil)
} 
override func viewDidLoad() {
    super.viewDidLoad()

    imagePicker = UIImagePickerController()
    imagePicker?.delegate = self
}
}